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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<title>Scroll timeline with inline orientation and root scroller</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<meta name="assert" content="CSS animation correctly updates values when using the inline orientation">
<link rel="match" href="scroll-timeline-inline-orientation-ref.html">
<style>
@keyframes update {
from { transform: translateX(0px); }
to { transform: translateX(200px); }
}
html {
min-width: 100%;
padding-right: 100px;
font-size: 0;
}
#box {
width: 100px;
height: 100px;
background-color: green;
animation: update 1s linear;
animation-timeline: scroll(inline root);
display: inline-block;
}
#covered {
width: 100px;
height: 100px;
background-color: red;
display: inline-block;
}
* {
margin-left: 0px;
margin-right: 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 halfway point.
const maxScroll = scroller.scrollWidth - scroller.clientWidth;
scroller.scrollLeft = 0.5 * maxScroll;
await waitForNextFrame();
await waitForNextFrame();
document.documentElement.classList.remove("reftest-wait");
}
</script>