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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":619,"title":620,"slug":621,"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":722,"quiz":5,"exercises":739,"published_at":5,"updated_at":747,"prev":748,"next":749},"\u003Ch2 id=\"what-are-css-transitions\">What are CSS transitions?\u003C\u002Fh2>\u003Cp>\u003Cstrong>CSS transitions\u003C\u002Fstrong> let the browser animate a property from its old value to its new value over a set time, instead of changing instantly. They are the simplest way to add motion to hover effects, focus rings, menus, cards, buttons and UI state changes. A transition needs only two things: a start state, an end state, and a rule telling the browser how long the change should take.\u003C\u002Fp>\u003Cp>Focus keyword: \u003Cstrong>CSS transitions\u003C\u002Fstrong>. Related trending keywords: \u003Cem>transition-behavior allow-discrete\u003C\u002Fem>, \u003Cem>@starting-style\u003C\u002Fem>, \u003Cem>interpolate-size\u003C\u002Fem>, \u003Cem>linear() easing\u003C\u002Fem>, \u003Cem>CSS micro-interactions\u003C\u002Fem>, \u003Cem>GPU accelerated animation\u003C\u002Fem>, \u003Cem>smooth hover effects\u003C\u002Fem>.\u003C\u002Fp>\u003Ch2 id=\"the-four-transition-longhand-properties\">The four transition longhand properties\u003C\u002Fh2>\u003Cul>\u003Cli>\u003Ccode>transition-property\u003C\u002Fcode>: which property to animate (\u003Ccode>opacity\u003C\u002Fcode>, \u003Ccode>transform\u003C\u002Fcode>, \u003Ccode>background-color\u003C\u002Fcode>, or \u003Ccode>all\u003C\u002Fcode>).\u003C\u002Fli>\u003Cli>\u003Ccode>transition-duration\u003C\u002Fcode>: how long it takes (\u003Ccode>200ms\u003C\u002Fcode>, \u003Ccode>0.3s\u003C\u002Fcode>). Default is \u003Ccode>0s\u003C\u002Fcode>, which means no transition.\u003C\u002Fli>\u003Cli>\u003Ccode>transition-timing-function\u003C\u002Fcode>: the speed curve (\u003Ccode>ease\u003C\u002Fcode>, \u003Ccode>linear\u003C\u002Fcode>, \u003Ccode>ease-in\u003C\u002Fcode>, \u003Ccode>ease-out\u003C\u002Fcode>, \u003Ccode>ease-in-out\u003C\u002Fcode>, \u003Ccode>cubic-bezier()\u003C\u002Fcode>, \u003Ccode>steps()\u003C\u002Fcode>, \u003Ccode>linear()\u003C\u002Fcode>).\u003C\u002Fli>\u003Cli>\u003Ccode>transition-delay\u003C\u002Fcode>: wait time before starting (\u003Ccode>100ms\u003C\u002Fcode>). Negative delays start part-way through.\u003C\u002Fli>\u003C\u002Ful>\u003Cp>The shorthand is \u003Ccode>transition: property duration timing-function delay\u003C\u002Fcode>. You can chain several transitions with commas: \u003Ccode>transition: opacity .3s ease, transform .3s ease-out .05s;\u003C\u002Fcode>. A fifth longhand, \u003Ccode>transition-behavior\u003C\u002Fcode>, is covered below.\u003C\u002Fp>\u003Ch2 id=\"put-the-transition-on-the-base-state\">Put the transition on the base state\u003C\u002Fh2>\u003Cp>Declare the transition on the element's normal rule, not only on \u003Ccode>:hover\u003C\u002Fcode>. If it only exists on \u003Ccode>:hover\u003C\u002Fcode>, the element animates in but snaps back instantly when the pointer leaves. Declaring it on the base state makes both directions smooth. You can also give the return direction a different speed by setting another \u003Ccode>transition\u003C\u002Fcode> in the hover rule.\u003C\u002Fp>\u003Ch2 id=\"timing-functions-and-easing\">Timing functions and easing\u003C\u002Fh2>\u003Cul>\u003Cli>\u003Cstrong>ease\u003C\u002Fstrong> (default): slow start, fast middle, slow end.