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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
<p>There should be a green square below, and no red.</p>
<div style="position:relative; width:100px; height:100px; background:red;">
<span>
<span id="posMe">
<div id="removeMe"></div>
</span>
</span>
<span>
<div>
<div id="target" style="position:absolute; width:100%; height:100%; background:green;"></div>
</div>
</span>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(()=> {
document.body.offsetTop;
removeMe.style.display = "none";
document.body.offsetTop;
posMe.style.position = "relative";
assert_equals(document.getElementById("target").offsetWidth, 100);
assert_equals(document.getElementById("target").offsetHeight, 100);
assert_equals(document.getElementById("target").offsetLeft, 0);
assert_equals(document.getElementById("target").offsetTop, 0);
}, "Make sure that we're sized by the right ancestor");
</script>