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flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Product <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_copilot","context":"product","tag":"link","label":"github_copilot_link_product_navbar"}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">Security</div> Find and fix vulnerabilities </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"actions","context":"product","tag":"link","label":"actions_link_product_navbar"}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-workflow color-fg-subtle mr-3"> <path d="M1 3a2 2 0 0 1 2-2h6.5a2 2 0 0 1 2 2v6.5a2 2 0 0 1-2 2H7v4.063C7 16.355 7.644 17 8.438 17H12.5v-2.5a2 2 0 0 1 2-2H21a2 2 0 0 1 2 2V21a2 2 0 0 1-2 2h-6.5a2 2 0 0 1-2-2v-2.5H8.437A2.939 2.939 0 0 1 5.5 15.562V11.5H3a2 2 0 0 1-2-2Zm2-.5a.5.5 0 0 0-.5.5v6.5a.5.5 0 0 0 .5.5h6.5a.5.5 0 0 0 .5-.5V3a.5.5 0 0 0-.5-.5ZM14.5 14a.5.5 0 0 0-.5.5V21a.5.5 0 0 0 .5.5H21a.5.5 0 0 0 .5-.5v-6.5a.5.5 0 0 0-.5-.5Z"></path> </svg> <div> <div class="color-fg-default h4">Actions</div> Automate any workflow </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"codespaces","context":"product","tag":"link","label":"codespaces_link_product_navbar"}" href="https://github.com/features/codespaces"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-codespaces color-fg-subtle mr-3"> <path d="M3.5 3.75C3.5 2.784 4.284 2 5.25 2h13.5c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 18.75 13H5.25a1.75 1.75 0 0 1-1.75-1.75Zm-2 12c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v4a1.75 1.75 0 0 1-1.75 1.75H3.25a1.75 1.75 0 0 1-1.75-1.75ZM5.25 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h13.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Zm-2 12a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h17.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25Z"></path><path d="M10 17.75a.75.75 0 0 1 .75-.75h6.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1-.75-.75Zm-4 0a.75.75 0 0 1 .75-.75h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path> </svg> <div> <div class="color-fg-default h4">Codespaces</div> Instant dev environments </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"issues","context":"product","tag":"link","label":"issues_link_product_navbar"}" href="https://github.com/features/issues"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-issue-opened color-fg-subtle mr-3"> <path d="M12 1c6.075 0 11 4.925 11 11s-4.925 11-11 11S1 18.075 1 12 5.925 1 12 1ZM2.5 12a9.5 9.5 0 0 0 9.5 9.5 9.5 9.5 0 0 0 9.5-9.5A9.5 9.5 0 0 0 12 2.5 9.5 9.5 0 0 0 2.5 12Zm9.5 2a2 2 0 1 1-.001-3.999A2 2 0 0 1 12 14Z"></path> </svg> <div> <div class="color-fg-default h4">Issues</div> Plan and track work </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"code_review","context":"product","tag":"link","label":"code_review_link_product_navbar"}" href="https://github.com/features/code-review"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-review color-fg-subtle mr-3"> <path d="M10.3 6.74a.75.75 0 0 1-.04 1.06l-2.908 2.7 2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M1.5 4.25c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v12.5a1.75 1.75 0 0 1-1.75 1.75h-9.69l-3.573 3.573A1.458 1.458 0 0 1 5 21.043V18.5H3.25a1.75 1.75 0 0 1-1.75-1.75ZM3.25 4a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h2.5a.75.75 0 0 1 .75.75v3.19l3.72-3.72a.749.749 0 0 1 .53-.22h10a.25.25 0 0 0 .25-.25V4.25a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Review</div> Manage code changes </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"discussions","context":"product","tag":"link","label":"discussions_link_product_navbar"}" href="https://github.com/features/discussions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-comment-discussion color-fg-subtle mr-3"> <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 14.25 14H8.061l-2.574 2.573A1.458 1.458 0 0 1 3 15.543V14H1.75A1.75 1.75 0 0 1 0 12.25v-9.5C0 1.784.784 1 1.75 1ZM1.5 2.75v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25Z"></path><path d="M22.5 8.75a.25.25 0 0 0-.25-.25h-3.5a.75.75 0 0 1 0-1.5h3.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 22.25 20H21v1.543a1.457 1.457 0 0 1-2.487 1.03L15.939 20H10.75A1.75 1.75 0 0 1 9 18.25v-1.465a.75.75 0 0 1 1.5 0v1.465c0 .138.112.25.25.25h5.5a.75.75 0 0 1 .53.22l2.72 2.72v-2.19a.75.75 0 0 1 .75-.75h2a.25.25 0 0 0 .25-.25v-9.5Z"></path> </svg> <div> <div class="color-fg-default h4">Discussions</div> Collaborate outside of code </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"code_search","context":"product","tag":"link","label":"code_search_link_product_navbar"}" href="https://github.com/features/code-search"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-square color-fg-subtle mr-3"> <path d="M10.3 8.24a.75.75 0 0 1-.04 1.06L7.352 12l2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M2 3.75C2 2.784 2.784 2 3.75 2h16.5c.966 0 1.75.784 1.75 1.75v16.5A1.75 1.75 0 0 1 20.25 22H3.75A1.75 1.75 0 0 1 2 20.25Zm1.75-.25a.25.25 0 0 0-.25.25v16.5c0 .138.112.25.25.25h16.5a.25.25 0 0 0 .25-.25V3.75a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Search</div> Find more, search less </div> </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="product-explore-heading">Explore</span> <ul class="list-style-none f5" aria-labelledby="product-explore-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"all_features","context":"product","tag":"link","label":"all_features_link_product_navbar"}" href="https://github.com/features"> All features </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative 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6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="e9H9SoAAUJES7hVo6YHI9aWhauBnY4SSOQgxcSRJV0wVQMYefUhcgKQ5erc6e8UvjnmfIfZP1zAe7PEefM6Qhg==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" 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3.297a.196.196 0 0 0 .154 0c2.245-.956 3.582-2.104 4.366-3.298C13.225 9.666 13.5 8.36 13.5 7V3.48a.251.251 0 0 0-.174-.237l-5.25-1.68ZM8.75 4.75v3a.75.75 0 0 1-1.5 0v-3a.75.75 0 0 1 1.5 0ZM9 10.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Security </span> </a> </li> <li hidden="hidden" data-menu-item="i5insights-tab" data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem"> <a tabindex="-1" id="item-c87deb46-4359-4332-ad0c-c4d2af405d8f" href="/css/csso/pulse" role="menuitem" data-view-component="true" class="ActionListContent ActionListContent--visual16"> <span class="ActionListItem-visual ActionListItem-visual--leading"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-graph"> <path d="M1.5 1.75V13.5h13.75a.75.75 0 0 1 0 1.5H.75a.75.75 0 0 1-.75-.75V1.75a.75.75 0 0 1 1.5 0Zm14.28 2.53-5.25 5.25a.75.75 0 0 1-1.06 0L7 7.06 4.28 9.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.25-3.25a.75.75 0 0 1 1.06 0L10 7.94l4.72-4.72a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Insights </span> </a> </li> </ul> </div></action-list> </div> </div></anchored-position> </focus-group> </action-menu></div> </nav> </div> <turbo-frame id="repo-content-turbo-frame" target="_top" data-turbo-action="advance" class=""> <div id="repo-content-pjax-container" class="repository-content " > <h1 class='sr-only'>css/csso</h1> <div class="clearfix container-xl px-md-4 px-lg-5 px-3"> <div> <div style="max-width: 100%" data-view-component="true" class="Layout Layout--flowRow-until-md react-repos-overview-margin Layout--sidebarPosition-end Layout--sidebarPosition-flowRow-end"> <div data-view-component="true" class="Layout-main"> <script crossorigin="anonymous" defer="defer" type="application/javascript" 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data-target="react-partial.embeddedData">{"props":{"initialPayload":{"allShortcutsEnabled":false,"path":"/","repo":{"id":1369824,"defaultBranch":"master","name":"csso","ownerLogin":"css","currentUserCanPush":false,"isFork":false,"isEmpty":false,"createdAt":"2011-02-15T15:31:37.000Z","ownerAvatar":"https://avatars.githubusercontent.com/u/1517864?v=4","public":true,"private":false,"isOrgOwned":true},"currentUser":null,"refInfo":{"name":"master","listCacheKey":"v0:1676478596.346874","canEdit":false,"refType":"branch","currentOid":"221c9a7145721362ae98ef0313cef4f60dbfa65a"},"tree":{"items":[{"name":".gh-pages","path":".gh-pages","contentType":"directory"},{"name":".github/workflows","path":".github/workflows","contentType":"directory","hasSimplifiedPath":true},{"name":"dist","path":"dist","contentType":"directory"},{"name":"docs","path":"docs","contentType":"directory"},{"name":"fixtures","path":"fixtures","contentType":"directory"},{"name":"lib","path":"lib","contentType":"directory"},{"name":"scripts","path":"scripts","contentType":"directory"},{"name":"test","path":"test","contentType":"directory"},{"name":".editorconfig","path":".editorconfig","contentType":"file"},{"name":".eslintrc","path":".eslintrc","contentType":"file"},{"name":".gitattributes","path":".gitattributes","contentType":"file"},{"name":".gitignore","path":".gitignore","contentType":"file"},{"name":"CHANGELOG.md","path":"CHANGELOG.md","contentType":"file"},{"name":"LICENSE","path":"LICENSE","contentType":"file"},{"name":"README.md","path":"README.md","contentType":"file"},{"name":"package-lock.json","path":"package-lock.json","contentType":"file"},{"name":"package.json","path":"package.json","contentType":"file"}],"templateDirectorySuggestionUrl":null,"readme":null,"totalCount":17,"showBranchInfobar":false},"fileTree":null,"fileTreeProcessingTime":null,"foldersToFetch":[],"treeExpanded":false,"symbolsExpanded":false,"isOverview":true,"overview":{"banners":{"shouldRecommendReadme":false,"isPersonalRepo":false,"showUseActionBanner":false,"actionSlug":null,"actionId":null,"showProtectBranchBanner":false,"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_repo","releasePath":"/css/csso/releases/new?marketplace=true","showPublishActionBanner":false},"interactionLimitBanner":null,"showInvitationBanner":false,"inviterName":null,"actionsMigrationBannerInfo":{"releaseTags":[],"showImmutableActionsMigrationBanner":false,"initialMigrationStatus":null}},"codeButton":{"contactPath":"/contact","isEnterprise":false,"local":{"protocolInfo":{"httpAvailable":true,"sshAvailable":null,"httpUrl":"https://github.com/css/csso.git","showCloneWarning":null,"sshUrl":null,"sshCertificatesRequired":null,"sshCertificatesAvailable":null,"ghCliUrl":"gh repo clone css/csso","defaultProtocol":"http","newSshKeyUrl":"/settings/ssh/new","setProtocolPath":"/users/set_protocol"},"platformInfo":{"cloneUrl":"https://desktop.github.com","showVisualStudioCloneButton":false,"visualStudioCloneUrl":"https://windows.github.com","showXcodeCloneButton":false,"xcodeCloneUrl":"xcode://clone?repo=https%3A%2F%2Fgithub.com%2Fcss%2Fcsso","zipballUrl":"/css/csso/archive/refs/heads/master.zip"}},"newCodespacePath":"/codespaces/new?hide_repo_select=true\u0026repo=1369824"},"popovers":{"rename":null,"renamedParentRepo":null},"commitCount":"1,088","overviewFiles":[{"displayName":"README.md","repoName":"csso","refName":"master","path":"README.md","preferredFileType":"readme","tabName":"README","richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cp dir=\"auto\"\u003e\u003ca href=\"https://www.npmjs.com/package/csso\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/b8d7df8cf58d1db24785f48f3aa6f8dfb787f157ee09814aeb5ab80fe130a28f/68747470733a2f2f696d672e736869656c64732e696f2f6e706d2f762f6373736f2e737667\" alt=\"NPM version\" data-canonical-src=\"https://img.shields.io/npm/v/csso.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://github.com/css/csso/actions/workflows/build.yml\"\u003e\u003cimg src=\"https://github.com/css/csso/actions/workflows/build.yml/badge.svg\" alt=\"Build Status\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://coveralls.io/github/css/csso?branch=master\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/ec9ff06ff77b029a68f1ab36395f0b0f86dcc8e31e10f03ee5827ea761a1ae61/68747470733a2f2f636f766572616c6c732e696f2f7265706f732f6769746875622f6373732f6373736f2f62616467652e7376673f6272616e63683d6d6173746572\" alt=\"Coverage Status\" data-canonical-src=\"https://coveralls.io/repos/github/css/csso/badge.svg?branch=master\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://www.npmjs.com/package/csso\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/23a3c73c5256b3a311ed2306e2775e165a95ffdd22b6c289e7705d7c1dbf929b/68747470733a2f2f696d672e736869656c64732e696f2f6e706d2f646d2f6373736f2e737667\" alt=\"NPM Downloads\" data-canonical-src=\"https://img.shields.io/npm/dm/csso.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003ca href=\"https://twitter.com/cssoptimizer\" rel=\"nofollow\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/6cb03329c3aeaf25f9aa987463cbfd9f7acc829cfcba14cfa29a78ab12211503/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f547769747465722d406373736f7074696d697a65722d626c75652e737667\" alt=\"Twitter\" data-canonical-src=\"https://img.shields.io/badge/Twitter-@cssoptimizer-blue.svg\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCSSO (CSS Optimizer) is a CSS minifier. It performs three sort of transformations: cleaning (removing redundants), compression (replacement for the shorter forms) and restructuring (merge of declarations, rules and so on). As a result an output CSS becomes much smaller in size.