\u003C\u002Fli>\u003Cli>\u003Cstrong>ease-out\u003C\u002Fstrong>: fast start, gentle stop. Best for elements entering the screen.\u003C\u002Fli>\u003Cli>\u003Cstrong>ease-in\u003C\u002Fstrong>: slow start, fast end. Best for elements leaving.\u003C\u002Fli>\u003Cli>\u003Cstrong>cubic-bezier(x1, y1, x2, y2)\u003C\u002Fstrong>: custom curve. Y values can go beyond 0 to 1 for overshoot (bounce-like) effects.\u003C\u002Fli>\u003Cli>\u003Cstrong>steps(n)\u003C\u002Fstrong>: jumps in n discrete steps, useful for sprite or typewriter effects.\u003C\u002Fli>\u003Cli>\u003Cstrong>linear(...)\u003C\u002Fstrong>: a modern easing function that takes many points, so you can approximate springs and bounces in pure CSS. Example: \u003Ccode>linear(0, 0.5 25%, 1, 0.9 60%, 1)\u003C\u002Fcode>. Generate long lists with an online linear() easing generator.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"what-can-be-transitioned\">What can be transitioned?\u003C\u002Fh2>\u003Cp>Only properties with an interpolable value type can transition: numbers, lengths, percentages, colors, transforms, shadows, and similar. Classic examples include \u003Ccode>opacity\u003C\u002Fcode>, \u003Ccode>transform\u003C\u002Fcode>, \u003Ccode>color\u003C\u002Fcode>, \u003Ccode>background-color\u003C\u002Fcode>, \u003Ccode>width\u003C\u002Fcode>, \u003Ccode>box-shadow\u003C\u002Fcode> and \u003Ccode>filter\u003C\u002Fcode>. Keywords such as \u003Ccode>display\u003C\u002Fcode> and \u003Ccode>height: auto\u003C\u002Fcode> were historically not animatable, which is why developers used \u003Ccode>max-height\u003C\u002Fcode> hacks.\u003C\u002Fp>\u003Ch2 id=\"modern-features-allow-discrete-at-starting-style-and-interpolate-size\">Modern features: allow-discrete, @starting-style and interpolate-size\u003C\u002Fh2>\u003Cul>\u003Cli>\u003Cstrong>transition-behavior: allow-discrete\u003C\u002Fstrong> lets discrete properties like \u003Ccode>display\u003C\u002Fcode> and \u003Ccode>content-visibility\u003C\u002Fcode> take part in a transition. The value flips at the right moment, so an element can fade out before \u003Ccode>display: none\u003C\u002Fcode> is applied.\u003C\u002Fli>\u003Cli>\u003Cstrong>@starting-style\u003C\u002Fstrong> defines the style an element transitions \u003Cem>from\u003C\u002Fem> on its first render, for example when it is added to the DOM or changes from \u003Ccode>display: none\u003C\u002Fcode>. This gives you entry animations with no JavaScript.\u003C\u002Fli>\u003Cli>\u003Cstrong>interpolate-size: allow-keywords\u003C\u002Fstrong> (set on \u003Ccode>:root\u003C\u002Fcode>) lets you transition to and from intrinsic sizes like \u003Ccode>height: auto\u003C\u002Fcode>, \u003Ccode>min-content\u003C\u002Fcode> and \u003Ccode>fit-content\u003C\u002Fcode>. Use it as progressive enhancement, since support is not universal yet.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"best-practices\">Best practices\u003C\u002Fh2>\u003Cul>\u003Cli>Prefer animating \u003Ccode>transform\u003C\u002Fcode> and \u003Ccode>opacity\u003C\u002Fcode>. They are usually handled by the compositor and stay smooth. Animating \u003Ccode>width\u003C\u002Fcode>, \u003Ccode>height\u003C\u002Fcode>, \u003Ccode>top\u003C\u002Fcode> or \u003Ccode>left\u003C\u002Fcode> triggers layout and can cause jank.