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class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><div class="sidebar-inner-nav"><div class="in-nav-toc"></div><aside class="curriculum-sidebar " data-current="/en-US/curriculum/extensions/"><ol><li class=""><a href="/en-US/curriculum/">MDN Curriculum</a></li><li class=""><a href="/en-US/curriculum/about-curriculum/">About Curriculum</a></li><li class="toggle"><details><summary>Getting started modules</summary><ol><li><a href="/en-US/curriculum/getting-started/">Getting started overview</a></li><li><a href="/en-US/curriculum/getting-started/soft-skills/">1. Soft skills</a></li><li><a href="/en-US/curriculum/getting-started/environment-setup/">2. Environment setup</a></li></ol></details></li><li class="toggle"><details><summary>Core modules</summary><ol><li><a href="/en-US/curriculum/core/">Core overview</a></li><li><a href="/en-US/curriculum/core/web-standards/">1. Web standards</a></li><li><a href="/en-US/curriculum/core/semantic-html/">2. Semantic HTML</a></li><li><a href="/en-US/curriculum/core/css-fundamentals/">3. CSS fundamentals</a></li><li><a href="/en-US/curriculum/core/css-text-styling/">4. CSS text styling</a></li><li><a href="/en-US/curriculum/core/css-layout/">5. CSS layout</a></li><li><a href="/en-US/curriculum/core/javascript-fundamentals/">6. JavaScript fundamentals</a></li><li><a href="/en-US/curriculum/core/accessibility/">7. Accessibility</a></li><li><a href="/en-US/curriculum/core/design-for-developers/">8. Design for developers</a></li><li><a href="/en-US/curriculum/core/version-control/">9. Version control</a></li></ol></details></li><li class="toggle"><details open=""><summary>Extensions modules</summary><ol><li><em><a href="/en-US/curriculum/extensions/" aria-current="page">Extensions overview</a></em></li><li><a href="/en-US/curriculum/extensions/transform-and-animate-css/">1. Transform & animate CSS</a></li><li><a href="/en-US/curriculum/extensions/custom-js-objects/">2. Custom JS objects</a></li><li><a href="/en-US/curriculum/extensions/web-apis/">3. Web APIs</a></li><li><a href="/en-US/curriculum/extensions/performance/">4. Performance</a></li><li><a href="/en-US/curriculum/extensions/security-and-privacy/">5. Security and privacy</a></li><li><a href="/en-US/curriculum/extensions/testing/">6. Testing</a></li><li><a href="/en-US/curriculum/extensions/a-practical-understanding-of-javascript-frameworks/">7. JavaScript frameworks</a></li><li><a href="/en-US/curriculum/extensions/css-tooling/">8. CSS tooling</a></li><li><a href="/en-US/curriculum/extensions/other-tooling-types/">9. Other tooling types</a></li></ol></details></li><li class=""><a href="/en-US/curriculum/faq/">Frequently asked questions</a></li><li class=""><a href="/en-US/curriculum/resources-for-educators/">Resources for Educators</a></li></ol></aside></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav></nav></aside><section class="place side"></section></div></div><article id="content" class="curriculum-content" lang="en-US"><header><h1><span>Extensions</span> modules</h1></header><div class="section-content"><p>These "extension" modules constitute useful additional skills to learn as web developers start to expand their knowledge and develop specialisms.