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Animations","motion-accessibility-prefers-reduced-motion-performance",{"data":647},[648,651,655,660,665],{"name":335,"slug":336,"description":649,"post_count":23,"subcategories":650},"Learn CSS with practical tutorials and examples covering layouts, Flexbox, Grid, responsive design, typography, positioning, animations, and more.",[],{"name":10,"slug":652,"description":653,"post_count":23,"subcategories":654},"html","Learn HTML with practical tutorials and examples for beginners. Explore HTML tags, elements, attributes, links, images, forms, semantic HTML, and more with clear explanations and real code examples.",[],{"name":656,"slug":657,"description":658,"post_count":9,"subcategories":659},"WPF","wpf","Learn WPF with practical tutorials and examples covering XAML, windows, controls, layouts, data binding, MVVM, commands, styles, templates, debugging, and modern WPF UI development.",[],{"name":661,"slug":662,"description":663,"post_count":9,"subcategories":664},"Python","python","Learn Python with practical tutorials covering strings, lists, functions, exceptions, files, packages, virtual environments, modules, classes, and beginner programming concepts.",[],{"name":666,"slug":667,"description":668,"post_count":9,"subcategories":669},"Java","java","Learn Java with practical tutorials and examples for beginners. Explore Java syntax, variables, data types, classes, objects, methods, inheritance, exceptions, collections, and more with clear explanations and real code examples.",[],{"data":671},{"id":635,"title":636,"slug":637,"content":672,"course":673,"subcategory":674,"author":675,"reading_time_minutes":39,"cornerstone":26,"schema_type":681,"faq_json":5,"video_url":5,"canonical_url":682,"meta_title":683,"meta_description":684,"og_image":5,"toc_json":685,"code_examples":718,"quiz":5,"exercises":732,"published_at":5,"updated_at":740,"prev":741,"next":742},"\u003Ch2 id=\"what-are-scroll-driven-animations\">What are scroll-driven animations?\u003C\u002Fh2>\u003Cp>\u003Cstrong>CSS scroll-driven animations\u003C\u002Fstrong> link the progress of an animation to scrolling instead of time. Scroll down and the animation plays forward; scroll up and it plays backward. You get reading progress bars, reveal-on-scroll effects, parallax and sticky header changes using only CSS, with no \u003Ccode>scroll\u003C\u002Fcode> event listeners or IntersectionObserver. Because they can run off the main thread in supporting browsers, they are often smoother than JavaScript solutions.\u003C\u002Fp>\u003Cp>Focus keyword: \u003Cstrong>CSS scroll-driven animations\u003C\u002Fstrong>. Related trending keywords: \u003Cem>animation-timeline\u003C\u002Fem>, \u003Cem>scroll progress bar CSS\u003C\u002Fem>, \u003Cem>view() timeline\u003C\u002Fem>, \u003Cem>animation-range\u003C\u002Fem>, \u003Cem>scroll reveal animation without JavaScript\u003C\u002Fem>, \u003Cem>CSS parallax\u003C\u002Fem>, \u003Cem>scroll-timeline\u003C\u002Fem>, \u003Cem>view-timeline\u003C\u002Fem>.\u003C\u002Fp>\u003Ch2 id=\"two-kinds-of-timelines\">Two kinds of timelines\u003C\u002Fh2>\u003Cul>\u003Cli>\u003Cstrong>Scroll progress timeline\u003C\u002Fstrong>: progress equals how far a scroll container has been scrolled (0% at the top, 100% at the bottom). Created with \u003Ccode>scroll()\u003C\u002Fcode> or \u003Ccode>scroll-timeline\u003C\u002Fcode>. Best for page progress bars and parallax.\u003C\u002Fli>\u003Cli>\u003Cstrong>View progress timeline\u003C\u002Fstrong>: progress equals how much an element has moved through the scrollport (from entering to leaving). Created with \u003Ccode>view()\u003C\u002Fcode> or \u003Ccode>view-timeline\u003C\u002Fcode>. Best for reveal-on-scroll and per-element effects.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"the-core-syntax\">The core syntax\u003C\u002Fh2>\u003Cp>1) Write normal \u003Ccode>@keyframes\u003C\u002Fcode>. 2) Attach them with \u003Ccode>animation\u003C\u002Fcode> (duration is ignored by scroll timelines, but set \u003Ccode>linear\u003C\u002Fcode> easing in most cases). 