\u003C\u002Fli>\u003Cli>Avoid \u003Ccode>transition: all\u003C\u002Fcode> in production. It animates properties you did not intend and can hurt performance. List properties explicitly.\u003C\u002Fli>\u003Cli>Keep UI transitions short: about 150ms to 300ms for small controls, up to 500ms for larger movements.\u003C\u002Fli>\u003Cli>Never rely on a transition alone to communicate state. Keep colors, text and ARIA states correct, and respect \u003Ccode>prefers-reduced-motion\u003C\u002Fcode> (see the last topic in this chapter).\u003C\u002Fli>\u003Cli>Transitions fire only when a computed value changes. If an element is inserted with its final styles, nothing animates unless you use \u003Ccode>@starting-style\u003C\u002Fcode>.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"common-mistakes\">Common mistakes\u003C\u002Fh2>\u003Cul>\u003Cli>Forgetting units: \u003Ccode>transition: opacity 0.3\u003C\u002Fcode> is invalid. Use \u003Ccode>0.3s\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>Putting the transition only in \u003Ccode>:hover\u003C\u002Fcode> so the un-hover snaps back.\u003C\u002Fli>\u003Cli>Trying to transition between \u003Ccode>display: none\u003C\u002Fcode> and \u003Ccode>block\u003C\u002Fcode> without \u003Ccode>allow-discrete\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>Expecting transitions to run on page load. They need a change after first render, or \u003Ccode>@starting-style\u003C\u002Fcode>.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"quick-summary\">Quick summary\u003C\u002Fh2>\u003Cp>Use \u003Cstrong>CSS transitions\u003C\u002Fstrong> for simple two-state motion. Reach for keyframe animations when you need multiple steps, looping or automatic playback. Try the interactive examples below and edit the code to see the result instantly.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .btn {\n    padding: 14px 28px;\n    border: 0;\n    border-radius: 10px;\n    background: #4f46e5;\n    color: #fff;\n    font: 600 16px system-ui, sans-serif;\n    cursor: pointer;\n    box-shadow: 0 2px 6px rgba(0,0,0,.2);\n    transition: transform .2s ease-out, background-color .2s ease-out, box-shadow .2s ease-out;\n  }\n  .btn:hover, .btn:focus-visible {\n    background: #6366f1;\n    transform: translateY(-3px);\n    box-shadow: 0 10px 20px rgba(79,70,229,.35);\n  }\n  .btn:active { transform: translateY(0); }\n<\u002Fstyle>\n<button class='btn'>Hover or focus me<\u002Fbutton>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .row { display: flex; flex-direction: column; gap: 10px; font-family: system-ui, sans-serif; }\n  .track { background: #e5e7eb; border-radius: 8px; width: 320px; }\n  .dot { height: 28px; width: 28px; border-radius: 8px; color: #fff; font-size: 11px; display: grid; place-items: center; transition: transform 1.2s; }\n  .t1 .dot { background: #ef4444; transition-timing-function: linear; }\n  .t2 .dot { background: #f59e0b; transition-timing-function: ease-in; }\n  .t3 .dot { background: #10b981; transition-timing-function: ease-out; }\n  .t4 .dot { background: #3b82f6; transition-timing-function: cubic-bezier(.68,-.55,.27,1.55); }\n  .t5 .dot { background: #8b5cf6; transition-timing-function: steps(5); }\n  .go .dot { transform: translateX(292px); }\n<\u002Fstyle>\n<div class='row' id='demo'>\n  <button id='run'>Run \u002F Reset<\u002Fbutton>\n  <div class='track t1'><div class='dot'>lin<\u002Fdiv><\u002Fdiv>\n  <div class='track t2'><div class='dot'>in<\u002Fdiv><\u002Fdiv>\n  <div class='track t3'><div class='dot'>out<\u002Fdiv><\u002Fdiv>\n  <div class='track t4'><div class='dot'>bez<\u002Fdiv><\u002Fdiv>\n  <div class='track t5'><div class='dot'>stp<\u002Fdiv><\u002Fdiv>\n<\u002Fdiv>\n<script>\n  document.getElementById('run').addEventListener('click', function () {\n    document.getElementById('demo').classList.toggle('go');\n  });\n<\u002Fscript>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .ball {\n    width: 60px; height: 60px; border-radius: 50%;\n    background: #ec4899; margin: 20px;\n    \u002F* linear() approximates a bouncy spring in pure CSS *\u002F\n    transition: transform 1s linear(0, 0.22 10%, 0.75 20%, 1 30%, 0.88 40%, 1 50%, 0.96 60%, 1 75%, 1);\n  }\n  .wrap:hover .ball { transform: translateX(240px); }\n  .wrap { font-family: system-ui, sans-serif; padding: 10px; border: 2px dashed #cbd5e1; width: 340px; }\n<\u002Fstyle>\n<div class='wrap'>Hover this box (linear() easing):<div class='ball'><\u002Fdiv><\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .panel {\n    display: none;\n    opacity: 0;\n    transform: translateY(16px);\n    padding: 18px;\n    margin-top: 14px;\n    width: 280px;\n    border-radius: 12px;\n    background: #0ea5e9;\n    color: #fff;\n    font-family: system-ui, sans-serif;\n    transition: opacity .4s ease, transform .4s ease, display .4s allow-discrete;\n  }\n  .panel.open { display: block; opacity: 1; transform: none; }\n  @starting-style {\n    .panel.open { opacity: 0; transform: translateY(16px); }\n  }\n<\u002Fstyle>\n<button id='btn'>Toggle panel<\u002Fbutton>\n<div class='panel' id='panel'>I fade in from display:none and fade out before being hidden.<\u002Fdiv>\n<script>\n  document.getElementById('btn').addEventListener('click', function () {\n    document.getElementById('panel').classList.toggle('open');\n  });\n<\u002Fscript>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  :root { interpolate-size: allow-keywords; }\n  .acc { font-family: system-ui, sans-serif; width: 320px; }\n  .acc button { width: 100%; text-align: left; padding: 12px; border: 0; background: #1f2937; color: #fff; border-radius: 8px; cursor: pointer; }\n  .body { height: 0; overflow: hidden; transition: height .35s ease; background: #f1f5f9; padding: 0 12px; border-radius: 0 0 8px 8px; }\n  .acc.open .body { height: auto; padding: 12px; }\n<\u002Fstyle>\n<div class='acc' id='acc'>\n  <button id='toggle'>Toggle accordion (height: auto)<\u002Fbutton>\n  <div class='body'>With interpolate-size, the browser can animate to height auto. In browsers without support, it simply snaps open, which is a safe fallback.<\u002Fdiv>\n<\u002Fdiv>\n<script>\n  document.getElementById('toggle').addEventListener('click', function () {\n    document.getElementById('acc').classList.toggle('open');\n  });\n<\u002Fscript>\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-transitions","CSS Transitions: Complete Guide with Examples (2026)","Learn CSS transitions: transition shorthand, timing functions, linear(), @starting-style, allow-discrete and height auto animation with live code.",[686,690,694,698,702,706,710,714,718],{"id":687,"text":688,"level":23,"children":689},"what-are-css-transitions","What are CSS transitions?",[],{"id":691,"text":692,"level":23,"children":693},"the-four-transition-longhand-properties","The four transition