fledge-container-size-mutation-observer.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /fenced-frame/fledge-container-size-mutation-observer.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Test that mutation observer doesn't break noassert container size setter.</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/utils.js"></script>

<script src="/common/dispatcher/dispatcher.js"></script>

<script src="resources/utils.js"></script>

<body>

<script>

async function checkMutationObserver() {

  // Create a FLEDGE FF with a constant content size and given container size.

  const requested_width_1 = '299px';

  const requested_height_1 = '72px';

  const frame = await attachFencedFrameContext({

      generator_api: 'fledge', resolve_to_config: true, ad_with_size: true,

      requested_size: [requested_width_1, requested_height_1]});

  // Install a mutation observer.

  const config = { attributes: true, childList: true, subtree: true };

  const callback = (mutationList, observer) => {

    throw new Error("mutation observed");

  const observer = new MutationObserver(callback);

  observer.observe(frame.element, config);

  // Modify the container size manually.

  const modified_width = '121px';

  const modified_height = '444px';

  frame.element.width = modified_width;

  frame.element.height = modified_height;

  // Navigate to a new FLEDGE FF config with a different container size.

  const requested_width_2 = '321px';

  const requested_height_2 = '49px';

  const replaced_frame = await replaceFrameContext(frame, {

      generator_api: 'fledge', resolve_to_config: true, ad_with_size: true,

      requested_size: [requested_width_2, requested_height_2]});

  observer.disconnect();

setup({allow_uncaught_exception: true});

promise_test(async () => { return checkMutationObserver(); }, 'Container size assert no exception ignores mutation observer');

</script>

</body>