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInstall\u003c/h2\u003e\u003ca id=\"user-content-install\" class=\"anchor\" aria-label=\"Permalink: Install\" href=\"#install\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"npm install csso\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003enpm install csso\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsage\u003c/h2\u003e\u003ca id=\"user-content-usage\" class=\"anchor\" aria-label=\"Permalink: Usage\" href=\"#usage\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import { minify } from 'csso';\n// CommonJS is also supported\n// const { minify } = require('csso');\n\nconst minifiedCss = minify('.test { color: #ff0000; }').css;\n\nconsole.log(minifiedCss);\n// .test{color:red}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eminify\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'csso'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// CommonJS is also supported\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// const { minify } = require('csso');\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eminifiedCss\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eminify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.test { color: #ff0000; }'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ecss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eminifiedCss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// .test{color:red}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBundles are also available for use in a browser:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003edist/csso.js\u003c/code\u003e – minified IIFE with \u003ccode\u003ecsso\u003c/code\u003e as global\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;script src=\u0026quot;node_modules/csso/dist/csso.js\u0026quot;\u0026gt;\u0026lt;/script\u0026gt;\n\u0026lt;script\u0026gt;\n csso.minify('.example { color: green }');\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003enode_modules/csso/dist/csso.js\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eminify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.example { color: green }'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003edist/csso.esm.js\u003c/code\u003e – minified ES module\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;script type=\u0026quot;module\u0026quot;\u0026gt;\n import { minify } from 'node_modules/csso/dist/csso.esm.js'\n\n minify('.example { color: green }');\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003emodule\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eminify\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'node_modules/csso/dist/csso.esm.js'\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eminify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.example { color: green }'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOne of CDN services like \u003ccode\u003eunpkg\u003c/code\u003e or \u003ccode\u003ejsDelivr\u003c/code\u003e can be used. By default (for short path) a ESM version is exposing. For IIFE version a full path to a bundle should be specified:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;!-- ESM --\u0026gt;\n\u0026lt;script type=\u0026quot;module\u0026quot;\u0026gt;\n import * as csstree from 'https://cdn.jsdelivr.net/npm/csso';\n import * as csstree from 'https://unpkg.com/csso';\n\u0026lt;/script\u0026gt;\n\n\u0026lt;!-- IIFE with an export to global --\u0026gt;\n\u0026lt;script src=\u0026quot;https://cdn.jsdelivr.net/npm/csso/dist/csso.js\u0026quot;\u0026gt;\u0026lt;/script\u0026gt;\n\u0026lt;script src=\u0026quot;https://unpkg.com/csso/dist/csso.js\u0026quot;\u0026gt;\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e\u0026lt;!-- ESM --\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003emodule\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsstree\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://cdn.jsdelivr.net/npm/csso'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsstree\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://unpkg.com/csso'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e\u0026lt;!-- IIFE with an export to global --\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003ehttps://cdn.jsdelivr.net/npm/csso/dist/csso.js\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003ehttps://unpkg.com/csso/dist/csso.js\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCSSO is based on \u003ca href=\"https://github.com/csstree/csstree\"\u003eCSSTree\u003c/a\u003e to parse CSS into AST, AST traversal and to generate AST back to CSS. All \u003ccode\u003eCSSTree\u003c/code\u003e API is available behind \u003ccode\u003esyntax\u003c/code\u003e field extended with \u003ccode\u003ecompress()\u003c/code\u003e method. You may minify CSS step by step:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import { syntax } from 'csso';\n\nconst ast = syntax.parse('.test { color: #ff0000; }');\nconst compressedAst = syntax.compress(ast).ast;\nconst minifiedCss = syntax.generate(compressedAst);\n\nconsole.log(minifiedCss);\n// .test{color:red}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esyntax\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'csso'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003east\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esyntax\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eparse\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.test { color: #ff0000; }'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecompressedAst\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esyntax\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecompress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003east\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003east\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eminifiedCss\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esyntax\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003egenerate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecompressedAst\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eminifiedCss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// .test{color:red}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAlso syntax can be imported using \u003ccode\u003ecsso/syntax\u003c/code\u003e entry point:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import { parse, compress, generate } from 'csso/syntax';\n\nconst ast = parse('.test { color: #ff0000; }');\nconst compressedAst = compress(ast).ast;\nconst minifiedCss = generate(compressedAst);\n\nconsole.log(minifiedCss);\n// .test{color:red}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eparse\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecompress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003egenerate\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'csso/syntax'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003east\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eparse\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.test { color: #ff0000; }'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecompressedAst\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003ecompress\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003east\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003east\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eminifiedCss\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003egenerate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecompressedAst\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eminifiedCss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// .test{color:red}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eWarning: CSSO doesn't guarantee API behind a \u003ccode\u003esyntax\u003c/code\u003e field as well as AST format. Both might be changed with changes in CSSTree. If you rely heavily on \u003ccode\u003esyntax\u003c/code\u003e API, a better option might be to use CSSTree directly.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRelated projects\u003c/h2\u003e\u003ca id=\"user-content-related-projects\" class=\"anchor\" aria-label=\"Permalink: Related projects\" href=\"#related-projects\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"http://css.github.io/csso/csso.html\" rel=\"nofollow\"\u003eWeb interface\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/css/csso-cli\"\u003ecsso-cli\u003c/a\u003e – command line interface\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/ben-eb/gulp-csso\"\u003egulp-csso\u003c/a\u003e – \u003ccode\u003eGulp\u003c/code\u003e plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/t32k/grunt-csso\"\u003egrunt-csso\u003c/a\u003e – \u003ccode\u003eGrunt\u003c/code\u003e plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/sindresorhus/broccoli-csso\"\u003ebroccoli-csso\u003c/a\u003e – \u003ccode\u003eBroccoli\u003c/code\u003e plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/lahmatiy/postcss-csso\"\u003epostcss-csso\u003c/a\u003e – \u003ccode\u003ePostCSS\u003c/code\u003e plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/sandark7/csso-loader\"\u003ecsso-loader\u003c/a\u003e – \u003ccode\u003ewebpack\u003c/code\u003e loader\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/zoobestik/csso-webpack-plugin\"\u003ecsso-webpack-plugin\u003c/a\u003e – \u003ccode\u003ewebpack\u003c/code\u003e plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://marketplace.visualstudio.com/items?itemName=Aneryu.csso\" rel=\"nofollow\"\u003eCSSO Visual Studio Code plugin\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/1000ch/vscode-csso\"\u003evscode-csso\u003c/a\u003e - Visual Studio Code plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/1000ch/atom-csso\"\u003eatom-csso\u003c/a\u003e - Atom plugin\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/1000ch/Sublime-csso\"\u003eSublime-csso\u003c/a\u003e - Sublime plugin\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPI\u003c/h2\u003e\u003ca id=\"user-content-api\" class=\"anchor\" aria-label=\"Permalink: API\" href=\"#api\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#minifysource-options\"\u003eminify(source[, options])\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#minifyblocksource-options\"\u003eminifyBlock(source[, options])\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#syntaxcompressast-options\"\u003esyntax.compress(ast[, options])\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#source-maps\"\u003eSource maps\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#usage-data\"\u003eUsage data\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#white-list-filtering\"\u003eWhite list filtering\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#black-list-filtering\"\u003eBlack list filtering\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#scopes\"\u003eScopes\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eminify(source[, options])\u003c/h3\u003e\u003ca id=\"user-content-minifysource-options\" class=\"anchor\" aria-label=\"Permalink: minify(source[, options])\" href=\"#minifysource-options\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMinify \u003ccode\u003esource\u003c/code\u003e CSS passed as \u003ccode\u003eString\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const result = csso.minify('.test { color: #ff0000; }', {\n restructure: false, // don't change CSS structure, i.e. don't merge declarations, rulesets etc\n debug: true // show additional debug information:\n // true or number from 1 to 3 (greater number - more details)\n});\n\nconsole.log(result.css);\n// \u0026gt; .test{color:red}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eminify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'.test { color: #ff0000; }'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003erestructure\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003efalse\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// don't change CSS structure, i.e. don't merge declarations, rulesets etc\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edebug\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// show additional debug information:\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// true or number from 1 to 3 (greater number - more details)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ecss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// \u0026gt; .test{color:red}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eReturns an object with properties:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ecss \u003ccode\u003eString\u003c/code\u003e – resulting CSS\u003c/li\u003e\n\u003cli\u003emap \u003ccode\u003eObject\u003c/code\u003e – instance of \u003ca href=\"https://github.com/mozilla/source-map#sourcemapgenerator\"\u003e\u003ccode\u003eSourceMapGenerator\u003c/code\u003e\u003c/a\u003e or \u003ccode\u003enull\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eOptions:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003esourceMap\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eBoolean\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003efalse\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eGenerate a source map when \u003ccode\u003etrue\u003c/code\u003e.