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<!DOCTYPE html>
<html class='reftest-wait'>
<title>Sticky elements inside fixed ancestors and iframe shouldn't account for scroll</title>
<link rel="match" href="position-sticky-fixed-ancestor-iframe-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<link rel="help" href="https://crbug.com/1019142">
<meta name="assert" content="This test checks that a sticky element inside a fixed subtree and iframe doesn't scroll with the viewport "/>
<script src="/common/reftest-wait.js"></script>
<style>
body,html {
margin: 0;
width: 100%;
height: 100%;
}
iframe {
margin: 10px;
width: 90%;
height: 90%;
border: 1px solid black;
}
.spacer {
height: 120vh;
}
</style>
<div class="spacer"></div>
<iframe src="resources/position-sticky-fixed-ancestor-iframe-child.html"></iframe>
<div class="spacer"></div>
<script>
const child = document.querySelector('iframe');
child.scrollIntoView();
window.onload = () => {
const childDoc = child.contentDocument;
function toggleFixed() {
childDoc.querySelector('.position-parent').classList.toggle('fixed');
}
childDoc.getElementById('button').addEventListener('click', toggleFixed);
requestAnimationFrame(() => {
childDoc.scrollingElement.scrollTop = childDoc.querySelector('.long').clientHeight;
requestAnimationFrame(() => {
toggleFixed();
takeScreenshot();
});
});
};
</script>
</html>
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