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chromium/third_party/blink/web_tests/http/tests/security/base-url-javascript-valid.html 

<!DOCTYPE html>
<head>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <base href="javascript: // This is a valid JavaScript URL">
</head>
<body>
  <script>
    async_test(t => {
      const base = document.querySelector('base');
      const img = new Image();
      img.onload = t.step_func_done(_ => {
        assert_equals(img.naturalWidth, 76, "Image loaded correctly.");
        assert_equals(img.src, "http://127.0.0.1:8000/security/resources/abe.png");
        assert_equals(base.href, 'javascript: // This is a valid JavaScript URL');
      });
      img.onerror = t.unreached_func("Image should have loaded.");

      img.src = "/security/resources/abe.png";
    }, "A base URL is a valid 'javascript:' URL.");
  </script>
</body>