3) Set \u003Ccode>animation-timeline\u003C\u002Fcode>.\u003C\u002Fp>\u003Cul>\u003Cli>\u003Ccode>animation-timeline: scroll()\u003C\u002Fcode>: nearest ancestor scroller. Arguments: scroller (\u003Ccode>nearest\u003C\u002Fcode>, \u003Ccode>root\u003C\u002Fcode>, \u003Ccode>self\u003C\u002Fcode>) and axis (\u003Ccode>block\u003C\u002Fcode>, \u003Ccode>inline\u003C\u002Fcode>, \u003Ccode>y\u003C\u002Fcode>, \u003Ccode>x\u003C\u002Fcode>). Example: \u003Ccode>scroll(root block)\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>\u003Ccode>animation-timeline: view()\u003C\u002Fcode>: progress based on the element's own visibility in the scrollport. You can add an axis and an inset.\u003C\u002Fli>\u003Cli>\u003Cstrong>Named timelines\u003C\u002Fstrong>: \u003Ccode>scroll-timeline-name: --page\u003C\u002Fcode> on a scroller, or \u003Ccode>view-timeline-name: --card\u003C\u002Fcode> on a subject, then \u003Ccode>animation-timeline: --page\u003C\u002Fcode> elsewhere. Use \u003Ccode>timeline-scope\u003C\u002Fcode> to share a timeline with elements that are not descendants.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"animation-range-choose-when-it-plays\">animation-range: choose when it plays\u003C\u002Fh2>\u003Cp>The \u003Ccode>animation-range\u003C\u002Fcode> property limits which part of the timeline drives the animation. For view timelines you can use named ranges:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Ccode>entry\u003C\u002Fcode>: while the element is entering the scrollport.\u003C\u002Fli>\u003Cli>\u003Ccode>exit\u003C\u002Fcode>: while it is leaving.\u003C\u002Fli>\u003Cli>\u003Ccode>cover\u003C\u002Fcode>: from first touching to fully leaving.\u003C\u002Fli>\u003Cli>\u003Ccode>contain\u003C\u002Fcode>: while fully visible inside the scrollport.\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Example: \u003Ccode>animation-range: entry 0% entry 100%;\u003C\u002Fcode> makes a reveal finish exactly when the element is fully in view. You can also use \u003Ccode>animation-range: entry 10% cover 40%\u003C\u002Fcode>, or plain lengths and percentages.\u003C\u002Fp>\u003Ch2 id=\"progressive-enhancement-and-fallback\">Progressive enhancement and fallback\u003C\u002Fh2>\u003Cp>Support is excellent in Chromium browsers and is rolling out to others, so treat scroll-driven animation as an enhancement. Wrap it in \u003Ccode>@supports (animation-timeline: scroll())\u003C\u002Fcode>, and make sure the page works with no animation at all. A good rule: elements must be visible and usable by default, and only hidden (for example with \u003Ccode>opacity: 0\u003C\u002Fcode>) inside the \u003Ccode>@supports\u003C\u002Fcode> block. Check current browser support on Can I use before relying on it for essential UI.\u003C\u002Fp>\u003Ch2 id=\"accessibility-and-performance\">Accessibility and performance\u003C\u002Fh2>\u003Cul>\u003Cli>Wrap movement-heavy effects in \u003Ccode>@media (prefers-reduced-motion: no-preference)\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>Animate \u003Ccode>transform\u003C\u002Fcode>, \u003Ccode>opacity\u003C\u002Fcode> and \u003Ccode>clip-path\u003C\u002Fcode>. Avoid properties that trigger layout.\u003C\u002Fli>\u003Cli>Avoid parallax that moves large areas quickly, because it can trigger motion sickness.\u003C\u002Fli>\u003Cli>Do not tie critical information (like form errors) to scroll-only reveals.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"common-mistakes\">Common mistakes\u003C\u002Fh2>\u003Cul>\u003Cli>Setting the \u003Ccode>animation\u003C\u002Fcode> shorthand after \u003Ccode>animation-timeline\u003C\u002Fcode>. The shorthand resets the timeline, so declare \u003Ccode>animation-timeline\u003C\u002Fcode> \u003Cem>after\u003C\u002Fem> it.\u003C\u002Fli>\u003Cli>Forgetting \u003Ccode>animation-fill-mode: both\u003C\u002Fcode>, so elements flash back to their original state outside the range.\u003C\u002Fli>\u003Cli>Expecting time-based easing. Use \u003Ccode>linear\u003C\u002Fcode> so the animation tracks scroll position exactly.