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003efilename\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eString\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003e'\u0026lt;unknown\u0026gt;'\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFilename of input CSS, uses for source map generation.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003edebug\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eBoolean\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003efalse\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOutput debug information to \u003ccode\u003estderr\u003c/code\u003e.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003ebeforeCompress\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003efunction(ast, options)\u003c/code\u003e or \u003ccode\u003eArray\u0026lt;function(ast, options)\u0026gt;\u003c/code\u003e or \u003ccode\u003enull\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003enull\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCalled right after parse is run.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eafterCompress\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003efunction(compressResult, options)\u003c/code\u003e or \u003ccode\u003eArray\u0026lt;function(compressResult, options)\u0026gt;\u003c/code\u003e or \u003ccode\u003enull\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003enull\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCalled right after \u003ca href=\"#syntaxcompressast-options\"\u003e\u003ccode\u003esyntax.compress()\u003c/code\u003e\u003c/a\u003e is run.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eOther options are the same as for \u003ca href=\"#syntaxcompressast-options\"\u003e\u003ccode\u003esyntax.compress()\u003c/code\u003e\u003c/a\u003e function.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eminifyBlock(source[, options])\u003c/h3\u003e\u003ca id=\"user-content-minifyblocksource-options\" class=\"anchor\" aria-label=\"Permalink: minifyBlock(source[, options])\" href=\"#minifyblocksource-options\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe same as \u003ccode\u003eminify()\u003c/code\u003e but for list of declarations. Usually it's a \u003ccode\u003estyle\u003c/code\u003e attribute value.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const result = csso.minifyBlock('color: rgba(255, 0, 0, 1); color: #ff0000');\n\nconsole.log(result.css);\n// \u0026gt; color:red\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eminifyBlock\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'color: rgba(255, 0, 0, 1); color: #ff0000'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ecss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// \u0026gt; color:red\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003esyntax.compress(ast[, options])\u003c/h3\u003e\u003ca id=\"user-content-syntaxcompressast-options\" class=\"anchor\" aria-label=\"Permalink: syntax.compress(ast[, options])\" href=\"#syntaxcompressast-options\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eDoes the main task – compress an AST. This is CSSO's extension in CSSTree syntax API.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eNOTE: \u003ccode\u003esyntax.compress()\u003c/code\u003e performs AST compression by transforming input AST by default (since AST cloning is expensive and needed in rare cases). Use \u003ccode\u003eclone\u003c/code\u003e option with truthy value in case you want to keep input AST untouched.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eReturns an object with properties:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003east \u003ccode\u003eObject\u003c/code\u003e – resulting AST\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eOptions:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003erestructure\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eBoolean\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003etrue\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDisable or enable a structure optimisations.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eforceMediaMerge\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eBoolean\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003efalse\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEnables merging of \u003ccode\u003e@media\u003c/code\u003e rules with the same media query by splitted by other rules. The optimisation is unsafe in general, but should work fine in most cases. Use it on your own risk.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eclone\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eBoolean\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003efalse\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTransform a copy of input AST if \u003ccode\u003etrue\u003c/code\u003e. Useful in case of AST reuse.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003ecomments\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eString\u003c/code\u003e or \u003ccode\u003eBoolean\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003etrue\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSpecify what comments to leave:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003e'exclamation'\u003c/code\u003e or \u003ccode\u003etrue\u003c/code\u003e – leave all exclamation comments (i.e. \u003ccode\u003e/*! .. */\u003c/code\u003e)\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e'first-exclamation'\u003c/code\u003e – remove every comment except first one\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003efalse\u003c/code\u003e – remove all comments\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eusage\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eObject\u003c/code\u003e or \u003ccode\u003enull\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003enull\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUsage data for advanced optimisations (see \u003ca href=\"#usage-data\"\u003eUsage data\u003c/a\u003e for details)\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003elogger\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eType: \u003ccode\u003eFunction\u003c/code\u003e or \u003ccode\u003enull\u003c/code\u003e\u003cbr\u003e\nDefault: \u003ccode\u003enull\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFunction to track every step of transformation.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSource maps\u003c/h3\u003e\u003ca id=\"user-content-source-maps\" class=\"anchor\" aria-label=\"Permalink: Source maps\" href=\"#source-maps\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo get a source map set \u003ccode\u003etrue\u003c/code\u003e for \u003ccode\u003esourceMap\u003c/code\u003e option. Additianaly \u003ccode\u003efilename\u003c/code\u003e option can be passed to specify source file. When \u003ccode\u003esourceMap\u003c/code\u003e option is \u003ccode\u003etrue\u003c/code\u003e, \u003ccode\u003emap\u003c/code\u003e field of result object will contain a \u003ca href=\"https://github.com/mozilla/source-map#sourcemapgenerator\"\u003e\u003ccode\u003eSourceMapGenerator\u003c/code\u003e\u003c/a\u003e instance. This object can be mixed with another source map or translated to string.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"const csso = require('csso');\nconst css = fs.readFileSync('path/to/my.css', 'utf8');\nconst result = csso.minify(css, {\n filename: 'path/to/my.css', // will be added to source map as reference to source file\n sourceMap: true // generate source map\n});\n\nconsole.log(result);\n// { css: '...minified...', map: SourceMapGenerator {} }\n\nconsole.log(result.map.toString());\n// '{ .. source map content .. }'\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003erequire\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'csso'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecss\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efs\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ereadFileSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'path/to/my.css'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'utf8'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eminify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecss\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003efilename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'path/to/my.css'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// will be added to source map as reference to source file\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003esourceMap\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// generate source map\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// { css: '...minified...', map: SourceMapGenerator {}\u003cspan class=\"pl-smi\"\u003e \u003c/span\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eresult\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003emap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003etoString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e// '{ .. source map content .. }'\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eExample of generating source map with respect of source map from input CSS:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import { SourceMapConsumer } from 'source-map';\nimport * as csso from 'csso';\n\nconst inputFile = 'path/to/my.css';\nconst input = fs.readFileSync(inputFile, 'utf8');\nconst inputMap = input.match(/\\/\\*# sourceMappingURL=(\\S+)\\s*\\*\\/\\s*$/);\nconst output = csso.minify(input, {\n filename: inputFile,\n sourceMap: true\n});\n\n// apply input source map to output\nif (inputMap) {\n output.map.applySourceMap(\n new SourceMapConsumer(inputMap[1]),\n inputFile\n )\n}\n\n// result CSS with source map\nconsole.log(\n output.css +\n '/*# sourceMappingURL=data:application/json;base64,' +\n Buffer.from(output.map.toString()).toString('base64') +\n ' */'\n);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSourceMapConsumer\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'source-map'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eas\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'csso'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einputFile\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'path/to/my.css'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einput\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efs\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ereadFileSync\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einputFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'utf8'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einputMap\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ematch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\u003cspan class=\"pl-c1\"\u003e/\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\/\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\*\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e#\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e \u003c/span\u003e\u003cspan class=\"pl-s\"\u003es\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eo\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eu\u003c/span\u003e\u003cspan class=\"pl-s\"\u003er\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ec\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ee\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eM\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ea\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ep\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ep\u003c/span\u003e\u003cspan class=\"pl-s\"\u003ei\u003c/span\u003e\u003cspan class=\"pl-s\"\u003en\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eg\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eU\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eR\u003c/span\u003e\u003cspan class=\"pl-s\"\u003eL\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e=\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\S\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e+\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\s\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\*\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\/\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e\\s\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-cce\"\u003e$\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e/\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eoutput\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ecsso\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eminify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003efilename\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003einputFile\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003esourceMap\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// apply input source map to