File: container-size-invalidation.html

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<!doctype html>
<title>@container-dependent elements respond to container size changes</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#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: 50px;
  }
  div { color: red; }
  @container (min-width: 300px) {
    div { color: green; }
  }
</style>
<main id=container>
  <div id=child>
    Test
    <p><span id=descendant>Deep</span></p>
  </div>
</main>
<script>
  setup(() => assert_implements_container_queries());

  test(function() {
    assert_equals(getComputedStyle(child).color, 'rgb(255, 0, 0)');
    container.style.width = '300px';
    assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
  }, 'Children respond to changes in container size');

  test(function() {
    container.style = '';
    assert_equals(getComputedStyle(descendant).color, 'rgb(255, 0, 0)');
    container.style.width = '300px';
    assert_equals(getComputedStyle(descendant).color, 'rgb(0, 128, 0)');
  }, 'Descendants respond to changes in container size');
</script>