\u003C\u002Fli>\u003Cli>Using \u003Ccode>overflow: hidden\u003C\u002Fcode> on the wrong ancestor, which makes it the nearest scroller instead of the page.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"quick-summary\">Quick summary\u003C\u002Fh2>\u003Cp>\u003Cstrong>CSS scroll-driven animations\u003C\u002Fstrong> use \u003Ccode>animation-timeline\u003C\u002Fcode> with \u003Ccode>scroll()\u003C\u002Fcode> or \u003Ccode>view()\u003C\u002Fcode> to bind keyframes to scrolling, and \u003Ccode>animation-range\u003C\u002Fcode> to choose when they play. Always add \u003Ccode>@supports\u003C\u002Fcode> and reduced-motion guards.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  .bar { position: fixed; top: 0; left: 0; width: 100%; height: 6px; background: #6366f1; z-index: 10; transform-origin: 0 50%; transform: scaleX(0); }\n  @supports (animation-timeline: scroll()) {\n    .bar { animation: grow linear both; animation-timeline: scroll(root block); }\n  }\n  @keyframes grow { to { transform: scaleX(1); } }\n  article { max-width: 560px; margin: 0 auto; padding: 30px 20px; line-height: 1.7; }\n<\u002Fstyle>\n<div class='bar'><\u002Fdiv>\n<article id='art'><\u002Farticle>\n<script>\n  var html = '<h1>Reading progress<\u002Fh1>';\n  for (var i = 1; i <= 25; i++) { html += '<p>Paragraph ' + i + '. Scroll down to watch the bar at the top fill up. The animation is driven by scroll position, not by time.<\u002Fp>'; }\n  document.getElementById('art').innerHTML = html;\n<\u002Fscript>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  body { margin: 0; font-family: system-ui, sans-serif; background: #f8fafc; }\n  .spacer { height: 70vh; display: grid; place-items: center; color: #64748b; }\n  .card { width: min(420px, 90%); margin: 0 auto 40px; padding: 28px; border-radius: 16px; background: #fff; box-shadow: 0 10px 30px rgba(0,0,0,.08); }\n  @supports (animation-timeline: view()) {\n    @media (prefers-reduced-motion: no-preference) {\n      .card { animation: reveal linear both; animation-timeline: view(); animation-range: entry 0% entry 100%; }\n    }\n  }\n  @keyframes reveal { from { opacity: 0; transform: translateY(60px) scale(.95); } to { opacity: 1; transform: none; } }\n<\u002Fstyle>\n<div class='spacer'>Scroll down<\u002Fdiv>\n<div class='card'><h3>Card one<\u002Fh3><p>Fades and slides in as it enters the viewport.<\u002Fp><\u002Fdiv>\n<div class='card'><h3>Card two<\u002Fh3><p>No JavaScript or IntersectionObserver needed.<\u002Fp><\u002Fdiv>\n<div class='card'><h3>Card three<\u002Fh3><p>Content stays visible in browsers without support.<\u002Fp><\u002Fdiv>\n<div class='card'><h3>Card four<\u002Fh3><p>That is progressive enhancement.<\u002Fp><\u002Fdiv>\n<div class='spacer'><\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  .hero { height: 60vh; overflow: hidden; position: relative; display: grid; place-items: center; background: #0f172a; color: #fff; }\n  .hero .bg { position: absolute; inset: -20% 0; background: radial-gradient(circle at 30% 30%, #6366f1, transparent 60%), radial-gradient(circle at 70% 70%, #ec4899, transparent 55%); }\n  .hero h1 { position: relative; margin: 0; font-size: 36px; }\n  @supports (animation-timeline: view()) {\n    @media (prefers-reduced-motion: no-preference) {\n      .hero .bg { animation: parallax linear both; animation-timeline: view(); animation-range: cover; }\n    }\n  }\n  @keyframes parallax { from { transform: translateY(-15%); } to { transform: translateY(15%); } }\n  .content { height: 120vh; padding: 30px; }\n<\u002Fstyle>\n<div class='content'>Scroll down a little to see the parallax hero.<\u002Fdiv>\n<div class='hero'><div class='bg'><\u002Fdiv><h1>Subtle CSS parallax<\u002Fh1><\u002Fdiv>\n<div class='content'>Keep parallax movement small for comfort.