navigation-support.html

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<p>Support page for trusted-types-navigation.*.html tests.</p>

<a id="anchor" href="#">link</a>

<script>

  if (location.search == "?defaultpolicy") {

    trustedTypes.createPolicy("default", {

        createScript: s => s.replace("continue", "defaultpolicywashere"),

});

  function bounceEventToOpener(e) {

    const msg = {};

    for (const field of ["effectiveDirective", "sample", "type"]) {

      msg[field] = e[field];

    msg["uri"] = location.href;

    window.opener.postMessage(msg, "*");

  // If a navigation is blocked by Trusted Types, we expect this window to

  // throw a SecurityPolicyViolationEvent. If it's not blocked, we expect the

  // loaded frame to through DOMContentLoaded. In either case there should be

  // _some_ event that we can expect.

  document.addEventListener("DOMContentLoaded", bounceEventToOpener);

  document.addEventListener("securitypolicyviolation", bounceEventToOpener);

  // We'll use a javascript:-url to navigate to ourselves, so that we can

  // re-use the messageing mechanisms above. In order to not end up in a loop,

  // we'll only click if we don't find fragment in the current URL.

  const target_script = `location.href='${location.href}&continue';`;

  const target = `javascript:"<script>${target_script}</scri${""}pt>"`;

  const anchor = document.getElementById("anchor");

  anchor.href = target;

  if (!location.hash)

    document.addEventListener("DOMContentLoaded", _ => anchor.click());

</script>

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