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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { height: 4000px; }
#outer { width: 300px; }
#zeroheight { height: 0px; }
#changer { height: 100px; background-color: red; }
#bottom { margin-top: 600px; }
</style>
<div id="outer">
<div id="zeroheight">
<div id="changer"></div>
<div id="bottom">bottom</div>
</div>
</div>
<script>
// Tests that the anchor selection algorithm descends into zero-height
// containers that have overflowing content.
test(() => {
document.scrollingElement.scrollTop = 200;
document.querySelector("#changer").style.height = "200px";
assert_equals(document.scrollingElement.scrollTop, 300);
}, "Zero-height container with visible overflow.");
</script>
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