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<!DOCTYPE html>
<html class='reftest-wait'>
<title>Sticky elements should invalidate when top/left/bottom/right changes</title>
<link rel="match" href="position-sticky-change-top-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<link rel="help" href="https://crbug.com/939632">
<meta name="assert" content="This test checks that sticky elements are invalidated correctly when top/left/bottom/right change "/>
<script src="/common/reftest-wait.js"></script>
<script src="resources/ref-rectangle.js"></script>
<!--
It is important for this test that the sticky element is viewport-bound, and
that multiple animation frames pass before changing the style.
-->
<style>
.marker {
background: red;
position: absolute;
top: 200px;
height: 100px;
width: 100px;
}
.sticky {
/* Triggers promotion without creating stacking context. */
backface-visibility: hidden;
background: green;
position: sticky;
top: 0;
width: 100px;
height: 100px;
}
.spacer {
height: 200vh;
}
</style>
<div class="marker"></div>
<div class="sticky"></div>
<div class="spacer"></div>
<script>
requestAnimationFrame(() => {
requestAnimationFrame(() => {
document.querySelector('.sticky').style.setProperty('top', '200px');
createIndicatorForStickyElements(document.querySelectorAll('.sticky'));
takeScreenshot();
});
});
</script>
</html>
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