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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
height: 1200px;
}
#header {
position: relative;
height: 100px;
}
#evil {
position: relative;
top: -900px;
height: 1000px;
width: 100px;
}
#changer {
height: 100px;
}
#anchor {
height: 100px;
background-color: green;
}
</style>
<div id="header">
<div id="evil"></div>
</div>
<div id="changer"></div>
<div id="anchor"></div>
<script>
// Tests that the anchor selection algorithm correctly accounts for negative
// positioning when computing bounds for visibility.
test(() => {
document.scrollingElement.scrollTop = 250;
document.querySelector("#changer").style.height = "200px";
assert_equals(document.scrollingElement.scrollTop, 350);
}, "Anchor selection accounts for negative positioning.");
</script>
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