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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body, html, #static { height: 0; }
#abs {
position: absolute;
left: 50px;
top: 50px;
height: 1200px;
padding: 50px;
border: 5px solid gray;
}
#anchor {
background-color: #afa;
width: 100px;
height: 100px;
}
</style>
<div id="static">
<div id="abs">
<div id="changer"></div>
<div id="anchor"></div>
</div>
</div>
<script>
// Tests that the "bounds" of an element, for the purpose of visibility in the
// anchor node selection algorithm, include any space occupied by the element's
// positioned descendants.
test(() => {
document.scrollingElement.scrollTop = 120;
document.querySelector("#changer").style.height = "100px";
assert_equals(document.scrollingElement.scrollTop, 220);
}, "Abs-pos with zero-height static parent.");
</script>
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