css/css-properties-values-api/registered-property-ident-function.html

<!DOCTYPE html>
<title>CSS Properties Values API: Registered custom properties with ident()</title>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#ident">
<link rel="help" href="https://drafts.csswg.org/css-properties-values-api-1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  @property --ident {
    syntax: "<custom-ident>";
    inherits: true;
    initial-value: none;
  }
</style>
<div id=target></div>
<script>
  let actual_ident = 'ident("--myident" calc(42 * sign(1em - 1px)))';
  let expected_ident = '--myident42';

  test((t) => {
    t.add_cleanup(() => { target.style = ''; })
    target.style.setProperty('--ident', actual_ident);
    assert_equals(getComputedStyle(target).getPropertyValue('--ident'),
      expected_ident);
  }, 'The ident() function is resolved in a registered custom property');
</script>