<!DOCTYPE html>
<html class=reftest-wait>
<meta charset="utf-8">
<meta name="assert" content="Scrolling an anchor in to view should cause a position-visibility: anchors-visible element to appear." />
<title>CSS Anchor Positioning Test: position-visibility: anchors-visible</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
<link rel="match" href="position-visibility-anchors-visible-after-scroll-in-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
#scroll-container {
overflow: hidden scroll;
width: 300px;
height: 100px;
}
#anchor {
anchor-name: --a1;
width: 100px;
height: 100px;
background: orange;
}
#spacer {
height: 100px;
}
#target {
position-anchor: --a1;
position-visibility: anchors-visible;
position-area: block-end;
width: 100px;
height: 100px;
background: green;
position: absolute;
top: 0;
left: 0;
}
</style>
<div id="scroll-container">
<div id="anchor">anchor</div>
<div id="spacer"></div>
<div id="target">target</div>
</div>
<script>
// #target should be initially visible because it is anchored to #anchor,
// which is visible.
waitForAtLeastOneFrame().then(() => {
// Scroll #anchor out of view.
const scroller = document.getElementById('scroll-container');
scroller.scrollTop = 100;
// #target should now be invisible.
waitForAtLeastOneFrame().then(() => {
// Scroll #anchor back into view.
scroller.scrollTop = 0;
// #target should now be visible again.
takeScreenshot();
});
});
</script>
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