scroll-timeline-frame-size-changed.html (1779B)
1 <!DOCTYPE html> 2 <html class="reftest-wait"> 3 <title>The default scroll() timeline when the frame size changed</title> 4 <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-notation"> 5 <link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-timeline"> 6 <meta name="assert" content="CSS animation correctly updates values when using 7 the default scroll() timeline and update the 8 frame size"> 9 <link rel="match" href="scroll-timeline-frame-size-changed-ref.html"> 10 11 <style> 12 @keyframes update { 13 from { transform: translateY(0px); } 14 to { transform: translateY(200px); } 15 } 16 17 html { 18 min-height: 100%; 19 padding-bottom: 100px; 20 } 21 22 #box { 23 width: 100px; 24 height: 100px; 25 background-color: green; 26 animation: update 1s linear; 27 animation-timeline: scroll(); 28 } 29 30 #covered { 31 width: 100px; 32 height: 100px; 33 background-color: red; 34 } 35 36 * { 37 margin-top: 0px; 38 margin-bottom: 0px; 39 } 40 </style> 41 42 <div id="box"></div> 43 <div id="covered"></div> 44 45 <script src="/web-animations/testcommon.js"></script> 46 <script> 47 document.documentElement.addEventListener('TestRendered', async () => { 48 runTest(); 49 }, { once: true }); 50 51 async function runTest() { 52 const scroller = document.scrollingElement; 53 54 await waitForCompositorReady(); 55 56 // Move the scroller to the 25% point. 57 const maxScroll = scroller.scrollHeight - scroller.clientHeight; 58 scroller.scrollTop = 0.25 * maxScroll; 59 await waitForNextFrame(); 60 61 // Update scroll range to make the current position become 50% point. 62 scroller.style.paddingBottom = "50px"; 63 await waitForNextFrame(); 64 65 document.documentElement.classList.remove("reftest-wait"); 66 } 67 </script>