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Test Info:

<!DOCTYPE html>
body {padding: 0;margin:0;}
div {
width: 200px;
height: 200px;
position: fixed;
top: 50px;
left: 50px;
margin: 50px;
padding: 50px;
border: 50px solid red;
transform-origin: 0 0;
transform: translate(50px, 50px) scale(0.5);
background-color: green;
clip-path: polygon(0 0, 200px 0, 0 200px) content-box;
<title>clip-path with polygon() hit test</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<div id="a"></div>
<p style="margin-top: 110px">
var a = document.getElementById("a");
isnot(a, document.elementFromPoint(199, 199), "a shouldn't be found");
isnot(a, document.elementFromPoint(199, 250), "a shouldn't be found");
isnot(a, document.elementFromPoint(250, 199), "a shouldn't be found");
isnot(a, document.elementFromPoint(255, 255), "a shouldn't be found");
isnot(a, document.elementFromPoint(301, 200), "a shouldn't be found");
isnot(a, document.elementFromPoint(200, 301), "a shouldn't be found");
is(a, document.elementFromPoint(200, 200), "a should be found");
is(a, document.elementFromPoint(299, 200), "a should be found");
is(a, document.elementFromPoint(200, 299), "a should be found");
is(a, document.elementFromPoint(250, 250), "a should be found");