</p></div><section class="module-contents"><h2>Module list</h2><ol class="modules-list"><li class="module-list-item topic-standards"><a href="/en-US/curriculum/extensions/transform-and-animate-css/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon standards"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#C1283E" d="m31.112 18.75 2.45.5-4.675 22-2.45-.5zM39.487 30 35 25.512v-3.537L43.025 30 35 38.013v-3.538zm-22.512 0L25 21.975v3.537L20.512 30 25 34.475v3.538z"></path></svg><span>1. Transform & animate CSS</span></header><section><p>Add animations to your toolbox to enhance user experience and perceived performance.</p><p>Web Standards & Semantics</p></section></a></li><li class="module-list-item topic-scripting"><a href="/en-US/curriculum/extensions/custom-js-objects/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-scripting"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#6A621C" d="M22.48 38.127a7.7 7.7 0 0 1-1.6-.152q-.697-.153-.697-.559 0-.09.063-.406a3.7 3.7 0 0 1 .165-.584q.114-.267.28-.267.025 0 .279.051.33.075.571.127.255.038.571.038 1.677 0 2.412-.66.75-.66.75-2.12V22.65q0-.507.9-.507h.178q.915 0 .915.507v10.715q0 2.247-1.156 3.504-1.142 1.257-3.63 1.257m11.675 0q-1.245 0-2.323-.267-1.065-.279-1.714-.66-.635-.394-.635-.71 0-.18.14-.47.153-.293.343-.521t.304-.229q.102 0 .445.204.787.406 1.561.673.775.266 1.88.266.863 0 1.535-.33.673-.33 1.041-.927a2.6 2.6 0 0 0 .381-1.396q0-.838-.457-1.384a3.15 3.15 0 0 0-1.091-.876q-.636-.33-1.854-.812-1.32-.508-2.095-.94-.762-.445-1.307-1.282-.534-.839-.534-2.222 0-1.206.623-2.158.621-.965 1.764-1.498 1.143-.534 2.628-.533.673 0 1.536.19.864.178 1.473.495.622.318.622.699 0 .165-.14.456a2.5 2.5 0 0 1-.304.508q-.178.23-.28.229-.114 0-.457-.19a7 7 0 0 0-1.13-.483q-.558-.19-1.358-.19-1.308 0-2.12.672-.8.673-.8 1.88 0 .723.355 1.193.356.47.902.749.546.28 1.523.647.064.013.292.102 1.346.52 2.197 1.015.863.482 1.46 1.397.609.914.609 2.336 0 1.332-.622 2.323-.609.99-1.752 1.523-1.13.52-2.64.521"></path></svg><span>2. Custom JS objects</span></header><section><p>Create custom JavaScript objects to gain a deeper understanding of object-oriented programming.</p><p>Scripting</p></section></a></li><li class="module-list-item topic-scripting"><a href="/en-US/curriculum/extensions/web-apis/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-scripting"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#6A621C" d="M22.48 38.127a7.7 7.7 0 0 1-1.6-.152q-.697-.153-.697-.559 0-.09.063-.406a3.7 3.7 0 0 1 .165-.584q.114-.267.28-.267.025 0 .279.051.33.075.571.127.255.038.571.038 1.677 0 2.412-.66.75-.66.75-2.12V22.65q0-.507.9-.507h.178q.915 0 .915.507v10.715q0 2.247-1.156 3.504-1.142 1.257-3.63 1.257m11.675 0q-1.245 0-2.323-.267-1.065-.279-1.714-.66-.635-.394-.635-.71 0-.18.14-.47.153-.293.343-.521t.304-.229q.102 0 .445.204.787.406 1.561.673.775.266 1.88.266.863 0 1.535-.33.673-.33 1.041-.927a2.6 2.6 0 0 0 .381-1.396q0-.838-.457-1.384a3.15 3.15 0 0 