longhand properties",[],{"id":695,"text":696,"level":23,"children":697},"put-the-transition-on-the-base-state","Put the transition on the base state",[],{"id":699,"text":700,"level":23,"children":701},"timing-functions-and-easing","Timing functions and easing",[],{"id":703,"text":704,"level":23,"children":705},"what-can-be-transitioned","What can be transitioned?",[],{"id":707,"text":708,"level":23,"children":709},"modern-features-allow-discrete-at-starting-style-and-interpolate-size","Modern features: allow-discrete, @starting-style and interpolate-size",[],{"id":711,"text":712,"level":23,"children":713},"best-practices","Best practices",[],{"id":715,"text":716,"level":23,"children":717},"common-mistakes","Common mistakes",[],{"id":719,"text":720,"level":23,"children":721},"quick-summary","Quick summary",[],[723,727,730,733,736],{"id":724,"language":652,"code":725,"is_editable":726},572,"\u003Cstyle>\n  .btn {\n    padding: 14px 28px;\n    border: 0;\n    border-radius: 10px;\n    background: #4f46e5;\n    color: #fff;\n    font: 600 16px system-ui, sans-serif;\n    cursor: pointer;\n    box-shadow: 0 2px 6px rgba(0,0,0,.2);\n    transition: transform .2s ease-out, background-color .2s ease-out, box-shadow .2s ease-out;\n  }\n  .btn:hover, .btn:focus-visible {\n    background: #6366f1;\n    transform: translateY(-3px);\n    box-shadow: 0 10px 20px rgba(79,70,229,.35);\n  }\n  .btn:active { transform: translateY(0); }\n\u003C\u002Fstyle>\n\u003Cbutton class='btn'>Hover or focus me\u003C\u002Fbutton>",true,{"id":728,"language":652,"code":729,"is_editable":726},573,"\u003Cstyle>\n  .row { display: flex; flex-direction: column; gap: 10px; font-family: system-ui, sans-serif; }\n  .track { background: #e5e7eb; border-radius: 8px; width: 320px; }\n  .dot { height: 28px; width: 28px; border-radius: 8px; color: #fff; font-size: 11px; display: grid; place-items: center; transition: transform 1.2s; }\n  .t1 .dot { background: #ef4444; transition-timing-function: linear; }\n  .t2 .dot { background: #f59e0b; transition-timing-function: ease-in; }\n  .t3 .dot { background: #10b981; transition-timing-function: ease-out; }\n  .t4 .dot { background: #3b82f6; transition-timing-function: cubic-bezier(.68,-.55,.27,1.55); }\n  .t5 .dot { background: #8b5cf6; transition-timing-function: steps(5); }\n  .go .dot { transform: translateX(292px); }\n\u003C\u002Fstyle>\n\u003Cdiv class='row' id='demo'>\n  \u003Cbutton id='run'>Run \u002F Reset\u003C\u002Fbutton>\n  \u003Cdiv class='track t1'>\u003Cdiv class='dot'>lin\u003C\u002Fdiv>\u003C\u002Fdiv>\n  \u003Cdiv class='track t2'>\u003Cdiv class='dot'>in\u003C\u002Fdiv>\u003C\u002Fdiv>\n  \u003Cdiv class='track t3'>\u003Cdiv class='dot'>out\u003C\u002Fdiv>\u003C\u002Fdiv>\n  \u003Cdiv class='track t4'>\u003Cdiv class='dot'>bez\u003C\u002Fdiv>\u003C\u002Fdiv>\n  \u003Cdiv class='track t5'>\u003Cdiv class='dot'>stp\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003Cscript>\n  document.getElementById('run').addEventListener('click', function () {\n    document.getElementById('demo').classList.toggle('go');\n  });\n\u003C\u002Fscript>",{"id":731,"language":652,"code":732,"is_editable":726},574,"\u003Cstyle>\n  .ball {\n    width: 60px; height: 60px; border-radius: 50%;\n    background: #ec4899; margin: 20px;\n    \u002F* linear() approximates a bouncy spring in pure CSS *\u002F\n    transition: transform 1s linear(0, 0.22 10%, 0.75 