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diff --git a/testing/web-platform/tests/clipboard-apis/async-custom-formats-write-read.tentative.https.html b/testing/web-platform/tests/clipboard-apis/async-custom-formats-write-read.tentative.https.html
new file mode 100644
index 0000000000..a005f8c98f
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+++ b/testing/web-platform/tests/clipboard-apis/async-custom-formats-write-read.tentative.https.html
@@ -0,0 +1,47 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Async Clipboard custom write -> Async Clipboard custom read test</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>
+'use strict';
+
+promise_test(async t => {
+  await test_driver.set_permission({name: 'clipboard-read'}, 'granted');
+  await test_driver.set_permission({name: 'clipboard-write'}, 'granted');
+  const format1 = 'web application/x-custom-format-clipboard-test-format-1';
+  const format2 = 'web application/x-custom-format-clipboard-test-format-2';
+  const blobInput1 = new Blob(['input data 1'], {type: format1});
+  const blobInput2 = new Blob(['input data 2'], {type: format2});
+  const clipboardItemInput = new ClipboardItem(
+      {[format1]: blobInput1, [format2]: blobInput2});
+  await waitForUserActivation();
+  await navigator.clipboard.write([clipboardItemInput]);
+
+  // Items should be readable on a custom format clipboard after custom format
+  // write.
+  await waitForUserActivation();
+  const clipboardItems = await navigator.clipboard.read();
+  assert_equals(clipboardItems.length, 1);
+  const clipboardItem = clipboardItems[0];
+  assert_true(clipboardItem instanceof ClipboardItem);
+  // This test can't verify clipboardItem.types, because its size and values
+  // are both platform-dependent.
+
+  const blobOutput1 = await clipboardItem.getType(format1);
+  assert_equals(blobOutput1.type, format1);
+  const data1 = await (new Response(blobOutput1)).text();
+  assert_equals(data1, 'input data 1');
+
+  const blobOutput2 = await clipboardItem.getType(format2);
+  assert_equals(blobOutput2.type, format2);
+  const data2 = await (new Response(blobOutput2)).text();
+  assert_equals(data2, 'input data 2');
+}, 'Verify write and read clipboard given 2 platform-neutral custom format inputs');
+
+</script>