0-1.091-.876q-.636-.33-1.854-.812-1.32-.508-2.095-.94-.762-.445-1.307-1.282-.534-.839-.534-2.222 0-1.206.623-2.158.621-.965 1.764-1.498 1.143-.534 2.628-.533.673 0 1.536.19.864.178 1.473.495.622.318.622.699 0 .165-.14.456a2.5 2.5 0 0 1-.304.508q-.178.23-.28.229-.114 0-.457-.19a7 7 0 0 0-1.13-.483q-.558-.19-1.358-.19-1.308 0-2.12.672-.8.673-.8 1.88 0 .723.355 1.193.356.47.902.749.546.28 1.523.647.064.013.292.102 1.346.52 2.197 1.015.863.482 1.46 1.397.609.914.609 2.336 0 1.332-.622 2.323-.609.99-1.752 1.523-1.13.52-2.64.521"></path></svg><span>3. Web APIs</span></header><section><p>Study common WebAPIs in depth to appreciate how WebAPIs work in general.</p><p>Scripting</p></section></a></li><li class="module-list-item topic-practices"><a href="/en-US/curriculum/extensions/performance/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-practices"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#356A1C" d="M35.96 28.42a.5.5 0 0 1-.69 0l-3.861-3.683a.5.5 0 0 1 0-.724l1.11-1.059a.5.5 0 0 1 .69 0l2.06 1.967a.5.5 0 0 0 .69 0l4.813-4.592a.5.5 0 0 1 .69 0l1.11 1.06a.5.5 0 0 1 0 .723zm-7.55-4.17a.5.5 0 0 0-.5-.5H17.12a.5.5 0 0 0-.5.5v1.5a.5.5 0 0 0 .5.5h10.79a.5.5 0 0 0 .5-.5zm12.72 7.862a.5.5 0 0 0 0-.724l-1.109-1.059a.5.5 0 0 0-.69 0l-2.716 2.592a.5.5 0 0 1-.69 0l-2.716-2.592a.5.5 0 0 0-.69 0l-1.11 1.06a.5.5 0 0 0 0 .723l2.648 2.526a.5.5 0 0 1 0 .724l-2.648 2.526a.5.5 0 0 0 0 .724l1.11 1.059a.5.5 0 0 0 .69 0l2.716-2.592a.5.5 0 0 1 .69 0l2.716 2.592a.5.5 0 0 0 .69 0l1.11-1.06a.5.5 0 0 0 0-.723l-2.648-2.526a.5.5 0 0 1 0-.724zM28.41 34.25a.5.5 0 0 0-.5-.5H17.12a.5.5 0 0 0-.5.5v1.5a.5.5 0 0 0 .5.5h10.79a.5.5 0 0 0 .5-.5z"></path></svg><span>4. Performance</span></header><section><p>Explore how to create performant, fast-loading websites and enhance perceived performance.</p><p>Best Practices</p></section></a></li><li class="module-list-item topic-practices"><a href="/en-US/curriculum/extensions/security-and-privacy/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-practices"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#356A1C" d="M35.96 28.42a.5.5 0 0 1-.69 0l-3.861-3.683a.5.5 0 0 1 0-.724l1.11-1.059a.5.5 0 0 1 .69 0l2.06 1.967a.5.5 0 0 0 .69 0l4.813-4.592a.5.5 0 0 1 .69 0l1.11 1.06a.5.5 0 0 1 0 .723zm-7.55-4.17a.5.5 0 0 0-.5-.5H17.12a.5.5 0 0 0-.5.5v1.5a.5.5 0 0 0 .5.5h10.79a.5.5 0 0 0 .5-.5zm12.72 7.862a.5.5 0 0 0 0-.724l-1.109-1.059a.5.5 0 0 0-.69 0l-2.716 2.592a.5.5 0 0 1-.69 0l-2.716-2.592a.5.5 0 0 0-.69 0l-1.11 1.06a.5.5 0 0 0 0 .723l2.648 2.526a.5.5 0 0 1 0 .724l-2.648 2.526a.5.5 0 0 0 0 .724l1.11 1.059a.5.5 0 0 0 .69 0l2.716-2.592a.5.5 0 0 1 .69 0l2.716 2.592a.5.5 0 0 0 .69 0l1.11-1.06a.5.5 0 0 0 0-.723l-2.648-2.526a.5.5 0 0 1 0-.724zM28.41 34.25a.5.5 0 0 0-.5-.5H17.12a.5.5 0 0 0-.5.5v1.5a.5.5 0 0 0 .5.5h10.79a.5.5 0 0 0 .5-.5z"></path></svg><span>5. Security and privacy</span></header><section><p>Learn how to protect data from unauthorized access and how to treat user data responsibly.