writeText-readText-on-detached-iframe.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:
- /clipboard-apis/detached-iframe/writeText-readText-on-detached-iframe.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>navigator.clipboard readText and writeText on detached iframe</title>

<link rel='help' href='https://w3c.github.io/clipboard-apis/#async-clipboard-api'>

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

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

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

<script src="/resources/testdriver-vendor.js"></script>

<script src="../resources/user-activation.js"></script>

<iframe id="iframe"></iframe>

<script>

'use strict';

promise_test(async t => {

  await tryGrantReadPermission();

  await tryGrantWritePermission();

  const iframe = document.getElementById('iframe');

  await waitForUserActivation();

  // Clipboard API must only be available in focused documents.

  // reference: https://www.w3.org/TR/clipboard-apis/#privacy-async

  iframe.focus();

  const iframeClipboard = iframe.contentWindow.navigator.clipboard;

  // Writing and reading should succeed on same-origin iframes.

  const attachedWriteText = 'attached write text'

  await iframeClipboard.writeText(attachedWriteText);

  const attachedWriteResult = await iframeClipboard.readText();

  assert_equals(attachedWriteResult, attachedWriteText,

      'attached iframes should be able to readText and writeText normally');

  iframe.parentNode.removeChild(iframe);

  // Writing onto a detached iframe's clipboard should fail, but not crash.

  const detachedWriteText = 'detached write text';

  await iframeClipboard.writeText(detachedWriteText);

  const readResultDetached = await iframeClipboard.readText();

  assert_equals(readResultDetached, undefined,

      'reading from detached iframes should output undefined');

}, 'Verify readText and writeText fails on detached iframe');

</script>