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<!DOCTYPE html>
<html class="reftest-wait">
<title>The default scroll() timeline when the frame size changed</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-notation">
<link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-timeline">
<meta name="assert" content="CSS animation correctly updates values when using
the default scroll() timeline and update the
frame size">
<link rel="match" href="scroll-timeline-frame-size-changed-ref.html">
<style>
@keyframes update {
from { transform: translateY(0px); }
to { transform: translateY(200px); }
}
html {
min-height: 100%;
padding-bottom: 100px;
}
#box {
width: 100px;
height: 100px;
background-color: green;
animation: update 1s linear;
animation-timeline: scroll();
}
#covered {
width: 100px;
height: 100px;
background-color: red;
}
* {
margin-top: 0px;
margin-bottom: 0px;
}
</style>
<div id="box"></div>
<div id="covered"></div>
<script src="/web-animations/testcommon.js"></script>
<script>
document.documentElement.addEventListener('TestRendered', async () => {
runTest();
}, { once: true });
async function runTest() {
const scroller = document.scrollingElement;
await waitForCompositorReady();
// Move the scroller to the 25% point.
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.25 * maxScroll;
await waitForNextFrame();
// Update scroll range to make the current position become 50% point.
scroller.style.paddingBottom = "50px";
await waitForNextFrame();
document.documentElement.classList.remove("reftest-wait");
}
</script>
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