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exclude-fixed-position.html
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<!DOCTYPE html>
<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/resources/testharnessreport.js"></script>
<style>
body { height:4000px; margin:0; }
#fixed,#content { width:200px; height:100px; }
#fixed { position: fixed; left:100px; top:50px; }
#before { height:50px; }
#content { margin-top:100px; }
</style>
<divid="fixed">fixed</div>
<divid="before"></div>
<divid="content">content</div>
<script>
// Tests that the anchor selection algorithm skips fixed-positioned elements.
test(()=>{
document.scrollingElement.scrollTop=100;
document.querySelector("#before").style.height="100px";
assert_equals(document.scrollingElement.scrollTop,150);
},"Fixed-position header.");
</script>
