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<!DOCTYPE html>
<html class="reftest-wait">
<title>Tests anchor positioning with nested scroll containers</title>
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
<link rel="match" href="reference/anchor-scroll-nested-ref.html">
<style>
body {
margin: 0;
width: 1500px;
height: 1500px;
position: relative;
}
#outer-scroller {
margin: 500px;
width: 350px;
height: 350px;
outline: 1px solid black;
overflow: scroll;
}
#inner-scroller {
margin: 100px;
width: 250px;
height: 250px;
outline: 1px solid black;
overflow: scroll;
}
#anchor {
margin: 200px;
width: 50px;
height: 50px;
background-color: green;
anchor-name: --anchor;
}
.anchored {
position: absolute;
width: 50px;
height: 50px;
left: anchor(--anchor left);
position-anchor: --anchor;
}
.above {
bottom: anchor(--anchor top);
background-color: red;
}
.below {
top: anchor(--anchor bottom);
background-color: yellow;
}
</style>
<div id="outer-scroller">
<div id="inner-scroller">
<div id="anchor"></div>
<div class="anchored above"></div>
</div>
</div>
<div class="anchored below"></div>
<script>
function raf() {
return new Promise(resolve => requestAnimationFrame(resolve));
}
async function runTest() {
await raf();
await raf();
document.documentElement.scrollTop = 400;
document.documentElement.scrollLeft = 400;
let outerScroller = document.getElementById('outer-scroller');
outerScroller.scrollTop = 50;
outerScroller.scrollLeft = 50;
let innerScroller = document.getElementById('inner-scroller');
innerScroller.scrollTop = 100;
innerScroller.scrollLeft = 100;
document.documentElement.classList.remove('reftest-wait');
}
runTest();
</script>
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