File: style-query-guaranteed-invalid.tentative.html

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<!DOCTYPE html>
<title>CSS Container Queries Test: style() query with guaranteed-invalid value</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#style-container">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11143">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #target { background-color: green; }
  @container --root style(--prop: var(--unknown)) {
    #target { background-color: red; }
  }
</style>
<div id="target"></div>
<script>
  setup(() => assert_implements_style_container_queries());

  test(() => {
    assert_equals(getComputedStyle(target).backgroundColor, "rgb(0, 128, 0)");
  }, "Querying with a guaranteed-invalid value should evaluate to false");

</script>