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Overflow  |  web.dev

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data-category="Site-Wide Custom Events" data-label="Tab: HTML" track-name="html" > HTML </a> </tab> <tab > <a href="https://web.dev/learn/images" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/images" track-type="nav" track-metadata-position="nav - images" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Images" track-name="images" > Images </a> </tab> <tab > <a href="https://web.dev/learn/design" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/design" track-type="nav" track-metadata-position="nav - responsive design" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Responsive Design" track-name="responsive design" > Responsive Design </a> </tab> <tab > <a href="https://web.dev/learn/forms" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/forms" track-type="nav" track-metadata-position="nav - forms" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Forms" track-name="forms" > Forms </a> </tab> <tab > <a href="https://web.dev/learn/pwa" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/pwa" track-type="nav" track-metadata-position="nav - pwa" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: PWA" track-name="pwa" > PWA </a> </tab> <tab class="devsite-active"> <a href="https://web.dev/learn/css" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/css" track-type="nav" track-metadata-position="nav - css" track-metadata-module="primary nav" aria-label="CSS, selected" data-category="Site-Wide Custom Events" data-label="Tab: CSS" track-name="css" > CSS </a> </tab> <tab > <a href="https://web.dev/learn/performance" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/performance" track-type="nav" track-metadata-position="nav - performance" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Performance" track-name="performance" > Performance </a> </tab> <tab > <a href="https://web.dev/learn/testing" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/testing" track-type="nav" track-metadata-position="nav - testing" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Testing" track-name="testing" > Testing </a> </tab> <tab > <a href="https://web.dev/learn/javascript" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://web.dev/learn/javascript" track-type="nav" track-metadata-position="nav - javascript" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: JavaScript" track-name="javascript" > JavaScript </a> </tab> </nav> </devsite-tabs> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="/" class="devsite-site-logo-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav" track-name="webDev" track-metadata-position="nav" track-metadata-eventDetail="nav"> <picture> <source srcset="https://www.gstatic.com/devrel-devsite/prod/vd31e3ed8994e05c7f2cd0cf68a402ca7902bb92b6ec0977d7ef2a1c699fae3f9/web/images/lockup-dark-theme.svg" media="(prefers-color-scheme: dark)" class="devsite-dark-theme"> <img src="https://www.gstatic.com/devrel-devsite/prod/vd31e3ed8994e05c7f2cd0cf68a402ca7902bb92b6ec0977d7ef2a1c699fae3f9/web/images/lockup.svg" class="devsite-site-logo" alt="web.dev"> </picture> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/learn" class="devsite-nav-title gc-analytics-event devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Resources" track-name="resources" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Resources" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Resources </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Resources" track-name="resources" > <span class="devsite-nav-text" tooltip menu="Resources"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Resources"> </span> </span> </li> </ul> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/learn/privacy" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Privacy" track-name="privacy" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Privacy" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Privacy </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/accessibility" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Accessibility" track-name="accessibility" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Accessibility" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Accessibility </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/html" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: HTML" track-name="html" data-category="Site-Wide Custom Events" data-label="Responsive Tab: HTML" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > HTML </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/images" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Images" track-name="images" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Images" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Images </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/design" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Responsive Design" track-name="responsive design" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Responsive Design" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Responsive Design </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/forms" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Forms" track-name="forms" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Forms" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Forms </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/pwa" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: PWA" track-name="pwa" data-category="Site-Wide Custom Events" data-label="Responsive Tab: PWA" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > PWA </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/css" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: CSS" track-name="css" data-category="Site-Wide Custom Events" data-label="Responsive Tab: CSS" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> CSS </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/performance" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Performance" track-name="performance" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Performance" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Performance </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/testing" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Testing" track-name="testing" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Testing" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Testing </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/learn/javascript" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: JavaScript" track-name="javascript" data-category="Site-Wide Custom Events" data-label="Responsive Tab: JavaScript" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > JavaScript </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/baseline" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Baseline" track-name="baseline" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Baseline" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Baseline </span> </a> </li> <li class="devsite-nav-item"> <a href="/blog" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Blog" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Blog </span> </a> </li> <li class="devsite-nav-item"> <a href="/case-studies" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Case Studies" track-name="case studies" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Case Studies" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Case Studies </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item"><a href="/learn/css/welcome" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/welcome" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/welcome" ><span class="devsite-nav-text" tooltip>Welcome to Learn CSS!</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/box-model" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/box-model" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/box-model" ><span class="devsite-nav-text" tooltip>Box Model</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/selectors" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/selectors" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/selectors" ><span class="devsite-nav-text" tooltip>Selectors</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/the-cascade" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/the-cascade" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/the-cascade" ><span class="devsite-nav-text" tooltip>The cascade</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/specificity" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/specificity" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/specificity" ><span class="devsite-nav-text" tooltip>Specificity</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/inheritance" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/inheritance" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/inheritance" ><span class="devsite-nav-text" tooltip>Inheritance</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/color" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/color" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/color" ><span class="devsite-nav-text" tooltip>Color</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/sizing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/sizing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/sizing" ><span class="devsite-nav-text" tooltip>Sizing Units</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/layout" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/layout" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/layout" ><span class="devsite-nav-text" tooltip>Layout</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/flexbox" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/flexbox" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/flexbox" ><span class="devsite-nav-text" tooltip>Flexbox</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/grid" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/grid" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/grid" ><span class="devsite-nav-text" tooltip>Grid</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/logical-properties" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/logical-properties" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/logical-properties" ><span class="devsite-nav-text" tooltip>Logical Properties</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/spacing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/spacing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/spacing" ><span