20%, 1 30%, 0.88 40%, 1 50%, 0.96 60%, 1 75%, 1);\n  }\n  .wrap:hover .ball { transform: translateX(240px); }\n  .wrap { font-family: system-ui, sans-serif; padding: 10px; border: 2px dashed #cbd5e1; width: 340px; }\n\u003C\u002Fstyle>\n\u003Cdiv class='wrap'>Hover this box (linear() easing):\u003Cdiv class='ball'>\u003C\u002Fdiv>\u003C\u002Fdiv>",{"id":734,"language":652,"code":735,"is_editable":726},575,"\u003Cstyle>\n  .panel {\n    display: none;\n    opacity: 0;\n    transform: translateY(16px);\n    padding: 18px;\n    margin-top: 14px;\n    width: 280px;\n    border-radius: 12px;\n    background: #0ea5e9;\n    color: #fff;\n    font-family: system-ui, sans-serif;\n    transition: opacity .4s ease, transform .4s ease, display .4s allow-discrete;\n  }\n  .panel.open { display: block; opacity: 1; transform: none; }\n  @starting-style {\n    .panel.open { opacity: 0; transform: translateY(16px); }\n  }\n\u003C\u002Fstyle>\n\u003Cbutton id='btn'>Toggle panel\u003C\u002Fbutton>\n\u003Cdiv class='panel' id='panel'>I fade in from display:none and fade out before being hidden.\u003C\u002Fdiv>\n\u003Cscript>\n  document.getElementById('btn').addEventListener('click', function () {\n    document.getElementById('panel').classList.toggle('open');\n  });\n\u003C\u002Fscript>",{"id":737,"language":652,"code":738,"is_editable":726},576,"\u003Cstyle>\n  :root { interpolate-size: allow-keywords; }\n  .acc { font-family: system-ui, sans-serif; width: 320px; }\n  .acc button { width: 100%; text-align: left; padding: 12px; border: 0; background: #1f2937; color: #fff; border-radius: 8px; cursor: pointer; }\n  .body { height: 0; overflow: hidden; transition: height .35s ease; background: #f1f5f9; padding: 0 12px; border-radius: 0 0 8px 8px; }\n  .acc.open .body { height: auto; padding: 12px; }\n\u003C\u002Fstyle>\n\u003Cdiv class='acc' id='acc'>\n  \u003Cbutton id='toggle'>Toggle accordion (height: auto)\u003C\u002Fbutton>\n  \u003Cdiv class='body'>With interpolate-size, the browser can animate to height auto. In browsers without support, it simply snaps open, which is a safe fallback.\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003Cscript>\n  document.getElementById('toggle').addEventListener('click', function () {\n    document.getElementById('acc').classList.toggle('open');\n  });\n\u003C\u002Fscript>",[740],{"id":741,"title":742,"slug":743,"prompt":744,"starter_code":745,"expected_output":746,"language":652,"order_index":9},205,"Add a smooth hover transition to a card","transition-card-hover","Make the card lift up by 6px, grow its shadow and change its background color on hover and focus-within. Use a transition on the base state only for transform, box-shadow and background-color (do not use transition: all). Keep the duration between 200ms and 300ms and use ease-out.","\u003Cstyle>\n  .card { width: 240px; padding: 20px; border-radius: 12px; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.2); font-family: system-ui, sans-serif; }\n  \u002F* TODO: add transition on .card *\u002F\n  \u002F* TODO: add hover \u002F focus-within styles *\u002F\n\u003C\u002Fstyle>\n\u003Cdiv class='card' tabindex='0'>Hover me\u003C\u002Fdiv>","The card smoothly lifts by 6px with a larger shadow and a new background color on hover, and smoothly returns when the pointer leaves.","2026-09-30T18:50:34+00:00",{"id":611,"slug":613,"title":612},{"id":623,"slug":625,"title":624}]