File: clip-path-element-objectboundingbox-001.html

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<!DOCTYPE html>
<title>Hit-test of clip-path objectBoundingBox &lt;clipPath> with additional transform</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking/#the-clip-path">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
  margin: 0;
}
.box {
  width: 100px;
  height: 100px;
  background-color: blue;
  margin: 100px;
  clip-path: url(#clip);
}
</style>
<div class="box"></div>
<svg height="0">
  <clipPath id="clip" clipPathUnits="objectBoundingBox" transform="scale(0.01, 0.01)">
    <polygon points="50,0 100,50 50,100 0,50"/>
  </clipPath>
</svg>
<script>
function assert_element_at(element, pointlist) {
  for (let point of pointlist) {
    let result = document.elementFromPoint(point[0], point[1]);
    assert_equals(result, element, point.join(','));
  }
}

test(function() {
  let div = document.querySelector('.box');

  // Points inside clip-path.
  assert_element_at(div, [[150, 150], [150, 125], [150, 175], [125, 150], [175, 150]]);

  // Points outside clip-path.
  assert_element_at(document.body, [[120, 120], [180, 120], [120, 180], [180, 180]]);
});
</script>