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negative-layout-overflow.html
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<!DOCTYPE html>
<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/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>
<divid="header">
<divid="evil"></div>
</div>
<divid="changer"></div>
<divid="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>