output\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einputMap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eoutput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003emap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eapplySourceMap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSourceMapConsumer\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003einputMap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003einputFile\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// result CSS with source map\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eoutput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ecss\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e+\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'/*# sourceMappingURL=data:application/json;base64,'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e+\u003c/span\u003e\n \u003cspan class=\"pl-v\"\u003eBuffer\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003efrom\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eoutput\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003emap\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003etoString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003etoString\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'base64'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e+\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e' */'\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsage data\u003c/h3\u003e\u003ca id=\"user-content-usage-data\" class=\"anchor\" aria-label=\"Permalink: Usage data\" href=\"#usage-data\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eCSSO\u003c/code\u003e can use data about how \u003ccode\u003eCSS\u003c/code\u003e is used in a markup for better compression. File with this data (\u003ccode\u003eJSON\u003c/code\u003e) can be set using \u003ccode\u003eusage\u003c/code\u003e option. Usage data may contain following sections:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eblacklist\u003c/code\u003e – a set of black lists (see \u003ca href=\"#black-list-filtering\"\u003eBlack list filtering\u003c/a\u003e)\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003etags\u003c/code\u003e – white list of tags\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eids\u003c/code\u003e – white list of ids\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eclasses\u003c/code\u003e – white list of classes\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003escopes\u003c/code\u003e – groups of classes which never used with classes from other groups on the same element\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eAll sections are optional. Value of \u003ccode\u003etags\u003c/code\u003e, \u003ccode\u003eids\u003c/code\u003e and \u003ccode\u003eclasses\u003c/code\u003e should be an array of a string, value of \u003ccode\u003escopes\u003c/code\u003e should be an array of arrays of strings. Other values are ignoring.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhite list filtering\u003c/h4\u003e\u003ca id=\"user-content-white-list-filtering\" class=\"anchor\" aria-label=\"Permalink: White list filtering\" href=\"#white-list-filtering\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003etags\u003c/code\u003e, \u003ccode\u003eids\u003c/code\u003e and \u003ccode\u003eclasses\u003c/code\u003e are using on clean stage to filter selectors that contain something not in the lists. Selectors are filtering only by those kind of simple selector which white list is specified. For example, if only \u003ccode\u003etags\u003c/code\u003e list is specified then type selectors are checking, and if all type selectors in selector present in list or selector has no any type selector it isn't filter.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eids\u003c/code\u003e and \u003ccode\u003eclasses\u003c/code\u003e are case sensitive, \u003ccode\u003etags\u003c/code\u003e – is not.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eInput CSS:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"* { color: green; }\nul, ol, li { color: blue; }\nUL.foo, span.bar { color: red; }\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ent\"\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e green; }\n\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eli\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e blue; }\n\u003cspan class=\"pl-ent\"\u003eUL\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003efoo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003espan\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ebar\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e red; }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUsage data:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-json notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n \u0026quot;tags\u0026quot;: [\u0026quot;ul\u0026quot;, \u0026quot;LI\u0026quot;]\n}\"\u003e\u003cpre\u003e{\n \u003cspan class=\"pl-ent\"\u003e\"tags\"\u003c/span\u003e: [\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003eul\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003eLI\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e]\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eResulting CSS:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"*{color:green}ul,li{color:blue}ul.foo{color:red}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ent\"\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003egreen}\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003eli\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003eblue}\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003efoo\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003ered}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFiltering performs for nested selectors too. \u003ccode\u003e:not()\u003c/code\u003e pseudos content is ignoring since the result of matching is unpredictable. Example for the same usage data as above:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\":nth-child(2n of ul, ol) { color: red }\n:nth-child(3n + 1 of img) { color: yellow }\n:not(div, ol, ul) { color: green }\n:has(:matches(ul, ol), ul, ol) { color: blue }\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enth-child\u003c/span\u003e(2n of \u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e) { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e red }\n\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enth-child\u003c/span\u003e(3n + 1 of \u003cspan class=\"pl-ent\"\u003eimg\u003c/span\u003e) { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e yellow }\n\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enot\u003c/span\u003e(\u003cspan class=\"pl-ent\"\u003ediv\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e) { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e green }\n\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ehas\u003c/span\u003e(\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ematches\u003c/span\u003e(\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e)\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e) { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e blue }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTurns into:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\":nth-child(2n of ul){color:red}:not(div,ol,ul){color:green}:has(:matches(ul),ul){color:blue}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enth-child\u003c/span\u003e(2n of \u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e){\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003ered}\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003enot\u003c/span\u003e(\u003cspan class=\"pl-ent\"\u003ediv\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e){\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003egreen}\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ehas\u003c/span\u003e(\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ematches\u003c/span\u003e(\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e)\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e){\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003eblue}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBlack list filtering\u003c/h4\u003e\u003ca id=\"user-content-black-list-filtering\" class=\"anchor\" aria-label=\"Permalink: Black list filtering\" href=\"#black-list-filtering\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBlack list filtering performs the same as white list filtering, but filters things that mentioned in the lists. \u003ccode\u003eblacklist\u003c/code\u003e can contain the lists \u003ccode\u003etags\u003c/code\u003e, \u003ccode\u003eids\u003c/code\u003e and \u003ccode\u003eclasses\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBlack list has a higher priority, so when something mentioned in the white list and in the black list then white list occurrence is ignoring. The \u003ccode\u003e:not()\u003c/code\u003e pseudos content ignoring as well.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"* { color: green; }\nul, ol, li { color: blue; }\nUL.foo, li.bar { color: red; }\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ent\"\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e green; }\n\u003cspan class=\"pl-ent\"\u003eul\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eol\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eli\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e blue; }\n\u003cspan class=\"pl-ent\"\u003eUL\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003efoo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-ent\"\u003eli\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ebar\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e red; }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUsage data:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-json notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n \u0026quot;blacklist\u0026quot;: {\n \u0026quot;tags\u0026quot;: [\u0026quot;ul\u0026quot;]\n },\n \u0026quot;tags\u0026quot;: [\u0026quot;ul\u0026quot;, \u0026quot;LI\u0026quot;]\n}\"\u003e\u003cpre\u003e{\n \u003cspan class=\"pl-ent\"\u003e\"blacklist\"\u003c/span\u003e: {\n \u003cspan class=\"pl-ent\"\u003e\"tags\"\u003c/span\u003e: [\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003eul\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e]\n },\n \u003cspan class=\"pl-ent\"\u003e\"tags\"\u003c/span\u003e: [\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003eul\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003eLI\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e]\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eResulting CSS:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"*{color:green}li{color:blue}li.bar{color:red}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ent\"\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003egreen}\u003cspan class=\"pl-ent\"\u003eli\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003eblue}\u003cspan class=\"pl-ent\"\u003eli\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ebar\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003ered}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eScopes\u003c/h4\u003e\u003ca id=\"user-content-scopes\" class=\"anchor\" aria-label=\"Permalink: Scopes\" href=\"#scopes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eScopes is designed for CSS scope isolation solutions such as \u003ca href=\"https://github.com/css-modules/css-modules\"\u003ecss-modules\u003c/a\u003e. Scopes are similar to namespaces and define lists of class names that exclusively used on some markup. This information allows the optimizer to move rules more agressive. Since it assumes selectors from different scopes don't match for the same element. This can improve rule merging.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSuppose we have a file:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\".module1-foo { color: red; }\n.module1-bar { font-size: 1.5em; background: yellow; }\n\n.module2-baz { color: red; }\n.module2-qux { font-size: 1.5em; background: yellow; width: 50px; }\"\u003e\u003cpre\u003e.\u003cspan class=\"pl-c1\"\u003emodule1-foo\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e red; }\n.\u003cspan class=\"pl-c1\"\u003emodule1-bar\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003efont-size\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1.5\u003cspan class=\"pl-smi\"\u003eem\u003c/span\u003e\u003c/span\u003e; \u003cspan class=\"pl-c1\"\u003ebackground\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e yellow; }\n\n.\u003cspan class=\"pl-c1\"\u003emodule2-baz\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e red; }\n.