<\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  .scroller { width: 360px; height: 220px; overflow-y: auto; border: 2px solid #cbd5e1; border-radius: 12px; margin: 20px; position: relative; scroll-timeline: --box block; }\n  .meter { position: sticky; top: 0; height: 6px; background: #10b981; transform-origin: 0 50%; transform: scaleX(0); }\n  @supports (animation-timeline: scroll()) {\n    .meter { animation: fill linear both; animation-timeline: --box; }\n  }\n  @keyframes fill { to { transform: scaleX(1); } }\n  .scroller p { padding: 0 14px; line-height: 1.6; }\n<\u002Fstyle>\n<div class='scroller'>\n  <div class='meter'><\u002Fdiv>\n  <p>Named scroll timeline on an inner scroll container.<\u002Fp>\n  <p>The meter reads the progress of this box, not the page.<\u002Fp>\n  <p>Keep scrolling inside this box.<\u002Fp>\n  <p>The timeline name is --box.<\u002Fp>\n  <p>Use timeline-scope to share names across siblings.<\u002Fp>\n  <p>Almost there.<\u002Fp>\n  <p>The end.<\u002Fp>\n<\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>",{"name":335,"slug":336},{"name":615,"slug":616},{"slug":676,"display_name":677,"job_title":5,"short_bio":5,"expertise_tags":678,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":679,"posts":680},"badar-khalil","Badar Khalil",[],[],[],"Article","https:\u002F\u002Fwpfsharp.com\u002Ftopics\u002Fcss-scroll-driven-animations","CSS Scroll-Driven Animations: scroll() & view() Guide","Learn CSS scroll-driven animations with animation-timeline, scroll(), view(), animation-range, progress bars and reveal effects. Includes fallbacks.",[686,690,694,698,702,706,710,714],{"id":687,"text":688,"level":23,"children":689},"what-are-scroll-driven-animations","What are scroll-driven animations?",[],{"id":691,"text":692,"level":23,"children":693},"two-kinds-of-timelines","Two kinds of timelines",[],{"id":695,"text":696,"level":23,"children":697},"the-core-syntax","The core syntax",[],{"id":699,"text":700,"level":23,"children":701},"animation-range-choose-when-it-plays","animation-range: choose when it plays",[],{"id":703,"text":704,"level":23,"children":705},"progressive-enhancement-and-fallback","Progressive enhancement and fallback",[],{"id":707,"text":708,"level":23,"children":709},"accessibility-and-performance","Accessibility and performance",[],{"id":711,"text":712,"level":23,"children":713},"common-mistakes","Common mistakes",[],{"id":715,"text":716,"level":23,"children":717},"quick-summary","Quick summary",[],[719,723,726,729],{"id":720,"language":652,"code":721,"is_editable":722},591,"\u003Cstyle>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  .bar { position: fixed; top: 0; left: 0; width: 100%; height: 6px; background: #6366f1; z-index: 10; transform-origin: 0 50%; transform: scaleX(0); }\n  @supports (animation-timeline: scroll()) {\n    .bar { animation: grow linear both; animation-timeline: scroll(root block); }\n  }\n  @keyframes grow { to { transform: scaleX(1); } }\n  article { max-width: 560px; margin: 0 auto; padding: 30px 20px; line-height: 1.7; }\n\u003C\u002Fstyle>\n\u003Cdiv class='bar'>\u003C\u002Fdiv>\n\u003Carticle id='art'>\u003C\u002Farticle>\n\u003Cscript>\n  var html = '\u003Ch1>Reading progress\u003C\u002Fh1>';\n  for (var i = 1; i \u003C= 25; i++) { html += '\u003Cp>Paragraph ' + i + '. Scroll down to watch the bar at the top fill up. The animation is driven by scroll position, not by time.\u003C\u002Fp>'; }\n  document.getElementById('art').innerHTML = html;\n\u003C\u002Fscript>",true,{"id":724,"language":652,"code":725,"is_editable":722},592,"\u003Cstyle>\n  body { margin: 0; font-family: system-ui, sans-serif; background: #f8fafc; }\n  .spacer { height: 70vh; display: grid; place-items: center; color: #64748b; }\n  .card { width: min(420px, 90%); margin: 0 auto 40px; padding: 28px; border-radius: 16px; background: #fff; box-shadow: 0 10px 30px rgba(0,0,0,.08); }\n  @supports (animation-timeline: view()) {\n    @media (prefers-reduced-motion: no-preference) {\n      .card { animation: reveal linear both; animation-timeline: view(); animation-range: entry 0% entry 100%; }\n    }\n  }\n  @keyframes reveal { from { opacity: 0; transform: translateY(60px) scale(.95); } to { opacity: 1; transform: none; } }\n\u003C\u002Fstyle>\n\u003Cdiv class='spacer'>Scroll down\u003C\u002Fdiv>\n\u003Cdiv class='card'>\u003Ch3>Card one\u003C\u002Fh3>\u003Cp>Fades and slides in as it enters the viewport.