async-clipboard-stale-getType-reject.tentative.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/async-clipboard-stale-getType-reject.tentative.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>

  Async Clipboard: getType() on stale ClipboardItem after clipboard.write()

</title>

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

<body>Body needed for test_driver.click()</body>

<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>

<script>

// Tests that getType() on a ClipboardItem obtained from clipboard.read()

// rejects after clipboard.write() changes the clipboard content.

// This verifies the browser detects stale clipboard data and prevents

// reading data that no longer matches what was originally enumerated.

promise_test(async t => {

  await tryGrantReadPermission();

  await tryGrantWritePermission();

  // Step 1: Write initial data to the clipboard.

  const initialBlob = new Blob(['initial text'], {type: 'text/plain'});

  const initialItem = new ClipboardItem({'text/plain': initialBlob});

  await waitForUserActivation();

  await navigator.clipboard.write([initialItem]);

  // Step 2: Read the clipboard to obtain a ClipboardItem.

  await waitForUserActivation();

  const clipboardItems = await navigator.clipboard.read();

  assert_equals(clipboardItems.length, 1);

  const staleItem = clipboardItems[0];

  assert_true(staleItem instanceof ClipboardItem);

  assert_true(staleItem.types.includes('text/plain'));

  // Step 3: Write new data to the clipboard, invalidating the old item.

  const newBlob = new Blob(['overwritten text'], {type: 'text/plain'});

  const newItem = new ClipboardItem({'text/plain': newBlob});

  await waitForUserActivation();

  await navigator.clipboard.write([newItem]);

  // Step 4: getType() on the stale item should reject with DataError.

  await promise_rejects_dom(t, 'DataError', staleItem.getType('text/plain'));

}, 'getType() rejects with DataError on stale ClipboardItem after clipboard.write()');

</script>