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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; }
#outer:after { content: " "; clear:both; display: table; }
#float {
float: left; background-color: #ccc;
height: 500px; width: 100%;
}
#inner { height: 100px; background-color: green; }
</style>
<div id="outer">
<div id="zeroheight">
<div id="float">
<div id="changer"></div>
<div id="inner"></div>
</div>
</div>
</div>
<div>after</div>
<script>
// Tests that we descend into zero-height containers that have floating content.
test(() => {
document.scrollingElement.scrollTop = 50;
assert_equals(document.querySelector("#zeroheight").offsetHeight, 0);
document.querySelector("#changer").style.height = "50px";
assert_equals(document.scrollingElement.scrollTop, 100);
}, "Zero-height container with float.");
</script>
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