\u003C\u002Fp>\u003C\u002Fdiv>\n\u003Cdiv class='card'>\u003Ch3>Card two\u003C\u002Fh3>\u003Cp>No JavaScript or IntersectionObserver needed.\u003C\u002Fp>\u003C\u002Fdiv>\n\u003Cdiv class='card'>\u003Ch3>Card three\u003C\u002Fh3>\u003Cp>Content stays visible in browsers without support.\u003C\u002Fp>\u003C\u002Fdiv>\n\u003Cdiv class='card'>\u003Ch3>Card four\u003C\u002Fh3>\u003Cp>That is progressive enhancement.\u003C\u002Fp>\u003C\u002Fdiv>\n\u003Cdiv class='spacer'>\u003C\u002Fdiv>",{"id":727,"language":652,"code":728,"is_editable":722},593,"\u003Cstyle>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  .hero { height: 60vh; overflow: hidden; position: relative; display: grid; place-items: center; background: #0f172a; color: #fff; }\n  .hero .bg { position: absolute; inset: -20% 0; background: radial-gradient(circle at 30% 30%, #6366f1, transparent 60%), radial-gradient(circle at 70% 70%, #ec4899, transparent 55%); }\n  .hero h1 { position: relative; margin: 0; font-size: 36px; }\n  @supports (animation-timeline: view()) {\n    @media (prefers-reduced-motion: no-preference) {\n      .hero .bg { animation: parallax linear both; animation-timeline: view(); animation-range: cover; }\n    }\n  }\n  @keyframes parallax { from { transform: translateY(-15%); } to { transform: translateY(15%); } }\n  .content { height: 120vh; padding: 30px; }\n\u003C\u002Fstyle>\n\u003Cdiv class='content'>Scroll down a little to see the parallax hero.\u003C\u002Fdiv>\n\u003Cdiv class='hero'>\u003Cdiv class='bg'>\u003C\u002Fdiv>\u003Ch1>Subtle CSS parallax\u003C\u002Fh1>\u003C\u002Fdiv>\n\u003Cdiv class='content'>Keep parallax movement small for comfort.\u003C\u002Fdiv>",{"id":730,"language":652,"code":731,"is_editable":722},594,"\u003Cstyle>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  .scroller { width: 360px; height: 220px; overflow-y: auto; border: 2px solid #cbd5e1; border-radius: 12px; margin: 20px; position: relative; scroll-timeline: --box block; }\n  .meter { position: sticky; top: 0; height: 6px; background: #10b981; transform-origin: 0 50%; transform: scaleX(0); }\n  @supports (animation-timeline: scroll()) {\n    .meter { animation: fill linear both; animation-timeline: --box; }\n  }\n  @keyframes fill { to { transform: scaleX(1); } }\n  .scroller p { padding: 0 14px; line-height: 1.6; }\n\u003C\u002Fstyle>\n\u003Cdiv class='scroller'>\n  \u003Cdiv class='meter'>\u003C\u002Fdiv>\n  \u003Cp>Named scroll timeline on an inner scroll container.\u003C\u002Fp>\n  \u003Cp>The meter reads the progress of this box, not the page.\u003C\u002Fp>\n  \u003Cp>Keep scrolling inside this box.\u003C\u002Fp>\n  \u003Cp>The timeline name is --box.\u003C\u002Fp>\n  \u003Cp>Use timeline-scope to share names across siblings.\u003C\u002Fp>\n  \u003Cp>Almost there.\u003C\u002Fp>\n  \u003Cp>The end.\u003C\u002Fp>\n\u003C\u002Fdiv>",[733],{"id":734,"title":735,"slug":736,"prompt":737,"starter_code":738,"expected_output":739,"language":652,"order_index":9},209,"Shrink a sticky header on scroll","scroll-shrink-header","Use animation-timeline: scroll() to shrink the header padding from 24px to 8px and reduce its font size while the user scrolls the first 150px. Use animation-range with lengths, wrap it in @supports, and disable it for users who prefer reduced motion.","\u003Cstyle>\n  body { margin: 0; font-family: system-ui, sans-serif; }\n  header { position: sticky; top: 0; padding: 24px; background: #0f172a; color: #fff; font-size: 28px; }\n  \u002F* TODO: @keyframes shrink *\u002F\n  \u002F* TODO: @supports + animation-timeline + animation-range: 0 150px *\u002F\n  main { height: 200vh; padding: 20px; }\n\u003C\u002Fstyle>\n\u003Cheader>My Site\u003C\u002Fheader>\n\u003Cmain>Scroll down\u003C\u002Fmain>","As you scroll the first 150px, the sticky header smoothly becomes shorter with a smaller title. Browsers without support show the normal header.","2026-09-30T18:50:34+00:00",{"id":631,"slug":633,"title":632},{"id":639,"slug":641,"title":640}]