class="devsite-nav-text" tooltip>Spacing</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/pseudo-elements" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/pseudo-elements" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/pseudo-elements" ><span class="devsite-nav-text" tooltip>Pseudo-elements</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/pseudo-classes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/pseudo-classes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/pseudo-classes" ><span class="devsite-nav-text" tooltip>Pseudo-classes</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/borders" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/borders" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/borders" ><span class="devsite-nav-text" tooltip>Borders</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/shadows" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/shadows" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/shadows" ><span class="devsite-nav-text" tooltip>Shadows</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/focus" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/focus" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/focus" ><span class="devsite-nav-text" tooltip>Focus</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/z-index" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/z-index" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/z-index" ><span class="devsite-nav-text" tooltip>Z-index and stacking contexts</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/functions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/functions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/functions" ><span class="devsite-nav-text" tooltip>Functions</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/gradients" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/gradients" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/gradients" ><span class="devsite-nav-text" tooltip>Gradients</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/animations" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/animations" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/animations" ><span class="devsite-nav-text" tooltip>Animations</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/filters" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/filters" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/filters" ><span class="devsite-nav-text" tooltip>Filters</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/blend-modes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/blend-modes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/blend-modes" ><span class="devsite-nav-text" tooltip>Blend Modes</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/lists" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/lists" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/lists" ><span class="devsite-nav-text" tooltip>Lists</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/transitions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/transitions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/transitions" ><span class="devsite-nav-text" tooltip>Transitions</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/overflow" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /learn/css/overflow" track-type="bookNav" track-name="click" track-metadata-eventdetail="/learn/css/overflow" ><span class="devsite-nav-text" tooltip>Overflow</span></a></li> <li class="devsite-nav-item"><a href="/learn/css/backgrounds" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav 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Chrome is back at Google I/O on May 20-21! <a href="https://io.google/2025/register/?utm_source=devsite&utm_medium=embedded_marketing&utm_campaign=wdd&utm_content=">Register now</a> </div> </div> </div> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://web.dev/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="web.dev" > web.dev </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://web.dev/learn" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="2" track-type="globalNav" track-name="breadcrumb" track-metadata-position="2" track-metadata-eventdetail="" > Resources </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://web.dev/learn/css" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="" > CSS </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1"> Overflow <div class="devsite-actions" data-nosnippet><devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip></div> </h1> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <h5 id="the-css-podcast---034:-overflow" data-text=" The CSS Podcast - 034: Overflow " tabindex="-1"> <a href="https://thecsspodcast.libsyn.com/034-overflow" target="_blank">The CSS Podcast - 034: Overflow </a> </h5> <p><audio controls src="https://traffic.libsyn.com/secure/thecsspodcast/TCP034_v1.mp3?dest-id=1891556"> </audio></p> <p>When content extends beyond its parent, there are many options for how you can handle it. You can scroll to add additional space, clip the overflowing edges, indicate the cut-off with an ellipsis, and so much more. Overflow is especially important to consider when developing for phone applications and multiple screen sizes.</p> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/LYjEjWZ?