css/css-view-transitions/hit-test-unpainted-element-from-point.html

<!DOCTYPE html>
<title>View transitions: hit test shared element at the real dom location</title>
<link rel="help" href="https://github.com/WICG/view-transitions">
<link rel="author" href="mailto:vmpstr@chromium.org">
<link rel="match" href="hit-test-unpainted-element-ref.html">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
html { view-transition-name: none }
#target {
  width: 100px;
  height: 100px;
  contain: paint;
  view-transition-name: shared;
  position: relative;
  z-index: 1;
}
.before {
  background: yellow;
  left: 200px;
}
.after {
  background: green;
}
.after:hover {
  background: red;
}
#unrelated {
  width: 50px;
  height: 50px;
  position: relative;
  top: -50px;
  background: blue;
}

html::view-transition {
  pointer-events: none;
}
html::view-transition-group(*) {
  pointer-events: auto;
}

html::view-transition-group(shared) {
  animation-delay: 300s;
}
html::view-transition-old(shared) {
  animation: unset;
  opacity: 1;
}
html::view-transition-new(shared) {
  display: none;
}
</style>

<div id=target class=before></div>
<div id=unrelated></div>

<script>
async_test(t => {
  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  document.startViewTransition(() => {
    target.classList.toggle("before");
    target.classList.toggle("after");
    requestAnimationFrame(async () => {
      // Check the old location of the element, we should get body.
      t.step(() => assert_equals(document.elementFromPoint(20, 20), document.body));
      // Check the new location of the pseudo element, we should get documentElement,
      // which is the originating element for the pseudo element.
      t.step(() => assert_equals(document.elementFromPoint(220, 20), document.documentElement));
      // Check the spot that used to be covered by the element but now has
      // unrelated element, which is what we expect to get.
      t.step(() => assert_equals(document.elementFromPoint(20, 70), unrelated));
      t.done();
    });
  });
}, "hit test should not hit unpainted element, but does hit pseudo and unrelated elements");
</script>