File: test_ua_widget_elementFromPoint.html

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<!doctype html>
<title>UA Widget getElementFromPoint</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css" />
<div id="host" style="width: 100px; height: 100px"></div>
<script>
  const host = document.getElementById("host");
  SpecialPowers.wrap(host.attachShadow({ mode: "open" })).setIsUAWidget();
  host.shadowRoot.innerHTML = `
  <div style="width: 100px; height: 100px; background-color: green;"></div>
`;
  let hostRect = host.getBoundingClientRect();
  let point = {
    x: hostRect.x + 50,
    y: hostRect.y + 50,
  };
  is(
    document.elementFromPoint(point.x, point.y),
    host,
    "Host should be found from the document"
  );
  is(
    host.shadowRoot.elementFromPoint(point.x, point.y),
    host.shadowRoot.firstElementChild,
    "Should not have retargeted UA widget content to host unnecessarily"
  );
</script>