mozilla-release/testing/web-platform/tests/content-security-policy/style-src/style-src-inline-style-nonce-blocked.html

<!doctype html>
<html>
<head>
    <meta http-equiv="Content-Security-Policy" content="style-src 'self' 'nonce-nonceynonce'">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>

    <script>
      var t = async_test("Should not load inline style element with invalid nonce");
      var t_spv = async_test("Should fire a securitypolicyviolation event");

      document.addEventListener("securitypolicyviolation", t_spv.step_func_done(function(e) {
        assert_equals("style-src-elem", e.violatedDirective);
      }));
    </script>
    <style nonce="not-nonceynonce">
        #content {
            margin-left: 2px;
        }
    </style>
</head>
<body>
    <div id='log'></div>

    <div id="content">Lorem ipsum</div>

    <script>
      t.step(function() {
        var contentEl = document.getElementById("content");
        var marginLeftVal = getComputedStyle(contentEl).getPropertyValue('margin-left');
        assert_false(marginLeftVal == "2px");
        t.done();
      });
    </script>

</body>
</html>