trusted-types/script-enforcement-011.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/namespaces.js"></script>
<script src="support/passthroughpolicy.js"></script>
<script src="support/script-messages.js"></script>
<link rel="help" href="https://w3c.github.io/trusted-types/dist/spec/#enforcement-in-scripts">
<link rel="help" href="https://html.spec.whatwg.org/#prepare-the-script-element">
<meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script'">
<div id="container"></div>
<script>
  let script;
  const checkScriptType = "try { undefined = 0; window.log_message('CLASSIC'); } catch(e) { window.log_message('MODULE'); }";

  // Define a default policy that change the script's type.
  trustedTypes.createPolicy("default", {
    createScript: (value, _, sink) => {
      window.log_message("CREATE_SCRIPT");
      window.log_message(sink);
      if (script.hasAttribute("type")) {
        script.removeAttribute("type");
      } else {
        script.setAttribute("type",  "module");
      }
      return value;
    }
  });

  promise_test(async t => {
    let messages = await script_messages_for(async _ => {
      t.add_cleanup(_ => { script = null });
      script = create_svg_script_with_untrusted_source_text(checkScriptType);
      script.setAttribute("type", "module");
      container.appendChild(script);
    });
    assert_array_equals(messages, ["CREATE_SCRIPT", "SVGScriptElement text", "CLASSIC"]);
  }, "Changing script's type from classic to module in the default policy works.");

  promise_test(async t => {
    let messages = await script_messages_for(async _ => {
      t.add_cleanup(_ => { script = null });
      script = create_svg_script_with_untrusted_source_text(checkScriptType);
      container.appendChild(script);
    });
    assert_array_equals(messages, ["CREATE_SCRIPT", "SVGScriptElement text", "MODULE"]);
  }, "Changing script's type from module to classic in the default policy works.");
</script>