base-uri-allow-leading-zero-port.sub.html

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Security-Policy" content="base-uri {{location[scheme]}}://{{domains[www1]}}:0{{ports[http][0]}}/">
    <script src='/resources/testharness.js'></script>
    <script src='/resources/testharnessreport.js'></script>

    <script>
      var t = async_test("Check that base URIs can be set if they do not violate the page's policy because leading 0s are stripped from the port.");
      window.addEventListener('securitypolicyviolation', t.step_func(function(t) {
        assert_unreached('No CSP violation report should have been fired.');
      }));
    </script>

    <base href="{{location[scheme]}}://{{domains[www1]}}:{{ports[http][0]}}/">
    <script>
    t.step(function() {
      assert_equals(document.baseURI, "{{location[scheme]}}://{{domains[www1]}}:{{ports[http][0]}}/");
      t.done();
    });
    </script>
</head>
<body>
</html>

chromium/third_party/blink/web_tests/external/wpt/content-security-policy/base-uri/base-uri-allow-leading-zero-port.sub.html