if-invalidation.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-invalidation.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSS Values and Units Test: if() invalidation</title>

<meta name="assert" content="Test if() invalidation">

<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>

  html {

    --x: 3;

  #test {

    --prop: if(style(--x: 3): true_value; else: false_value;);

</style>

<html>

  <body>

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

  </body>

</html>

<script>

  setup({ single_test: true });

  let elem = document.getElementById('test');

  let old_value = window.getComputedStyle(elem).getPropertyValue('--prop');

  assert_equals(old_value, "true_value");

  document.documentElement.style.setProperty('--x', '0');

  let new_value = window.getComputedStyle(elem).getPropertyValue('--prop');

  assert_equals( new_value, "false_value");

  assert_not_equals(new_value, old_value);

  done();

</script>