\u003cspan class=\"pl-c1\"\u003emodule2-qux\u003c/span\u003e { \u003cspan class=\"pl-c1\"\u003efont-size\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1.5\u003cspan class=\"pl-smi\"\u003eem\u003c/span\u003e\u003c/span\u003e; \u003cspan class=\"pl-c1\"\u003ebackground\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e yellow; \u003cspan class=\"pl-c1\"\u003ewidth\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e50\u003cspan class=\"pl-smi\"\u003epx\u003c/span\u003e\u003c/span\u003e; }\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt can be assumed that first two rules are never used with the second two on the same markup. But we can't say that for sure without a markup review. The optimizer doesn't know it either and will perform safe transformations only. The result will be the same as input but with no spaces and some semicolons:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\".module1-foo{color:red}.module1-bar{font-size:1.5em;background:#ff0}.module2-baz{color:red}.module2-qux{font-size:1.5em;background:#ff0;width:50px}\"\u003e\u003cpre\u003e.\u003cspan class=\"pl-c1\"\u003emodule1-foo\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003ered}.\u003cspan class=\"pl-c1\"\u003emodule1-bar\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003efont-size\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e1.5\u003cspan class=\"pl-smi\"\u003eem\u003c/span\u003e\u003c/span\u003e;\u003cspan class=\"pl-c1\"\u003ebackground\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\u003cspan class=\"pl-kos\"\u003e#\u003c/span\u003eff0\u003c/span\u003e}.\u003cspan class=\"pl-c1\"\u003emodule2-baz\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003ered}.\u003cspan class=\"pl-c1\"\u003emodule2-qux\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003efont-size\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e1.5\u003cspan class=\"pl-smi\"\u003eem\u003c/span\u003e\u003c/span\u003e;\u003cspan class=\"pl-c1\"\u003ebackground\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\u003cspan class=\"pl-kos\"\u003e#\u003c/span\u003eff0\u003c/span\u003e;\u003cspan class=\"pl-c1\"\u003ewidth\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e50\u003cspan class=\"pl-smi\"\u003epx\u003c/span\u003e\u003c/span\u003e}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWith usage data \u003ccode\u003eCSSO\u003c/code\u003e can produce better output. If follow usage data is provided:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-json notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{\n \u0026quot;scopes\u0026quot;: [\n [\u0026quot;module1-foo\u0026quot;, \u0026quot;module1-bar\u0026quot;],\n [\u0026quot;module2-baz\u0026quot;, \u0026quot;module2-qux\u0026quot;]\n ]\n}\"\u003e\u003cpre\u003e{\n \u003cspan class=\"pl-ent\"\u003e\"scopes\"\u003c/span\u003e: [\n [\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003emodule1-foo\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003emodule1-bar\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e],\n [\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003emodule2-baz\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003emodule2-qux\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e]\n ]\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe result will be (29 bytes extra saving):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-css notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\".module1-foo,.module2-baz{color:red}.module1-bar,.module2-qux{font-size:1.5em;background:#ff0}.module2-qux{width:50px}\"\u003e\u003cpre\u003e.\u003cspan class=\"pl-c1\"\u003emodule1-foo\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003emodule2-baz\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ecolor\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003ered}.\u003cspan class=\"pl-c1\"\u003emodule1-bar\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003emodule2-qux\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003efont-size\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e1.5\u003cspan class=\"pl-smi\"\u003eem\u003c/span\u003e\u003c/span\u003e;\u003cspan class=\"pl-c1\"\u003ebackground\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\u003cspan class=\"pl-kos\"\u003e#\u003c/span\u003eff0\u003c/span\u003e}.\u003cspan class=\"pl-c1\"\u003emodule2-qux\u003c/span\u003e{\u003cspan class=\"pl-c1\"\u003ewidth\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e50\u003cspan class=\"pl-smi\"\u003epx\u003c/span\u003e\u003c/span\u003e}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf class name isn't mentioned in the \u003ccode\u003escopes\u003c/code\u003e it belongs to default scope. \u003ccode\u003escopes\u003c/code\u003e data doesn't affect \u003ccode\u003eclasses\u003c/code\u003e whitelist. If class name mentioned in \u003ccode\u003escopes\u003c/code\u003e but missed in \u003ccode\u003eclasses\u003c/code\u003e (both sections are specified) it will be filtered.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that class name can't be set for several scopes. Also a selector can't have class names from different scopes. In both cases an exception will thrown.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCurrently the optimizer doesn't care about changing order safety for out-of-bounds selectors (i.e. selectors that match to elements without class name, e.g. \u003ccode\u003e.scope div\u003c/code\u003e or \u003ccode\u003e.scope ~ :last-child\u003c/code\u003e). It assumes that scoped CSS modules doesn't relay on it's order. It may be fix in future if to be an issue.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":2,"text":"Install","anchor":"install","htmlText":"Install"},{"level":2,"text":"Usage","anchor":"usage","htmlText":"Usage"},{"level":2,"text":"Related projects","anchor":"related-projects","htmlText":"Related projects"},{"level":2,"text":"API","anchor":"api","htmlText":"API"},{"level":3,"text":"minify(source[, options])","anchor":"minifysource-options","htmlText":"minify(source[, options])"},{"level":3,"text":"minifyBlock(source[, options])","anchor":"minifyblocksource-options","htmlText":"minifyBlock(source[, options])"},{"level":3,"text":"syntax.compress(ast[, options])","anchor":"syntaxcompressast-options","htmlText":"syntax.compress(ast[, options])"},{"level":3,"text":"Source maps","anchor":"source-maps","htmlText":"Source maps"},{"level":3,"text":"Usage data","anchor":"usage-data","htmlText":"Usage data"},{"level":4,"text":"White list filtering","anchor":"white-list-filtering","htmlText":"White list filtering"},{"level":4,"text":"Black list filtering","anchor":"black-list-filtering","htmlText":"Black list filtering"},{"level":4,"text":"Scopes","anchor":"scopes","htmlText":"Scopes"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fcss%2Fcsso"}},{"displayName":"LICENSE","repoName":"csso","refName":"master","path":"LICENSE","preferredFileType":"license","tabName":"MIT","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fcss%2Fcsso"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-96e76d5fdb2c.js","githubDevUrl":null,"enabled_features":{"copilot_workspace":null,"code_nav_ui_events":false,"overview_shared_code_dropdown_button":false,"react_blob_overlay":false,"copilot_smell_icebreaker_ux":true,"accessible_code_button":true}}}}</script> <div data-target="react-partial.reactRoot"><style 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href="https://github.com/css/csso/actions/workflows/build.yml"><img src="https://github.com/css/csso/actions/workflows/build.yml/badge.svg" alt="Build Status" style="max-width: 100%;"></a> <a href="https://coveralls.io/github/css/csso?branch=master" rel="nofollow"><img src="https://camo.githubusercontent.com/ec9ff06ff77b029a68f1ab36395f0b0f86dcc8e31e10f03ee5827ea761a1ae61/68747470733a2f2f636f766572616c6c732e696f2f7265706f732f6769746875622f6373732f6373736f2f62616467652e7376673f6272616e63683d6d6173746572" alt="Coverage Status" data-canonical-src="https://coveralls.io/repos/github/css/csso/badge.svg?branch=master" style="max-width: 100%;"></a> <a href="https://www.npmjs.com/package/csso" rel="nofollow"><img src="https://camo.githubusercontent.com/23a3c73c5256b3a311ed2306e2775e165a95ffdd22b6c289e7705d7c1dbf929b/68747470733a2f2f696d672e736869656c64732e696f2f6e706d2f646d2f6373736f2e737667" alt="NPM Downloads" data-canonical-src="https://img.shields.io/npm/dm/csso.svg" style="max-width: 100%;"></a> <a href="https://twitter.com/cssoptimizer" rel="nofollow"><img src="https://camo.githubusercontent.com/6cb03329c3aeaf25f9aa987463cbfd9f7acc829cfcba14cfa29a78ab12211503/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f547769747465722d406373736f7074696d697a65722d626c75652e737667" alt="Twitter" data-canonical-src="https://img.shields.io/badge/Twitter-@cssoptimizer-blue.svg" style="max-width: 100%;"></a></p> <p dir="auto">CSSO (CSS Optimizer) is a CSS minifier. It performs three sort of transformations: cleaning (removing redundants), compression (replacement for the shorter forms) and restructuring (merge of declarations, rules and so on). As a result an output CSS becomes much smaller in size.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Install</h2><a id="user-content-install" class="anchor" aria-label="Permalink: Install" href="#install"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="npm install csso"><pre class="notranslate"><code>npm install csso </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Usage</h2><a id="user-content-usage" class="anchor" aria-label="Permalink: Usage" href="#usage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import { minify } from 'csso'; // CommonJS is also supported // const { minify } = require('csso'); const minifiedCss = minify('.test { color: #ff0000; }').css; console.log(minifiedCss); // .test{color:red}"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">minify</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'csso'</span><span class="pl-kos">;</span> <span class="pl-c">// CommonJS is also supported</span> <span class="pl-c">// const { minify } = require('csso');</span> <span class="pl-k">const</span> <span class="pl-s1">minifiedCss</span> <span class="pl-c1">=</span> <span class="pl-en">minify</span><span class="pl-kos">(</span><span class="pl-s">'.test { color: #ff0000; }'</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-c1">css</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">minifiedCss</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// .test{color:red}</span></pre></div> <p dir="auto">Bundles are also available for use in a browser:</p> <ul dir="auto"> <li><code>dist/csso.js</code> – minified IIFE with <code>csso</code> as global</li> </ul> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<script src="node_modules/csso/dist/csso.js"></script> <script> csso.minify('.example { color: green }'); </script>"><pre><span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">node_modules/csso/dist/csso.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-s1">csso</span><span class="pl-kos">.</span><span class="pl-en">minify</span><span class="pl-kos">(</span><span class="pl-s">'.example { color: green }'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <ul dir="auto"> <li><code>dist/csso.esm.js</code> – minified ES module</li> </ul> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<script type="module"> import { minify } from 'node_modules/csso/dist/csso.esm.js' minify('.example { color: green }'); </script>"><pre><span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">module</span>"<span class="pl-kos">></span> <span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">minify</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'node_modules/csso/dist/csso.esm.js'</span> <span class="pl-en">minify</span><span class="pl-kos">(</span><span class="pl-s">'.example { color: green }'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto">One of CDN services like <code>unpkg</code> or <code>jsDelivr</code> can be used. By default (for short path) a ESM version is exposing. For IIFE version a full path to a bundle should be specified:</p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<!-- ESM --> <script type="module"> import * as csstree from 'https://cdn.jsdelivr.net/npm/csso'; import * as csstree from 'https://unpkg.com/csso'; </script> <!-- IIFE with an export to global --> <script src="https://cdn.jsdelivr.net/npm/csso/dist/csso.js"></script> <script src="https://unpkg.com/csso/dist/csso.js"></script>"><pre><span class="pl-c"><!-- ESM --></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">module</span>"<span class="pl-kos">></span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">csstree</span> <span class="pl-k">from</span> <span class="pl-s">'https://cdn.jsdelivr.net/npm/csso'</span><span class="pl-kos">;</span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">csstree</span> <span class="pl-k">from</span> <span class="pl-s">'https://unpkg.com/csso'</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-c"><!-- IIFE with an export to global --></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">https://cdn.jsdelivr.net/npm/csso/dist/csso.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">https://unpkg.com/csso/dist/csso.