File: transform-scale-hittest.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-scale">
<link rel="help" href="http://www.w3.org/TR/cssom-view/#extensions-to-the-document-interface">
<link rel="help" href="https://crbug.com/1015801">
<link rel="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#normal {
  width: 100px;
  height: 10px;
  position: absolute;
  top: 0px;
}

#scaled {
  width: 1px;
  height: 1px;
  transform: scaleX(100) scaleY(100);
  transform-origin: 0px 0px;
  position: absolute;
  top: 10px;
  z-index: 1; /* Hit test #scaled before #normal */
}
</style>
<div id=normal></div>
<div id=scaled></div>
<script>
test(() => {
  const result = document.elementFromPoint(50, 9);
  assert_equals(result, document.getElementById('normal'));
}, 'Hit test within unscaled box');

test(() => {
  const result = document.elementFromPoint(50, 9.1);
  assert_equals(result, document.getElementById('scaled'));
}, 'Hit test intersecting scaled box');
</script>