<!doctype html>
<script src="../../resources/check-layout.js"></script>
<style> 
    html,body   {margin:0;}
</style> 
<p> THe hr element uses border-box sizing so a 100% width does not create a horizontal scrollbar. </p>
<hr width="100%" size="2" data-expected-width="802">
<script>
    window.checkLayout('hr');
</script>