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto">CSSO is based on <a href="https://github.com/csstree/csstree">CSSTree</a> to parse CSS into AST, AST traversal and to generate AST back to CSS. All <code>CSSTree</code> API is available behind <code>syntax</code> field extended with <code>compress()</code> method. You may minify CSS step by step:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import { syntax } from 'csso'; const ast = syntax.parse('.test { color: #ff0000; }'); const compressedAst = syntax.compress(ast).ast; const minifiedCss = syntax.generate(compressedAst); console.log(minifiedCss); // .test{color:red}"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">syntax</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'csso'</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">ast</span> <span class="pl-c1">=</span> <span class="pl-s1">syntax</span><span class="pl-kos">.</span><span class="pl-en">parse</span><span class="pl-kos">(</span><span class="pl-s">'.test { color: #ff0000; }'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">compressedAst</span> <span class="pl-c1">=</span> <span class="pl-s1">syntax</span><span class="pl-kos">.</span><span class="pl-en">compress</span><span class="pl-kos">(</span><span class="pl-s1">ast</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-c1">ast</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">minifiedCss</span> <span class="pl-c1">=</span> <span class="pl-s1">syntax</span><span class="pl-kos">.</span><span class="pl-en">generate</span><span class="pl-kos">(</span><span class="pl-s1">compressedAst</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">minifiedCss</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// .test{color:red}</span></pre></div> <p dir="auto">Also syntax can be imported using <code>csso/syntax</code> entry point:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import { parse, compress, generate } from 'csso/syntax'; const ast = parse('.test { color: #ff0000; }'); const compressedAst = compress(ast).ast; const minifiedCss = generate(compressedAst); console.log(minifiedCss); // .test{color:red}"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">parse</span><span class="pl-kos">,</span> <span class="pl-s1">compress</span><span class="pl-kos">,</span> <span class="pl-s1">generate</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'csso/syntax'</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">ast</span> <span class="pl-c1">=</span> <span class="pl-en">parse</span><span class="pl-kos">(</span><span class="pl-s">'.test { color: #ff0000; }'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">compressedAst</span> <span class="pl-c1">=</span> <span class="pl-en">compress</span><span class="pl-kos">(</span><span class="pl-s1">ast</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-c1">ast</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">minifiedCss</span> <span class="pl-c1">=</span> <span class="pl-en">generate</span><span class="pl-kos">(</span><span class="pl-s1">compressedAst</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">minifiedCss</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// .test{color:red}</span></pre></div> <blockquote> <p dir="auto">Warning: CSSO doesn't guarantee API behind a <code>syntax</code> field as well as AST format. Both might be changed with changes in CSSTree. If you rely heavily on <code>syntax</code> API, a better option might be to use CSSTree directly.</p> </blockquote> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Related projects</h2><a id="user-content-related-projects" class="anchor" aria-label="Permalink: Related projects" href="#related-projects"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="http://css.github.io/csso/csso.html" rel="nofollow">Web interface</a></li> <li><a href="https://github.com/css/csso-cli">csso-cli</a> – command line interface</li> <li><a href="https://github.com/ben-eb/gulp-csso">gulp-csso</a> – <code>Gulp</code> plugin</li> <li><a href="https://github.com/t32k/grunt-csso">grunt-csso</a> – <code>Grunt</code> plugin</li> <li><a href="https://github.com/sindresorhus/broccoli-csso">broccoli-csso</a> – <code>Broccoli</code> plugin</li> <li><a href="https://github.com/lahmatiy/postcss-csso">postcss-csso</a> – <code>PostCSS</code> plugin</li> <li><a href="https://github.com/sandark7/csso-loader">csso-loader</a> – <code>webpack</code> loader</li> <li><a href="https://github.com/zoobestik/csso-webpack-plugin">csso-webpack-plugin</a> – <code>webpack</code> plugin</li> <li><a href="https://marketplace.visualstudio.com/items?itemName=Aneryu.csso" rel="nofollow">CSSO Visual Studio Code plugin</a></li> <li><a href="https://github.com/1000ch/vscode-csso">vscode-csso</a> - Visual Studio Code plugin</li> <li><a href="https://github.com/1000ch/atom-csso">atom-csso</a> - Atom plugin</li> <li><a href="https://github.com/1000ch/Sublime-csso">Sublime-csso</a> - Sublime plugin</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">API</h2><a id="user-content-api" class="anchor" aria-label="Permalink: API" href="#api"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="#minifysource-options">minify(source[, options])</a></li> <li><a href="#minifyblocksource-options">minifyBlock(source[, options])</a></li> <li><a href="#syntaxcompressast-options">syntax.compress(ast[, options])</a></li> <li><a href="#source-maps">Source maps</a></li> <li><a href="#usage-data">Usage data</a> <ul dir="auto"> <li><a href="#white-list-filtering">White list filtering</a></li> <li><a href="#black-list-filtering">Black list filtering</a></li> <li><a href="#scopes">Scopes</a></li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">minify(source[, options])</h3><a id="user-content-minifysource-options" class="anchor" aria-label="Permalink: minify(source[, options])" href="#minifysource-options"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Minify <code>source</code> CSS passed as <code>String</code>.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const result = csso.minify('.test { color: #ff0000; }', { restructure: false, // don't change CSS structure, i.e. don't merge declarations, rulesets etc debug: true // show additional debug information: // true or number from 1 to 3 (greater number - more details) }); console.log(result.css); // > .test{color:red}"><pre><span class="pl-k">const</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-s1">csso</span><span class="pl-kos">.</span><span class="pl-en">minify</span><span class="pl-kos">(</span><span class="pl-s">'.test { color: #ff0000; }'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">restructure</span>: <span class="pl-c1">false</span><span class="pl-kos">,</span> <span class="pl-c">// don't change CSS structure, i.e. don't merge declarations, rulesets etc</span> <span class="pl-c1">debug</span>: <span class="pl-c1">true</span> <span class="pl-c">// show additional debug information:</span> <span class="pl-c">// true or number from 1 to 3 (greater number - more details)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">result</span><span class="pl-kos">.</span><span class="pl-c1">css</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// > .test{color:red}</span></pre></div> <p dir="auto">Returns an object with properties:</p> <ul dir="auto"> <li>css <code>String</code> – resulting CSS</li> <li>map <code>Object</code> – instance of <a href="https://github.com/mozilla/source-map#sourcemapgenerator"><code>SourceMapGenerator</code></a> or <code>null</code></li> </ul> <p dir="auto">Options:</p> <ul dir="auto"> <li> <p dir="auto">sourceMap</p> <p dir="auto">Type: <code>Boolean</code><br> Default: <code>false</code></p> <p dir="auto">Generate a source map when <code>true</code>.</p> </li> <li> <p dir="auto">filename</p> <p dir="auto">Type: <code>String</code><br> Default: <code>'<unknown>'</code></p> <p dir="auto">Filename of input CSS, uses for source map generation.</p> </li> <li> <p dir="auto">debug</p> <p dir="auto">Type: <code>Boolean</code><br> Default: <code>false</code></p> <p dir="auto">Output debug information to <code>stderr</code>.</p> </li> <li> <p dir="auto">beforeCompress</p> <p dir="auto">Type: <code>function(ast, options)</code> or <code>Array<function(ast, options)></code> or <code>null</code><br> Default: <code>null</code></p> <p dir="auto">Called right after parse is run.</p> </li> <li> <p dir="auto">afterCompress</p> <p dir="auto">Type: <code>function(compressResult, options)</code> or <code>Array<function(compressResult, options)></code> or <code>null</code><br> Default: <code>null</code></p> <p dir="auto">Called right after <a href="#syntaxcompressast-options"><code>syntax.compress()</code></a> is run.</p> </li> <li> <p dir="auto">Other options are the same as for <a href="#syntaxcompressast-options"><code>syntax.compress()</code></a> function.</p> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">minifyBlock(source[, options])</h3><a id="user-content-minifyblocksource-options" class="anchor" aria-label="Permalink: minifyBlock(source[, options])" href="#minifyblocksource-options"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The same as <code>minify()</code> but for list of declarations. Usually it's a <code>style</code> attribute value.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const result = csso.minifyBlock('color: rgba(255, 0, 0, 1); color: #ff0000'); console.log(result.css); // > color:red"><pre><span class="pl-k">const</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-s1">csso</span><span class="pl-kos">.</span><span class="pl-en">minifyBlock</span><span class="pl-kos">(</span><span class="pl-s">'color: rgba(255, 0, 0, 1); color: #ff0000'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">result</span><span class="pl-kos">.</span><span class="pl-c1">css</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// > color:red</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">syntax.compress(ast[, options])</h3><a id="user-content-syntaxcompressast-options" class="anchor" aria-label="Permalink: syntax.compress(ast[, options])" href="#syntaxcompressast-options"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Does the main task – compress an AST. This is CSSO's extension in CSSTree syntax API.</p> <blockquote> <p dir="auto">NOTE: <code>syntax.compress()</code> performs AST compression by transforming input AST by default (since AST cloning is expensive and needed in rare cases). Use <code>clone</code> option with truthy value in case you want to keep input AST untouched.</p> </blockquote> <p dir="auto">Returns an object with properties:</p> <ul dir="auto"> <li>ast <code>Object</code> – resulting AST</li> </ul> <p dir="auto">Options:</p> <ul dir="auto"> <li> <p dir="auto">restructure</p> <p dir="auto">Type: <code>Boolean</code><br> Default: <code>true</code></p> <p dir="auto">Disable or enable a structure optimisations.</p> </li> <li> <p dir="auto">forceMediaMerge</p> <p dir="auto">Type: <code>Boolean</code><br> Default: <code>false</code></p> <p dir="auto">Enables merging of <code>@media</code> rules with the same media query by splitted by other rules. The optimisation is unsafe in general, but should work fine in most cases. Use it on your own risk.</p> </li> <li> <p dir="auto">clone</p> <p dir="auto">Type: <code>Boolean</code><br> Default: <code>false</code></p> <p dir="auto">Transform a copy of input AST if <code>true</code>. Useful in case of AST reuse.</p> </li> <li> <p dir="auto">comments</p> <p dir="auto">Type: <code>String</code> or <code>Boolean</code><br> Default: <code>true</code></p> <p dir="auto">Specify what comments to leave:</p> <ul dir="auto"> <li><code>'exclamation'</code> or <code>true</code> – leave all exclamation comments (i.e. <code>/*! .. */</code>)</li> <li><code>'first-exclamation'</code> – remove every comment except first one</li> <li><code>false</code> – remove all comments</li> </ul> </li> <li> <p dir="auto">usage</p> <p dir="auto">Type: <code>Object</code> or <code>null</code><br> Default: <code>null</code></p> <p dir="auto">Usage data for advanced optimisations (see <a href="#usage-data">Usage data</a> for details)</p> </li> <li> <p dir="auto">logger</p> <p dir="auto">Type: <code>Function</code> or <code>null</code><br> Default: <code>null</code></p> <p dir="auto">Function to track every step of transformation.</p> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Source maps</h3><a id="user-content-source-maps" class="anchor" aria-label="Permalink: Source maps" href="#source-maps"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To get a source map set <code>true</code> for <code>sourceMap</code> option. Additianaly <code>filename</code> option can be passed to specify source file. When <code>sourceMap</code> option is <code>true</code>, <code>map</code> field of result object will contain a <a href="https://github.com/mozilla/source-map#sourcemapgenerator"><code>SourceMapGenerator</code></a> instance. This object can be mixed with another source map or translated to string.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const csso = require('csso'); const css = fs.readFileSync('path/to/my.css', 'utf8'); const result = csso.minify(css, { filename: 'path/to/my.css', // will be added to source map as reference to source file sourceMap: true // generate source map }); console.log(result); // { css: '...minified...', map: SourceMapGenerator {} } console.log(result.map.toString()); // '{ .. source map content .. }'"><pre><span class="pl-k">const</span> <span class="pl-s1">csso</span> <span class="pl-c1">=</span> <span class="pl-en">require</span><span class="pl-kos">(</span><span class="pl-s">'csso'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">css</span> <span class="pl-c1">=</span> <span class="pl-s1">fs</span><span class="pl-kos">.