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<!DOCTYPE html>
<html class=reftest-wait>
<meta charset="utf-8">
<meta name="assert" content="Position-visibility should not be affected by the visibility of a previous anchor." />
<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-change-anchor-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 {
width: 100px;
height: 100px;
background: orange;
display: inline-block;
}
#anchor1 {
height: 200px;
anchor-name: --a1;
}
#anchor2 {
anchor-name: --a2;
}
#target {
position-anchor: --a2;
position-visibility: anchors-visible;
inset-area: bottom;
width: 100px;
height: 100px;
background: green;
position: absolute;
top: 0;
left: 0;
}
</style>
<div id="scroll-container">
<div id="anchor1" class="anchor">anchor1</div>
<div id="anchor2" class="anchor">anchor2</div>
<div id="target">target</div>
</div>
<script>
// #target should be initially visible because it is anchored to #anchor2,
// which is visible.
waitForAtLeastOneFrame().then(() => {
// Change #target to be anchored to #anchor1.
target.style.positionAnchor = '--a1';
// #target should be still be visible because #anchor1 is also visible.
waitForAtLeastOneFrame().then(() => {
// Scroll #anchor2 out of view, with #anchor1 still in view.
const scroller = document.getElementById('scroll-container');
scroller.scrollTop = 100;
// #target should still be visible because it is anchored to #anchor1,
// which is still visible.
takeScreenshot();
});
});
</script>
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