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen LYjEjWZ by web-dot-dev on Codepen" ></iframe> </div> </figure> <p>There are two different clipping options in CSS; <code translate="no" dir="ltr">text-overflow</code> will help with individual lines of text, and the <code translate="no" dir="ltr">overflow</code> properties will help control overflow in the box model.</p> <h2 id="single_line_overflow_with_text-overflow" data-text="Single line overflow with text-overflow" tabindex="-1">Single line overflow with <code translate="no" dir="ltr">text-overflow</code></h2> <p>Use the <a href="https://developer.mozilla.org/docs/Web/CSS/text-overflow"><code translate="no" dir="ltr">text-overflow</code></a> property on any element that contains text node(s), for example a paragraph, <code translate="no" dir="ltr">&lt;p&gt;</code>. It specifies how the text appears when it doesn’t fit in the available space of the element. All viewable HTML text on a page is in <a href="https://developer.mozilla.org/docs/Web/API/Text">text nodes</a>. To use <code translate="no" dir="ltr">text-overflow</code> you need a single unwrapped line of text, so you must also set <code translate="no" dir="ltr">overflow</code> to <code translate="no" dir="ltr">hidden</code> and have a <code translate="no" dir="ltr">white-space</code> value that prevents wrapping.</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="CSS"><code translate="no" dir="ltr"><span class="devsite-syntax-nt">p</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">text-overflow</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">ellipsis</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">overflow</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">hidden</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">white-space</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">nowrap</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/rNwQXyN?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen rNwQXyN by web-dot-dev on Codepen" ></iframe> </div> </figure> <h2 id="using_overflow_properties" data-text="Using overflow properties" tabindex="-1">Using overflow properties</h2> <p>Overflow properties are set on an element to control what happens when its children need more space than it has available. This can be intentional, like in an interactive map like Google Maps, where a user pans around a large image clipped to a specific size. It can also be unintentional like in a chat application where the user types a lengthy message that doesn’t fit in the text bubble.</p> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/KKvwvXE?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen KKvwvXE by web-dot-dev on Codepen" ></iframe> </div> </figure> <p>You can think of the overflow in two parts. The parent element has a firmly constrained space that will not change. You can think of this as a window. The child elements are content that want more space from the parent. You can think of this as what you are looking through the window at. Managing overflow will help guide how the window frames this content.</p> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/xxrmxOm?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen xxrmxOm by web-dot-dev on Codepen" ></iframe> </div> </figure> <h3 id="scrolling_on_the_vertical_and_horizontal_axis" data-text="Scrolling on the vertical and horizontal axis" tabindex="-1">Scrolling on the vertical and horizontal axis</h3> <p>The <code translate="no" dir="ltr">overflow-y</code> property controls physical overflow along the vertical axis of the device viewport, therefore scrolling up and down.</p> <p>The <code translate="no" dir="ltr">overflow-x</code> property controls overflow along the horizontal axis of the device viewport, therefore scrolling left and right.</p> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/YzQdzoG?height=500&theme-id=light&default-tab=css%2Cresult&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen YzQdzoG by web-dot-dev on Codepen" ></iframe> </div> </figure> <h3 id="logical_properties_for_scroll_direction" data-text="Logical properties for scroll direction" tabindex="-1">Logical properties for scroll direction</h3> <p> <div class="wd-browser-compat" translate="no"> <p>Browser Support</p> <ul> <li data-support="yes"> <img alt="Chrome: 135." src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='-10 -10 276 276'%3E%3ClinearGradient id='a' x1='145' x2='34' y1='253' y2='61' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' stop-color='%231e8e3e'/%3E%3Cstop 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href="https://developer.mozilla.org/docs/Web/CSS/overflow-block"><code translate="no" dir="ltr">overflow-block</code></a> properties set the overflow based on the document direction and writing mode.</p> <h3 id="the_overflow_shorthand" data-text="The overflow shorthand" tabindex="-1">The <code translate="no" dir="ltr">overflow</code> shorthand</h3> <p>The <a href="https://developer.mozilla.org/docs/Web/CSS/overflow"><code translate="no" dir="ltr">overflow</code></a> shorthand sets both <code translate="no" dir="ltr">overflow-x</code> and <code translate="no" dir="ltr">overflow-y</code> styles in one line:</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="CSS"><code translate="no" dir="ltr"><span class="devsite-syntax-nt">overflow</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">hidden</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">scroll</span><span class="devsite-syntax-o">;</span> </code></pre></devsite-code> <p>If two keywords are specified, the first applies to <code translate="no" dir="ltr">overflow-x</code> and the second to <code translate="no" dir="ltr">overflow-y</code>. Otherwise, both <code translate="no" dir="ltr">overflow-x</code> and <code translate="no" dir="ltr">overflow-y</code> use the same value.