</span><span class="pl-en">readFileSync</span><span class="pl-kos">(</span><span class="pl-s">'path/to/my.css'</span><span class="pl-kos">,</span> <span class="pl-s">'utf8'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">result</span> <span class="pl-c1">=</span> <span class="pl-s1">csso</span><span class="pl-kos">.</span><span class="pl-en">minify</span><span class="pl-kos">(</span><span class="pl-s1">css</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">filename</span>: <span class="pl-s">'path/to/my.css'</span><span class="pl-kos">,</span> <span class="pl-c">// will be added to source map as reference to source file</span> <span class="pl-c1">sourceMap</span>: <span class="pl-c1">true</span> <span class="pl-c">// generate source map</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">result</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// { css: '...minified...', map: SourceMapGenerator {}<span class="pl-smi"> </span>}</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s1">result</span><span class="pl-kos">.</span><span class="pl-c1">map</span><span class="pl-kos">.</span><span class="pl-en">toString</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// '{ .. source map content .. }'</span></pre></div> <p dir="auto">Example of generating source map with respect of source map from input CSS:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import { SourceMapConsumer } from 'source-map'; import * as csso from 'csso'; const inputFile = 'path/to/my.css'; const input = fs.readFileSync(inputFile, 'utf8'); const inputMap = input.match(/\/\*# sourceMappingURL=(\S+)\s*\*\/\s*$/); const output = csso.minify(input, { filename: inputFile, sourceMap: true }); // apply input source map to output if (inputMap) { output.map.applySourceMap( new SourceMapConsumer(inputMap[1]), inputFile ) } // result CSS with source map console.log( output.css + '/*# sourceMappingURL=data:application/json;base64,' + Buffer.from(output.map.toString()).toString('base64') + ' */' );"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-v">SourceMapConsumer</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'source-map'</span><span class="pl-kos">;</span> <span class="pl-k">import</span> <span class="pl-c1">*</span> <span class="pl-k">as</span> <span class="pl-s1">csso</span> <span class="pl-k">from</span> <span class="pl-s">'csso'</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">inputFile</span> <span class="pl-c1">=</span> <span class="pl-s">'path/to/my.css'</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">input</span> <span class="pl-c1">=</span> <span class="pl-s1">fs</span><span class="pl-kos">.</span><span class="pl-en">readFileSync</span><span class="pl-kos">(</span><span class="pl-s1">inputFile</span><span class="pl-kos">,</span> <span class="pl-s">'utf8'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">inputMap</span> <span class="pl-c1">=</span> <span class="pl-s1">input</span><span class="pl-kos">.</span><span class="pl-en">match</span><span class="pl-kos">(</span><span class="pl-pds"><span class="pl-c1">/</span><span class="pl-cce">\/</span><span class="pl-cce">\*</span><span class="pl-s">#</span><span class="pl-s"> </span><span class="pl-s">s</span><span class="pl-s">o</span><span class="pl-s">u</span><span class="pl-s">r</span><span class="pl-s">c</span><span class="pl-s">e</span><span class="pl-s">M</span><span class="pl-s">a</span><span class="pl-s">p</span><span class="pl-s">p</span><span class="pl-s">i</span><span class="pl-s">n</span><span class="pl-s">g</span><span class="pl-s">U</span><span class="pl-s">R</span><span class="pl-s">L</span><span class="pl-s">=</span><span class="pl-kos">(</span><span class="pl-cce">\S</span><span class="pl-c1">+</span><span class="pl-kos">)</span><span class="pl-cce">\s</span><span class="pl-c1">*</span><span class="pl-cce">\*</span><span class="pl-cce">\/</span><span class="pl-cce">\s</span><span class="pl-c1">*</span><span class="pl-cce">$</span><span class="pl-c1">/</span></span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">output</span> <span class="pl-c1">=</span> <span class="pl-s1">csso</span><span class="pl-kos">.</span><span class="pl-en">minify</span><span class="pl-kos">(</span><span class="pl-s1">input</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">filename</span>: <span class="pl-s1">inputFile</span><span class="pl-kos">,</span> <span class="pl-c1">sourceMap</span>: <span class="pl-c1">true</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// apply input source map to output</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">inputMap</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-s1">output</span><span class="pl-kos">.</span><span class="pl-c1">map</span><span class="pl-kos">.</span><span class="pl-en">applySourceMap</span><span class="pl-kos">(</span> <span class="pl-k">new</span> <span class="pl-v">SourceMapConsumer</span><span class="pl-kos">(</span><span class="pl-s1">inputMap</span><span class="pl-kos">[</span><span class="pl-c1">1</span><span class="pl-kos">]</span><span class="pl-kos">)</span><span class="pl-kos">,</span> <span class="pl-s1">inputFile</span> <span class="pl-kos">)</span> <span class="pl-kos">}</span> <span class="pl-c">// result CSS with source map</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span> <span class="pl-s1">output</span><span class="pl-kos">.</span><span class="pl-c1">css</span> <span class="pl-c1">+</span> <span class="pl-s">'/*# sourceMappingURL=data:application/json;base64,'</span> <span class="pl-c1">+</span> <span class="pl-v">Buffer</span><span class="pl-kos">.</span><span class="pl-en">from</span><span class="pl-kos">(</span><span class="pl-s1">output</span><span class="pl-kos">.</span><span class="pl-c1">map</span><span class="pl-kos">.</span><span class="pl-en">toString</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">toString</span><span class="pl-kos">(</span><span class="pl-s">'base64'</span><span class="pl-kos">)</span> <span class="pl-c1">+</span> <span class="pl-s">' */'</span> <span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Usage data</h3><a id="user-content-usage-data" class="anchor" aria-label="Permalink: Usage data" href="#usage-data"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>CSSO</code> can use data about how <code>CSS</code> is used in a markup for better compression. File with this data (<code>JSON</code>) can be set using <code>usage</code> option. Usage data may contain following sections:</p> <ul dir="auto"> <li><code>blacklist</code> – a set of black lists (see <a href="#black-list-filtering">Black list filtering</a>)</li> <li><code>tags</code> – white list of tags</li> <li><code>ids</code> – white list of ids</li> <li><code>classes</code> – white list of classes</li> <li><code>scopes</code> – groups of classes which never used with classes from other groups on the same element</li> </ul> <p dir="auto">All sections are optional. Value of <code>tags</code>, <code>ids</code> and <code>classes</code> should be an array of a string, value of <code>scopes</code> should be an array of arrays of strings. Other values are ignoring.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">White list filtering</h4><a id="user-content-white-list-filtering" class="anchor" aria-label="Permalink: White list filtering" href="#white-list-filtering"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>tags</code>, <code>ids</code> and <code>classes</code> are using on clean stage to filter selectors that contain something not in the lists. Selectors are filtering only by those kind of simple selector which white list is specified. For example, if only <code>tags</code> list is specified then type selectors are checking, and if all type selectors in selector present in list or selector has no any type selector it isn't filter.</p> <blockquote> <p dir="auto"><code>ids</code> and <code>classes</code> are case sensitive, <code>tags</code> – is not.</p> </blockquote> <p dir="auto">Input CSS:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="* { color: green; } ul, ol, li { color: blue; } UL.foo, span.bar { color: red; }"><pre><span class="pl-ent"><span class="pl-c1">*</span></span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> green; } <span class="pl-ent">ul</span><span class="pl-kos">,</span> <span class="pl-ent">ol</span><span class="pl-kos">,</span> <span class="pl-ent">li</span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> blue; } <span class="pl-ent">UL</span>.<span class="pl-c1">foo</span><span class="pl-kos">,</span> <span class="pl-ent">span</span>.<span class="pl-c1">bar</span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> red; }</pre></div> <p dir="auto">Usage data:</p> <div class="highlight highlight-source-json notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ "tags": ["ul", "LI"] }"><pre>{ <span class="pl-ent">"tags"</span>: [<span class="pl-s"><span class="pl-pds">"</span>ul<span class="pl-pds">"</span></span>, <span class="pl-s"><span class="pl-pds">"</span>LI<span class="pl-pds">"</span></span>] }</pre></div> <p dir="auto">Resulting CSS:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="*{color:green}ul,li{color:blue}ul.foo{color:red}"><pre><span class="pl-ent"><span class="pl-c1">*</span></span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>green}<span class="pl-ent">ul</span><span class="pl-kos">,</span><span class="pl-ent">li</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>blue}<span class="pl-ent">ul</span>.<span class="pl-c1">foo</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>red}</pre></div> <p dir="auto">Filtering performs for nested selectors too. <code>:not()</code> pseudos content is ignoring since the result of matching is unpredictable. Example for the same usage data as above:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=":nth-child(2n of ul, ol) { color: red } :nth-child(3n + 1 of img) { color: yellow } :not(div, ol, ul) { color: green } :has(:matches(ul, ol), ul, ol) { color: blue }"><pre><span class="pl-kos">:</span><span class="pl-c1">nth-child</span>(2n of <span class="pl-ent">ul</span><span class="pl-kos">,</span> <span class="pl-ent">ol</span>) { <span class="pl-c1">color</span><span class="pl-kos">:</span> red } <span class="pl-kos">:</span><span class="pl-c1">nth-child</span>(3n + 1 of <span class="pl-ent">img</span>) { <span class="pl-c1">color</span><span class="pl-kos">:</span> yellow } <span class="pl-kos">:</span><span class="pl-c1">not</span>(<span class="pl-ent">div</span><span class="pl-kos">,</span> <span class="pl-ent">ol</span><span class="pl-kos">,</span> <span class="pl-ent">ul</span>) { <span class="pl-c1">color</span><span class="pl-kos">:</span> green } <span class="pl-kos">:</span><span class="pl-c1">has</span>(<span class="pl-kos">:</span><span class="pl-c1">matches</span>(<span class="pl-ent">ul</span><span class="pl-kos">,</span> <span class="pl-ent">ol</span>)<span class="pl-kos">,</span> <span class="pl-ent">ul</span><span class="pl-kos">,</span> <span class="pl-ent">ol</span>) { <span class="pl-c1">color</span><span class="pl-kos">:</span> blue }</pre></div> <p dir="auto">Turns into:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=":nth-child(2n of ul){color:red}:not(div,ol,ul){color:green}:has(:matches(ul),ul){color:blue}"><pre><span class="pl-kos">:</span><span class="pl-c1">nth-child</span>(2n of <span class="pl-ent">ul</span>){<span class="pl-c1">color</span><span class="pl-kos">:</span>red}<span class="pl-kos">:</span><span class="pl-c1">not</span>(<span class="pl-ent">div</span><span class="pl-kos">,</span><span class="pl-ent">ol</span><span class="pl-kos">,</span><span class="pl-ent">ul</span>){<span class="pl-c1">color</span><span class="pl-kos">:</span>green}<span class="pl-kos">:</span><span class="pl-c1">has</span>(<span class="pl-kos">:</span><span class="pl-c1">matches</span>(<span class="pl-ent">ul</span>)<span class="pl-kos">,</span><span class="pl-ent">ul</span>){<span class="pl-c1">color</span><span class="pl-kos">:</span>blue}</pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Black list filtering</h4><a id="user-content-black-list-filtering" class="anchor" aria-label="Permalink: Black list filtering" href="#black-list-filtering"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Black list filtering performs the same as white list filtering, but filters things that mentioned in the lists. <code>blacklist</code> can contain the lists <code>tags</code>, <code>ids</code> and <code>classes</code>.</p> <p dir="auto">Black list has a higher priority, so when something mentioned in the white list and in the black list then white list occurrence is ignoring. The <code>:not()</code> pseudos content ignoring as well.