</p><p>Best Practices</p></section></a></li><li class="module-list-item topic-practices"><a href="/en-US/curriculum/extensions/testing/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-practices"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#356A1C" d="M35.96 28.42a.5.5 0 0 1-.69 0l-3.861-3.683a.5.5 0 0 1 0-.724l1.11-1.059a.5.5 0 0 1 .69 0l2.06 1.967a.5.5 0 0 0 .69 0l4.813-4.592a.5.5 0 0 1 .69 0l1.11 1.06a.5.5 0 0 1 0 .723zm-7.55-4.17a.5.5 0 0 0-.5-.5H17.12a.5.5 0 0 0-.5.5v1.5a.5.5 0 0 0 .5.5h10.79a.5.5 0 0 0 .5-.5zm12.72 7.862a.5.5 0 0 0 0-.724l-1.109-1.059a.5.5 0 0 0-.69 0l-2.716 2.592a.5.5 0 0 1-.69 0l-2.716-2.592a.5.5 0 0 0-.69 0l-1.11 1.06a.5.5 0 0 0 0 .723l2.648 2.526a.5.5 0 0 1 0 .724l-2.648 2.526a.5.5 0 0 0 0 .724l1.11 1.059a.5.5 0 0 0 .69 0l2.716-2.592a.5.5 0 0 1 .69 0l2.716 2.592a.5.5 0 0 0 .69 0l1.11-1.06a.5.5 0 0 0 0-.723l-2.648-2.526a.5.5 0 0 1 0-.724zM28.41 34.25a.5.5 0 0 0-.5-.5H17.12a.5.5 0 0 0-.5.5v1.5a.5.5 0 0 0 .5.5h10.79a.5.5 0 0 0 .5-.5z"></path></svg><span>6. Testing</span></header><section><p>Explore the need for testing, and learn how to implement common test types.</p><p>Best Practices</p></section></a></li><li class="module-list-item topic-tooling"><a href="/en-US/curriculum/extensions/a-practical-understanding-of-javascript-frameworks/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-tooling"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#481C6A" d="M32.57 33.768a.5.5 0 0 0 .004.703l6.793 6.793a.5.5 0 0 0 .71-.004l1.94-1.985a.5.5 0 0 0-.005-.703L35.22 31.78a.5.5 0 0 0-.71.004zm4.304-6.146c-.369 0-.76-.036-1.107-.13a.57.57 0 0 0-.556.13L21.565 41.207a.5.5 0 0 1-.706 0l-1.931-1.931a.5.5 0 0 1 0-.708l8.556-8.544a.5.5 0 0 0 0-.706l-1.511-1.52a.5.5 0 0 0-.703-.006l-.197.191a.5.5 0 0 1-.697 0l-.616-.599a.5.5 0 0 0-.848.359v2.184a.5.5 0 0 1-.147.354l-.373.373a.5.5 0 0 1-.709-.002l-3.697-3.74a.5.5 0 0 1 .002-.704l.377-.377a.5.5 0 0 1 .354-.147h2.104a.5.5 0 0 0 .355-.852l-.553-.557a.5.5 0 0 1 .002-.705l4.097-4.098a3.72 3.72 0 0 1 4.904-.326c.217.167.217.483.026.68l-1.946 1.991a.5.5 0 0 0 .006.704l1.054 1.047a.5.5 0 0 1 .001.709l-.178.178a.5.5 0 0 0 .001.708l1.523 1.514a.5.5 0 0 0 .712-.007l1.692-1.748a.57.57 0 0 0 .122-.55 4.1 4.1 0 0 1-.142-1.088c0-2.462 1.95-4.4 4.375-4.4q.755 0 1.398.246c.304.115.353.503.123.734l-2.53 2.53a.5.5 0 0 0 0 .706l1.168 1.168a.5.5 0 0 0 .707 0l2.53-2.53c.23-.23.619-.181.735.123.163.425.244.887.244 1.423 0 2.4-1.937 4.338-4.375 4.338"></path></svg><span>7. JavaScript frameworks</span></header><section><p>Study the features of popular JavaScript frameworks, and use them to implement common use cases.</p><p>Tooling</p></section></a></li><li class="module-list-item topic-tooling"><a href="/en-US/curriculum/extensions/css-tooling/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-tooling"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#481C6A" d="M32.57 33.768a.5.5 0 0 0 .004.703l6.793 6.793a.5.5 0 0 0 .71-.004l1.94-1.985a.5.5 0 0 0-.005-.703L35.22 31.78a.5.5 0 0 0-.71.004zm4.304-6.146c-.369 0-.76-.036-1.107-.13a.57.57 0 0 0-.556.13L21.565 41.207a.5.5 0 0 1-.706 0l-1.931-1.931a.5.5 0 0 1 0-.708l8.556-8.544a.5.5 0 0 0 0-.706l-1.511-1.52a.5.5 0 0 0-.703-.006l-.197.191a.5.5 0 0 1-.697 0l-.616-.599a.5.5 0 0 0-.848.359v2.184a.5.5 0 0 1-.147.354l-.373.373a.5.5 0 0 1-.709-.002l-3.697-3.74a.5.5 0 0 1 .002-.704l.377-.377a.5.5 0 0 1 .354-.147h2.104a.5.5 0 0 0 .355-.852l-.553-.557a.5.5 0 0 1 .002-.705l4.097-4.098a3.72 3.72 0 0 1 4.904-.326c.217.167.217.483.026.68l-1.946 1.991a.5.5 0 0 0 .006.704l1.054 1.047a.5.5 0 0 1 .001.709l-.178.178a.5.5 0 0 0 .001.708l1.523 1.514a.5.5 0 0 0 .712-.007l1.692-1.748a.57.57 0 0 0 .122-.55 4.1 4.1 0 0 1-.142-1.088c0-2.462 1.95-4.4 4.375-4.4q.755 0 1.398.246c.304.115.353.503.123.734l-2.53 2.53a.5.5 0 0 0 0 .706l1.168 1.168a.5.5 0 0 0 .707 0l2.53-2.53c.23-.23.619-.181.735.123.163.425.244.887.244 1.423 0 2.4-1.937 4.338-4.375 4.338"></path></svg><span>8. CSS tooling</span></header><section><p>Look at popular CSS tooling and understand what code problems they can solve.</p><p>Tooling</p></section></a></li><li class="module-list-item topic-tooling"><a href="/en-US/curriculum/extensions/other-tooling-types/"><header><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 60 60" role="none" class="topic-icon topic-tooling"><circle cx="30" cy="30" r="30" fill="#fff"></circle><path fill="#481C6A" d="M32.57 33.768a.5.5 0 0 0 .004.703l6.793 6.793a.5.5 0 0 0 .71-.004l1.94-1.985a.5.5 0 0 0-.005-.703L35.22 31.78a.5.5 0 0 0-.71.004zm4.304-6.146c-.369 0-.76-.036-1.107-.13a.57.57 0 0 0-.556.13L21.565 41.207a.5.5 0 0 1-.706 0l-1.931-1.931a.5.5 0 0 1 0-.708l8.556-8.544a.5.5 0 0 0 0-.706l-1.511-1.52a.5.5 0 0 0-.703-.006l-.197.191a.5.5 0 0 1-.697 0l-.616-.599a.5.5 0 0 0-.848.359v2.184a.5.5 0 0 1-.147.354l-.373.373a.5.5 0 0 1-.709-.002l-3.697-3.74a.5.5 0 0 1 .002-.704l.377-.377a.5.5 0 0 1 .354-.147h2.104a.5.5 0 0 0 .355-.852l-.553-.557a.5.5 0 0 1 .002-.705l4.097-4.098a3.72 3.72 0 0 1 4.904-.326c.217.167.217.483.026.68l-1.946 1.991a.5.5 0 0 0 .006.704l1.054 1.047a.5.5 0 0 1 .001.709l-.178.178a.5.5 0 0 0 .001.708l1.523 1.514a.5.5 0 0 0 .712-.007l1.692-1.748a.57.57 0 0 0 .122-.55 4.1 4.1 0 0 1-.142-1.088c0-2.462 1.95-4.4 4.375-4.4q.755 0 1.398.246c.304.115.353.503.123.734l-2.53 2.53a.5.5 0 0 0 0 .706l1.168 1.168a.5.5 0 0 0 .707 0l2.53-2.53c.23-.23.619-.181.735.123.163.425.244.887.244 1.423 0 2.4-1.937 4.338-4.375 4.338"></path></svg><span>9. Other tooling types</span></header><section><p>Understand the purpose and usage of other tooling types commonly found in a web project.</p><p>Tooling</p></section></a></li></ol></section><section class="curriculum-prev-next"><a href="/en-US/curriculum/core/" target="_self" class="button primary has-icon"><span class="button-wrap"><span class="icon icon-curriculum-prev "></span>Previous: Core modules</span></a></section></article></main></div><footer id="nav-footer" class="page-footer"><div class="page-footer-grid"><div class="page-footer-logo-col"><a href="/" class="mdn-footer-logo" aria-label="MDN homepage"><svg width="48" height="17" viewBox="0 0 48 17" fill="none" xmlns="http://www.w3.org/2000/svg"><title id="mdn-footer-logo-svg">MDN logo</title><path d="M20.04 16.512H15.504V10.416C15.504 9.488 15.344 8.824 15.024 8.424C14.72 8.024 14.264 7.824 13.656 7.824C12.92 7.824 12.384 8.064 12.048 8.544C11.728 9.024 11.568 9.64 11.568 10.392V14.184H13.008V16.512H8.472V10.416C8.472 9.488 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