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chromium/third_party/blink/web_tests/external/wpt/css/css-font-loading/fontfaceset-load-var.html 

<!DOCTYPE html>
<title>SyntaxError thrown when matching loading values with var()</title>
<link rel="help" href="https://drafts.csswg.org/css-font-loading/#font-face-set-load">
<link rel="help" href="https://drafts.csswg.org/css-font-loading/#find-the-matching-font-faces">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

  function load_on_worker(keyword) {
    return new Promise((resolve, reject) =>{
      var blob = new Blob([`
        self.fonts.load('${keyword}').then(
          ()=>{ self.postMessage('success') },
          (e)=>{ self.postMessage(e) }
        );
      `]);
      var blob_url = window.URL.createObjectURL(blob);
      let worker = new Worker(blob_url);
      worker.onmessage = msg => {
        if (msg === 'success')
          resolve(msg.data)
        else
          reject(msg.data)
      }
    });
  }

  promise_test(test => {
    return promise_rejects_dom(test, 'SyntaxError', document.fonts.load('var(--x) serif'));
  }, 'Loading "var(--x) serif" causes SyntaxError (document)')

  promise_test(test => {
    return promise_rejects_dom(test, 'SyntaxError', document.fonts.load('var(--x, 10px) serif'));
  }, 'Loading "var(--x, 10px) serif" causes SyntaxError (document)')

  promise_test(test => {
    return promise_rejects_dom(test, 'SyntaxError', load_on_worker('var(--x) serif'));
  }, 'Loading "var(--x) serif" causes SyntaxError (worker)')

  promise_test(test => {
    return promise_rejects_dom(test, 'SyntaxError', load_on_worker('var(--x, 10px) serif'));
  }, 'Loading "var(--x, 10px) serif" causes SyntaxError (worker)')

</script>