</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="* { color: green; } ul, ol, li { color: blue; } UL.foo, li.bar { color: red; }"><pre><span class="pl-ent"><span class="pl-c1">*</span></span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> green; } <span class="pl-ent">ul</span><span class="pl-kos">,</span> <span class="pl-ent">ol</span><span class="pl-kos">,</span> <span class="pl-ent">li</span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> blue; } <span class="pl-ent">UL</span>.<span class="pl-c1">foo</span><span class="pl-kos">,</span> <span class="pl-ent">li</span>.<span class="pl-c1">bar</span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> red; }</pre></div> <p dir="auto">Usage data:</p> <div class="highlight highlight-source-json notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ "blacklist": { "tags": ["ul"] }, "tags": ["ul", "LI"] }"><pre>{ <span class="pl-ent">"blacklist"</span>: { <span class="pl-ent">"tags"</span>: [<span class="pl-s"><span class="pl-pds">"</span>ul<span class="pl-pds">"</span></span>] }, <span class="pl-ent">"tags"</span>: [<span class="pl-s"><span class="pl-pds">"</span>ul<span class="pl-pds">"</span></span>, <span class="pl-s"><span class="pl-pds">"</span>LI<span class="pl-pds">"</span></span>] }</pre></div> <p dir="auto">Resulting CSS:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="*{color:green}li{color:blue}li.bar{color:red}"><pre><span class="pl-ent"><span class="pl-c1">*</span></span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>green}<span class="pl-ent">li</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>blue}<span class="pl-ent">li</span>.<span class="pl-c1">bar</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>red}</pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Scopes</h4><a id="user-content-scopes" class="anchor" aria-label="Permalink: Scopes" href="#scopes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Scopes is designed for CSS scope isolation solutions such as <a href="https://github.com/css-modules/css-modules">css-modules</a>. Scopes are similar to namespaces and define lists of class names that exclusively used on some markup. This information allows the optimizer to move rules more agressive. Since it assumes selectors from different scopes don't match for the same element. This can improve rule merging.</p> <p dir="auto">Suppose we have a file:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=".module1-foo { color: red; } .module1-bar { font-size: 1.5em; background: yellow; } .module2-baz { color: red; } .module2-qux { font-size: 1.5em; background: yellow; width: 50px; }"><pre>.<span class="pl-c1">module1-foo</span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> red; } .<span class="pl-c1">module1-bar</span> { <span class="pl-c1">font-size</span><span class="pl-kos">:</span> <span class="pl-c1">1.5<span class="pl-smi">em</span></span>; <span class="pl-c1">background</span><span class="pl-kos">:</span> yellow; } .<span class="pl-c1">module2-baz</span> { <span class="pl-c1">color</span><span class="pl-kos">:</span> red; } .<span class="pl-c1">module2-qux</span> { <span class="pl-c1">font-size</span><span class="pl-kos">:</span> <span class="pl-c1">1.5<span class="pl-smi">em</span></span>; <span class="pl-c1">background</span><span class="pl-kos">:</span> yellow; <span class="pl-c1">width</span><span class="pl-kos">:</span> <span class="pl-c1">50<span class="pl-smi">px</span></span>; }</pre></div> <p dir="auto">It can be assumed that first two rules are never used with the second two on the same markup. But we can't say that for sure without a markup review. The optimizer doesn't know it either and will perform safe transformations only. The result will be the same as input but with no spaces and some semicolons:</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=".module1-foo{color:red}.module1-bar{font-size:1.5em;background:#ff0}.module2-baz{color:red}.module2-qux{font-size:1.5em;background:#ff0;width:50px}"><pre>.<span class="pl-c1">module1-foo</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>red}.<span class="pl-c1">module1-bar</span>{<span class="pl-c1">font-size</span><span class="pl-kos">:</span><span class="pl-c1">1.5<span class="pl-smi">em</span></span>;<span class="pl-c1">background</span><span class="pl-kos">:</span><span class="pl-pds"><span class="pl-kos">#</span>ff0</span>}.<span class="pl-c1">module2-baz</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>red}.<span class="pl-c1">module2-qux</span>{<span class="pl-c1">font-size</span><span class="pl-kos">:</span><span class="pl-c1">1.5<span class="pl-smi">em</span></span>;<span class="pl-c1">background</span><span class="pl-kos">:</span><span class="pl-pds"><span class="pl-kos">#</span>ff0</span>;<span class="pl-c1">width</span><span class="pl-kos">:</span><span class="pl-c1">50<span class="pl-smi">px</span></span>}</pre></div> <p dir="auto">With usage data <code>CSSO</code> can produce better output. If follow usage data is provided:</p> <div class="highlight highlight-source-json notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{ "scopes": [ ["module1-foo", "module1-bar"], ["module2-baz", "module2-qux"] ] }"><pre>{ <span class="pl-ent">"scopes"</span>: [ [<span class="pl-s"><span class="pl-pds">"</span>module1-foo<span class="pl-pds">"</span></span>, <span class="pl-s"><span class="pl-pds">"</span>module1-bar<span class="pl-pds">"</span></span>], [<span class="pl-s"><span class="pl-pds">"</span>module2-baz<span class="pl-pds">"</span></span>, <span class="pl-s"><span class="pl-pds">"</span>module2-qux<span class="pl-pds">"</span></span>] ] }</pre></div> <p dir="auto">The result will be (29 bytes extra saving):</p> <div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=".module1-foo,.module2-baz{color:red}.module1-bar,.module2-qux{font-size:1.5em;background:#ff0}.module2-qux{width:50px}"><pre>.<span class="pl-c1">module1-foo</span><span class="pl-kos">,</span>.<span class="pl-c1">module2-baz</span>{<span class="pl-c1">color</span><span class="pl-kos">:</span>red}.<span class="pl-c1">module1-bar</span><span class="pl-kos">,</span>.<span class="pl-c1">module2-qux</span>{<span class="pl-c1">font-size</span><span class="pl-kos">:</span><span class="pl-c1">1.5<span class="pl-smi">em</span></span>;<span class="pl-c1">background</span><span class="pl-kos">:</span><span class="pl-pds"><span class="pl-kos">#</span>ff0</span>}.<span class="pl-c1">module2-qux</span>{<span class="pl-c1">width</span><span class="pl-kos">:</span><span class="pl-c1">50<span class="pl-smi">px</span></span>}</pre></div> <p dir="auto">If class name isn't mentioned in the <code>scopes</code> it belongs to default scope. <code>scopes</code> data doesn't affect <code>classes</code> whitelist. If class name mentioned in <code>scopes</code> but missed in <code>classes</code> (both sections are specified) it will be filtered.</p> <p dir="auto">Note that class name can't be set for several scopes. Also a selector can't have class names from different scopes. In both cases an exception will thrown.</p> <p dir="auto">Currently the optimizer doesn't care about changing order safety for out-of-bounds selectors (i.e. selectors that match to elements without class name, e.g. <code>.scope div</code> or <code>.scope ~ :last-child</code>). It assumes that scoped CSS modules doesn't relay on it's order. It may be fix in future if to be an issue.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="Y7GWin7BQUILAvh5BQz1J3W65fCXA1hmHIn8SeuyIei9UgyvvIeX9Z9RxEbDDrbR4jXYGHa1NK6He9d1DrxQ2A==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> CSS minifier with structural optimizations </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 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2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>92</strong> watching</a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/css/csso/forks" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>187</strong> forks</a> </div> <div class="mt-2"> <a class="Link--muted" href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2Fcss%2Fcsso&report=css+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame"> <a href="/css/csso/releases" data-view-component="true" class="Link--primary no-underline Link">Releases <span title="51" data-view-component="true" class="Counter">51</span></a></h2> <a class="Link--primary d-flex no-underline" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/css/csso/releases/tag/v5.0.5"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-tag flex-shrink-0 mt-1 color-fg-success"> <path d="M1 7.775V2.75C1 1.784 1.784 1 2.75 1h5.025c.464 0 .91.184 1.238.513l6.25 6.25a1.75 1.75 0 0 1 0 2.474l-5.026 5.026a1.75 1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> <div class="ml-2 min-width-0"> <div class="d-flex"> <span class="css-truncate css-truncate-target text-bold mr-2" style="max-width: none;">5.0.5</span> <span title="Label: Latest" data-view-component="true" class="Label Label--success flex-shrink-0"> Latest </span> </div> <div class="text-small color-fg-muted"><relative-time datetime="2022-08-10T17:41:50Z" class="no-wrap">Aug 10, 2022</relative-time></div> </div> </a> <div data-view-component="true" class="mt-3"> <a text="small" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/css/csso/releases" data-view-component="true" class="Link">+ 50 releases</a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/orgs/css/packages?repo_name=csso" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Packages <span title="0" hidden="hidden" data-view-component="true" class="Counter ml-1">0</span></a></h2> <div class="text-small color-fg-muted" > No packages published <br> </div> </div> </div> <div class="BorderGrid-row" > <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/css/csso/network/dependents" data-view-component="true" class="Link--primary no-underline Link">Used by <span title="16,410,200" data-view-component="true" class="Counter">16.4m</span></a> </h2> <a class="d-flex flex-items-center" href="/css/csso/network/dependents"> <ul class="hx_flex-avatar-stack list-style-none min-width-0"> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/184101655?s=64&v=4" width="32" height="32" alt="@progseMOON" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/66795977?s=64&v=4" width="32" height="32" alt="@psurge1" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/201695718?s=64&v=4" width="32" height="32" alt="@MALASRI5" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/88091545?s=64&v=4" width="32" height="32" alt="@lallalamin" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/161299093?s=64&v=4" width="32" height="32" alt="@cpmocampo" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/203203713?s=64&v=4" width="32" height="32" alt="@erikasboy" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/142105854?s=64&v=4" width="32" height="32" alt="@ImashDilharsha" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/86232948?s=64&v=4" width="32" height="32" alt="@Vvstr" /> </li> </ul> <span class="px-2 text-bold text-small no-wrap"> + 16,410,192 </span> </a> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/css/csso/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center">Contributors <span title="51" data-view-component="true" class="Counter ml-1">51</span></a></h2> <include-fragment src="/css/csso/contributors_list?count=51&current_repository=csso&items_to_show=14" aria-busy="true" aria-label="Loading contributors"> <ul class="list-style-none d-flex flex-wrap mb-n2"> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> <li class="mb-2 "> <div class="Skeleton avatar avatar-user mr-2" style="width:32px;height:32px;"></div> </li> </ul> </include-fragment> <div data-view-component="true" class="mt-3"> <a text="small" href="/css/csso/graphs/contributors" data-view-component="true" class="Link--inTextBlock Link">+ 37 contributors</a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3">Languages</h2> <div class="mb-2"> <span data-view-component="true" class="Progress"> <span style="background-color:#f1e05a !important;;width: 61.3%;" itemprop="keywords" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#663399 !important;;width: 34.0%;" itemprop="keywords" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#e34c26 !important;;width: 4.7%;" itemprop="keywords" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> </span></div> <ul class="list-style-none"> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/css/csso/search?l=javascript" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#f1e05a;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">JavaScript</span> <span>61.3%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/css/csso/search?l=css" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#663399;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">CSS</span> <span>34.0%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/css/csso/search?l=html" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#e34c26;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">HTML</span> <span>4.7%</span> </a> </li> </ul> </div> </div> </div> </div> </div></div> </div> </div> </turbo-frame> </main> </div> </div> <footer class="footer pt-8 pb-6 f6 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