Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-anchor-position/anchor-scroll-update-010.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html class="reftest-wait">
<title>Anchored element should update when the nearest scroll container under `contain: layout size` element changes.</title>
<link rel="author" href="mailto:dshin@mozilla.com">
<link rel="match" href="reference/anchor-scroll-update-010-ref.html">
<style>
.anchor {
width: 20px;
height: 20px;
background: magenta;
}
.positioned {
position-anchor: --a;
position: absolute;
background: purple;
width: 20px;
height: 20px;
/* Initially not part of --a's nearest scroll container */
left: anchor(--b right);
top: anchor(--b top);
}
.abs-cb {
position: relative;
width: 200px;
height: 200px;
border: 1px solid;
}
.scroll {
overflow: scroll;
}
.outer {
width: 200px;
height: 200px;
}
.inner {
width: 150px;
height: 150px;
}
.filler {
width: 1px;
height: 200px;
}
.contain {
contain: layout size;
width: 200px;
height: 200px;
}
</style>
<div class=abs-cb>
<div class=contain>
<div id=outer class="scroll outer">
<div class=filler></div>
<div class=anchor style="anchor-name: --b"></div>
<div id=inner class="scroll inner">
<div class=anchor style="anchor-name: --a"></div>
</div>
</div>
</div>
<div class=positioned></div>
</div>
<script>
inner.classList.toggle('scroll');
outer.scrollTop = 100;
function raf() {
return new Promise(resolve => requestAnimationFrame(resolve));
}
async function runTest() {
await raf();
await raf();
document.documentElement.classList.remove('reftest-wait');
}
runTest();
</script>
</html>