File: container-size-invalidation-after-load.html

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<!DOCTYPE html>
<title>@container: invalidation of container size after load event</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#size-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #container {
    container-type: size;
    width: 200px;
    height: 4em;
    border: 1px solid black;
  }
  @container (width > 300px) {
    #child { color: green; }
  }
</style>
<div id=container>
  <div id=child>
    Green
  </div>
</div>
<script>
  setup(() => assert_implements_size_container_queries());

  function waitForLoad(w) {
    return new Promise(resolve => w.addEventListener('load', resolve));
  }

  promise_test(async () => {
    await waitForLoad(window);
    container.offsetTop;

    container.style.width = '400px';
    container.style.setProperty('--x', 'x'); // crbug.com/1321010

    assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
  });
</script>