chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/at-container-style-serialization.html

<!doctype html>
<title>CSS Container Queries: style() conditionText serialization</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries">
<link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style id="testSheet">
  @container style(        --foo:bar) { }
  @container STyle(--foo:    ) { }
  @container STyle(--foo:) { }
  @container STyle(--foo) { }
  @container  style(  ( --FOO: BAR) OR ( prop: val  ) ) { }
  @container style (--foo: bar) { }
  @container style(--foo: bar   baz) { }
  @container style(--foo:2.100  ) { }
</style>
<script>
  setup(() => {
    assert_implements_container_queries();
    assert_equals(testSheet.sheet.cssRules.length, 8);
  });

  const tests = [
      ["style(--foo: bar)", "Normalize spaces"],
      ["style(--foo: )", "Empty declaration value - spaces"],
      ["style(--foo: )", "Empty declaration value"],
      ["style(--foo)", "No declaration value"],
      ["style((--FOO: BAR) or ( prop: val ))", "Unknown CSS property after 'or'"],
      ["style (--foo: bar)", "Not a style function with space before '('"],
      ["style(--foo: bar   baz)", "Spaces preserved in custom property value"],
      ["style(--foo: 2.100)", "Original string number in custom property value"]
  ].map((e, i) => [testSheet.sheet.cssRules[i], ...e]);

  tests.forEach((t) => {
    test(() => assert_equals(t[0].conditionText, t[1]), t[2]);
  });
</script>