</p> <h4 id="values" data-text="Values" tabindex="-1">Values</h4> <p>Let&#39;s take a closer look at the <a href="https://developer.mozilla.org/docs/Web/CSS/overflow#values">values and keywords</a> available for the <code translate="no" dir="ltr">overflow</code> properties.</p> <dl> <dt><code translate="no" dir="ltr">overflow: visible</code> (default)</dt> <dd>Without setting the property, <code translate="no" dir="ltr">overflow: visible</code> is the default value for the web. This ensures that content is never unintentionally hidden and follows the core tenets of &quot;never hide content&quot; or &quot;safe layouts of precise layouts&quot;.</dd> <dt><code translate="no" dir="ltr">overflow: hidden</code></dt> <dd>With <code translate="no" dir="ltr">overflow: hidden</code> content is clipped in the specified direction, and no scrollbars are provided to show it.</dd> <dt><code translate="no" dir="ltr">overflow: scroll</code></dt> <dd><code translate="no" dir="ltr">overflow: scroll</code> enables scrollbars to allow users to scroll through content. Even if content isn&#39;t currently overflowing, scrollbars will be present. This is a great way to reduce future layout shift if a container may be scrollable in the future based, for example, on resize, and visually prepare the user for scrollable areas.</dd> <dt><code translate="no" dir="ltr">overflow: clip</code></dt> <dd>Like <code translate="no" dir="ltr">overflow: hidden</code>, the content with <code translate="no" dir="ltr">overflow: clip</code> is clipped to the element&#39;s padding box. The difference between <code translate="no" dir="ltr">clip</code> and <code translate="no" dir="ltr">hidden</code> is that the <code translate="no" dir="ltr">clip</code> keyword also forbids all scrolling, including programmatic scrolling.</dd> <dt><code translate="no" dir="ltr">overflow: auto</code></dt> <dd>Finally, the value most commonly used, <code translate="no" dir="ltr">overflow: auto</code>. This respects the user&#39;s preferences and shows scrollbars if needed, but hides them by default, and gives responsibility for scrolling to the user and browser.</dd> </dl> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/gORZaaa?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen gORZaaa by web-dot-dev on Codepen" ></iframe> </div> </figure> <aside class="note"><b>Note: </b> Using the <code translate="no" dir="ltr">overflow</code> property with a value other than <code translate="no" dir="ltr">visible</code> creates a <a href="https://developer.mozilla.org/docs/Web/Guide/CSS/Block_formatting_context">block formatting context</a>. </aside> <h2 id="scrolling_and_overflow" data-text="Scrolling and overflow" tabindex="-1">Scrolling and overflow</h2> <p>Many of these <code translate="no" dir="ltr">overflow</code> behaviors introduce a scrollbar, but there’s a few specific scroll behaviors and properties that can help you control scrolling on your overflow container.</p> <h3 id="scrolling_and_accessibility" data-text="Scrolling and accessibility" tabindex="-1">Scrolling and accessibility</h3> <p>It&#39;s important to make sure that the scrollable area can accept focus so that a keyboard user can tab to the box, then use the arrow keys to scroll.</p> <p>To allow a scrolling box to accept focus add <code translate="no" dir="ltr">tabindex=&quot;0&quot;</code>, a name with the <a href="https://developer.mozilla.org/docs/Web/Accessibility/ARIA/Attributes/aria-labelledby"><code translate="no" dir="ltr">aria-labelledby</code></a> attribute, and an appropriate <code translate="no" dir="ltr">role</code> attribute. For example:</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="HTML"><code translate="no" dir="ltr">&lt;div tabindex="0" role="region" aria-labelledby="id-of-descriptive-text"&gt; content &lt;/div&gt; </code></pre></devsite-code> <p>CSS can then be used to indicate that the box has focus, using the <code translate="no" dir="ltr">outline</code> property to give a visual clue that it will now be scrollable.</p> <p>In <a href="https://adrianroselli.com/2021/06/using-css-to-enforce-accessibility.html">Using CSS to Enforce Accessibility</a> Adrian Roselli demonstrates how CSS can help prevent accessibility regressions. For example, to only turn on scrolling and add the focus indicator if the correct attributes are used. The following rules will only make the box scrollable if it has a <code translate="no" dir="ltr">tabindex</code>, <code translate="no" dir="ltr">aria-labelledby</code>, and <code translate="no" dir="ltr">role</code> attribute.