if-supports-quirks.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-values/if-supports-quirks.html - WPT Dashboard Interop Dashboard

<!-- quirks mode -->

<title>CSS Values and Units Test: CSS inline if() function supports() in quirks mode</title>

<meta name="assert" content="Test inline if() function with supports() query in quirks mode">

<link rel="help" href="https://drafts.csswg.org/css-values-5/#if-notation">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

    div {

      color: red;

      --x: if(supports(width: 30): true_value; else: false_value;)

</style>

<div id="if">test</div>

<script>

  setup({ single_test: true });

  var elem = document.getElementById("if");

  let val = window.getComputedStyle(elem).getPropertyValue("--x");

  assert_equals(val, "true_value");

  done();

</script>