style-container-invalidation-inheritance.html

<!DOCTYPE html>
<title>CSS Container Query Test: named style container query change with inherited custom property</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #container {
    container-name: container;
  }
  .match {
    --match: true;
  }
  #inner {
    color: red;
  }
  @container container style(--match: true) {
    #inner {
      color: green;
    }
  }
</style>
<div id="container">
  <div id="outer">
    <div id="inner"></div>
  </div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  test(() => {
    assert_equals(getComputedStyle(inner).color, "rgb(255, 0, 0)");
    assert_equals(getComputedStyle(inner).getPropertyValue("--match"), "");
    assert_equals(getComputedStyle(outer).getPropertyValue("--match"), "");
    assert_equals(getComputedStyle(container).getPropertyValue("--match"), "");
  }, "Pre-conditions");

  test(() => {
    container.className = "match";
    assert_equals(getComputedStyle(inner).color, "rgb(0, 128, 0)");
    assert_equals(getComputedStyle(inner).getPropertyValue("--match"), "true");
    assert_equals(getComputedStyle(outer).getPropertyValue("--match"), "true");
    assert_equals(getComputedStyle(container).getPropertyValue("--match"), "true");
  }, "Changed --match inherits down descendants and affects container query");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/style-container-invalidation-inheritance.html