</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="CSS"><code translate="no" dir="ltr"><span class="devsite-syntax-o">[</span><span class="devsite-syntax-nt">role</span><span class="devsite-syntax-o">][</span><span class="devsite-syntax-nt">aria-labelledby</span><span class="devsite-syntax-o">][</span><span class="devsite-syntax-nt">tabindex</span><span class="devsite-syntax-o">]</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">overflow</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">auto</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-p">}</span> <span class="devsite-syntax-o">[</span><span class="devsite-syntax-nt">role</span><span class="devsite-syntax-o">][</span><span class="devsite-syntax-nt">aria-labelledby</span><span class="devsite-syntax-o">][</span><span class="devsite-syntax-nt">tabindex</span><span class="devsite-syntax-o">]</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-nd">focus</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">outline</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-mf">.1</span><span class="devsite-syntax-kt">em</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">solid</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">blue</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <h3 id="scrollbar_positioning_within_the_box_model" data-text="Scrollbar positioning within the box model" tabindex="-1">Scrollbar positioning within the box model</h3> <p>Scroll bars take up space within the padding box and can compete for space if <code translate="no" dir="ltr">inline</code> and not <code translate="no" dir="ltr">overlaid</code>. The <a href="/learn/css/box-model#the_areas_of_the_box_model">box model module</a> expands more on this potential source of layout shift.</p> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/BaReoEV?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen BaReoEV by web-dot-dev on Codepen" ></iframe> </div> </figure> <h3 id="root-scroller_vs_implicit-scroller" data-text="root-scroller vs implicit-scroller" tabindex="-1">root-scroller vs implicit-scroller</h3> <p>You may notice that some scrollers have a pull-to-refresh behavior and other special behaviors, especially when developing for mobile and hybrid applications. This scroll behavior happens on the root scroller. There is only ever one root scroller on a page. By default, the <a href="https://developer.mozilla.org/docs/Web/API/Document/documentElement">documentElement</a> is the page&#39;s root scroller, however, by changing which element is the root scroller, the special behaviors can be applied to scrollers other than the documentElement, we call this new scroller the implicit root scroller.</p> <p>To create a root scroller, you can use something called <em>scroller promotion</em> by positioning a container as fixed, ensuring it covers the entire viewport and is z-index on top with a scroller. Experience a root scroller vs a nested implicit scroller <a href="https://cdpn.io/web-dot-dev/debug/dyzPzwz">here</a>.</p> <figure> <video playsinline autoplay loop muted width="380" > <source src="/static/learn/css/overflow/video/dQwiPAoChjTYzXYCNg6U6Tsnr3x1/sn1cOusFy18gRkZroAET.mp4" type="video/mp4" /> </video> <figcaption class="wd-caption"> The video shows a root scroller with bounce behavior and new styling features, <br> compared to scrolling an implicit scroller with no enhanced scroll behavior. </figcaption> </figure> <h3 id="scroll-behavior" data-text="scroll-behavior" tabindex="-1">scroll-behavior</h3> <p> <div class="wd-browser-compat" translate="no"> <p>Browser Support</p> <ul> <li data-support="yes"> <img alt="Chrome: 61." src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='-10 -10 276 276'%3E%3ClinearGradient id='a' x1='145' x2='34' y1='253' y2='61' gradientUnits='userSpaceOnUse'%3E%3Cstop offset='0' 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1-11-5l-3-1 3 1c-29-15-54-44-57-79 0 0 12-41 80-41 7 0 28-20 29-26 0-2-42-19-58-35l-17-16a71 71 0 0 0-6-5 111 111 0 0 1-1-58c-25 11-44 29-58 44-9-12-9-52-8-60l-8 4a175 175 0 0 0-24 21 210 210 0 0 0-22 26 203 203 0 0 0-32 73l-1 2-2 15a279 279 0 0 0-4 34v1a240 240 0 0 0 477 40l1-9c5-41 0-84-15-121zm-24 13z' fill='url(%23ff-l)'/%3E%3C/svg%3E" > <span aria-hidden="true"> 36 </span> </li> <li data-support="yes"> <img alt="Safari: 15.4." src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='24' height='24' viewBox='195 190 135 135'%3E%3Cdefs%3E%3ClinearGradient id='s-a' x1='132.6' x2='134.4' y1='111.7' y2='-105.3' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%23d2d2d2' /%3E%3Cstop offset='.5' stop-color='%23f2f2f2' /%3E%3Cstop offset='1' stop-color='%23fff' /%3E%3C/linearGradient%3E%3ClinearGradient id='s-b' gradientUnits='userSpaceOnUse' /%3E%3ClinearGradient id='s-c' x1='65.4' x2='67.4' y1='115.7' y2='17.1' 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stop-color='%235488d6' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235d96eb' /%3E%3C/radialGradient%3E%3C/defs%3E%3Crect width='220' height='220' x='22' y='-107' fill='url(%23s-a)' ry='49' transform='matrix(.57 0 0 .57 187 256)' /%3E%3Cg transform='translate(194 190)'%3E%3Ccircle cx='67.8' cy='67.7' fill='url(%23s-c)' paint-order='stroke fill markers' r='54' /%3E%3Ccircle cx='-69.9' cy='69.3' fill='url(%23s-i)' transform='translate(138 -2)' r='54' /%3E%3C/g%3E%3Cellipse cx='120' cy='14.2' fill='url(%23s-j)' rx='93.1' ry='93.7' transform='matrix(.58 0 0 .58 192 250)' /%3E%3Cg transform='matrix(.58 0 0 .57 197 182)'%3E%3Cpath fill='%23cac7c8' d='M46 192h1l72-48-7-9-66 57Z' /%3E%3Cpath fill='%23fbfffc' d='M46 191v1l66-57-7-9-59 65Z' /%3E%3Cpath fill='url(%23s-d)' d='m119 144-7-9 66-57-59 66Z' /%3E%3Cpath fill='%23fb645c' d='m105 126 7 9 66-57-1-1-72 49Z' /%3E%3C/g%3E%3Cpath stroke='%23fff' stroke-linecap='round' stroke-miterlimit='1' stroke-width='1.3' d='m287 278 3-2m-12-17 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This allows you to specify how in-page navigation like <code translate="no" dir="ltr">.scrollTo()</code> or links are handled.