inline-speculation-rules-base-url-errors.tentative.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:
- /speculation-rules/inline-speculation-rules-base-url-errors.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel="help" href="https://html.spec.whatwg.org/multipage/urls-and-fetching.html#respond-to-base-url-changes">

<link rel="help" href="https://html.spec.whatwg.org/multipage/webappapis.html#update-speculation-rules">

<link rel="help" href="https://html.spec.whatwg.org/multipage/semantics.html#the-base-element">

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

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

<script>

// Invalid inline speculation rules report a TypeError exception on window,

// which testharness.js's global error listener would otherwise treat as an

// unexpected harness error.

setup({ allow_uncaught_exception: true });

promise_test(async t => {

  const script = document.createElement('script');

  script.type = 'speculationrules';

  script.textContent = 'invalid json';

  t.add_cleanup(() => script.remove());

  let elementErrorCount = 0;

  let globalErrorCount = 0;

  const elementError = new Promise(resolve => {

    script.addEventListener('error', () => {

      elementErrorCount++;

      resolve();

});

});

  const onWindowError = e => {

    e.preventDefault();

    globalErrorCount++;

};

  window.addEventListener('error', onWindowError);

  t.add_cleanup(() => window.removeEventListener('error', onWindowError));

  document.head.appendChild(script);

  await elementError;

  assert_equals(elementErrorCount, 1, 'initial element error event count');

  assert_equals(globalErrorCount, 1, 'initial window error event count');

  // Modifying a disconnected <base> element should not trigger base URL updates.

  const disconnectedBase = document.createElement('base');

  disconnectedBase.href = 'https://example.com/disconnected/';

  disconnectedBase.cloneNode(true);

  assert_equals(elementErrorCount, 1, 'element error count after disconnected base');

  assert_equals(globalErrorCount, 1, 'window error count after disconnected base');

  // Inserting, updating, and removing a connected <base> element should not

  // re-fire error events for an already-errored speculationrules script.

  const base = document.createElement('base');

  base.href = 'https://example.com/sub1/';

  t.add_cleanup(() => base.remove());

  document.head.appendChild(base);

  base.href = 'https://example.com/sub2/';

  base.remove();

  await new Promise(resolve => t.step_timeout(resolve, 0));

  assert_equals(elementErrorCount, 1, 'element error count after base URL changes');

  assert_equals(globalErrorCount, 1, 'window error count after base URL changes');

}, 'Base URL changes do not re-fire error events on invalid speculation rules');

</script>