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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/idlharness.html 

<!doctype html>
<title>CSS Container Queries: CSSContainer Rule IDL tests</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/WebIDLParser.js"></script>
<script src="/resources/idlharness.js"></script>
<!-- used to provide objects -->
<style>
  @container cont (width = 100px) {
    @container (inline-size > 200em) {
      #id { color: lime }
    }
    #id { color: green }
  }
</style>
<script>
  idl_test(
      ['css-conditional-5'],
      ['css-conditional', 'cssom', 'dom'],
      idl_array => {
        idl_array.add_objects({
          CSSContainerRule: ['sheet.cssRules[0]',
                             'sheet.cssRules[0].cssRules[0]'],
        });
        self.sheet = document.styleSheets[0];
      }
    );
</script>