</p> <p>This is especially useful when used with <a href="https://developer.mozilla.org/docs/Web/CSS/@media/prefers-reduced-motion">prefers-reduced-motion</a> to specify scroll behavior based on user preference.</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="CSS"><code translate="no" dir="ltr"><span class="devsite-syntax-p">@</span><span class="devsite-syntax-k">media</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-o">(</span><span class="devsite-syntax-nt">prefers-reduced-motion</span><span class="devsite-syntax-o">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-nt">no-preference</span><span class="devsite-syntax-o">)</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">.</span><span class="devsite-syntax-nc">scroll-view</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">{</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-k">scroll-behavior</span><span class="devsite-syntax-p">:</span><span class="devsite-syntax-w"> </span><span class="devsite-syntax-kc">auto</span><span class="devsite-syntax-p">;</span> <span class="devsite-syntax-w"> </span><span class="devsite-syntax-p">}</span> <span class="devsite-syntax-p">}</span> </code></pre></devsite-code> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/oNwJgae?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen oNwJgae by web-dot-dev on Codepen" ></iframe> </div> </figure> <h3 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99v-8m49-42h-8' transform='translate(-65 8)' /%3E%3C/svg%3E" > <span aria-hidden="true"> 16 </span> </li> </ul> <p><a href="https://developer.mozilla.org/docs/Web/CSS/overscroll-behavior">Source</a></p> </div> </p> <p>If you’ve ever reached the end of a modal overlay, then continued scrolling and had the page behind the overlay move, this is the scroll chaining, or bubbling up to the parent scroll container. The <a href="https://developer.mozilla.org/docs/Web/CSS/overscroll-behavior"><code translate="no" dir="ltr">overscroll-behavior</code></a> property allows you to prevent overflow scrolling leaking into a parent container (called scroll chaining).</p> <figure> <div class="wd-embed" style="height: 500px; width: 100%"> <iframe allow="camera; clipboard-read; clipboard-write; encrypted-media; geolocation; microphone; midi;" loading="lazy" src="https://codepen.io/web-dot-dev/embed/powqJQe?height=500&theme-id=light&default-tab=result&editable=true" style="height: 100%; width: 100%; border: 0;" title="Pen powqJQe by web-dot-dev on Codepen" ></iframe> </div> </figure> <h3 id="check_your_understanding" class="hide-from-toc" data-text="Check your understanding" tabindex="-1">Check your understanding</h3> <p>Test your knowledge of overflow</p> <div class="wd-assessment"><devsite-multiple-choice> <div><p>Text overflow and element overflow are the same?</p> </div> <div> <div>true</div> <div>Text overflow is special when compared to element overflow.</div> </div> <div correct> <div>false</div> <div>Text overflow is generally about inline overflow, where element overflow is about block overflow.</div> </div> </devsite-multiple-choice> <devsite-multiple-choice> <div><p>The <code translate="no" dir="ltr">overflow</code> property accepts 2 keywords, the first keyword is for which axis?</p> </div> <div correct> <div>horizontal</div> <div>🎉</div> </div> <div> <div>vertical</div> <div>Almost always, when passing two shorthand values, the first is horizontal.</div> </div> </devsite-multiple-choice> <devsite-multiple-choice> <div><p>Which space in the box model do scrollbars consume when showing and inline?</p> </div> <div> <div>content box</div> <div>Try again!</div> </div> <div correct> <div>padding box</div> <div>Scrollbars in <code translate="no" dir="ltr">overlay</code> mode will overlap the padding, and when in <code translate="no" dir="ltr">inline</code> mode will add to the padding.</div> </div> <div> <div>border box</div> <div>Try again!</div> </div> <div> <div>margin box</div> <div>Try again!</div> </div> </devsite-multiple-choice> <devsite-multiple-choice> <div><p>To trap extra momentum from scrolling in a nested implicit scroller, which property would you use?</p> </div> <div> <div><code translate="no" dir="ltr">scroll-behavior</code></div> <div>Try again!</div> </div> <div> <div><code translate="no" dir="ltr">scroll-hint</code></div> <div>Try again!</div> </div> <div correct> <div><code translate="no" dir="ltr">overscroll-behavior</code></div> <div>Setting this property to <code translate="no" dir="ltr">contain</code> will trap scrolling.</div> </div> <div> <div><code translate="no" dir="ltr">scroll-padding</code></div> <div>Try again!</div> </div> <div> <div><code translate="no" dir="ltr">overscroll-effect</code></div> <div>Try again!</div> </div> </devsite-multiple-choice> </div> <h2 id="resources" data-text="Resources" tabindex="-1">Resources</h2> <p><a href="https://www.smashingmagazine.com/2019/09/overflow-data-loss-css/">Overflow And Data Loss In CSS from Smashing Magazine</a></p> </div> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. 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