permissions-policy-util.sub.js

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const TOPICS_PERMISSIONS_POLICY_ERROR_MESSAGE = 'The \"browsing-topics\" Permissions Policy denied the use of document.browsingTopics().';

function test_topics_feature_availability_in_subframe(test, is_same_origin, expect_feature_available_func) {

  const same_origin_src = '/browsing-topics/resources/document-api-notify-parent.tentative.https.html';

  const cross_origin_src = 'https://{{domains[www]}}:{{ports[https][0]}}' +

    same_origin_src;

  let frame = document.createElement('iframe');

  frame.src = is_same_origin ? same_origin_src : cross_origin_src;

  window.addEventListener('message', test.step_func(function handler(evt) {

    if (evt.source === frame.contentWindow) {

      expect_feature_available_func(evt.data);

      document.body.removeChild(frame);

      window.removeEventListener('message', handler);

      test.done();

  }));

  document.body.appendChild(frame);

function expect_topics_feature_unavailable(data) {

  assert_equals(data.error, TOPICS_PERMISSIONS_POLICY_ERROR_MESSAGE);

function expect_topics_feature_available(data) {

  assert_equals(data.error, 'No error');