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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/style-query-no-cycle.html 

<!DOCTYPE html>
<title>CSS Container Queries Test: </title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#style-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #container { --foo: bar; }
  @container style(--foo: var(--foo)) {
    #target { color: green; }
  }
</style>
<div id="container">
  <div id="target">Should be green</div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  test(() => {
    assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");
  }, "style(--foo: var(--foo)) should match");
</script>