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diff --git a/testing/web-platform/tests/streams/transferable/readable-stream.html b/testing/web-platform/tests/streams/transferable/readable-stream.html
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+++ b/testing/web-platform/tests/streams/transferable/readable-stream.html
@@ -0,0 +1,260 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/helpers.js"></script>
+<script src="../resources/recording-streams.js"></script>
+<script src="../resources/test-utils.js"></script>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const rs = await createTransferredReadableStream({
+    start(controller) {
+      controller.enqueue('a');
+      controller.close();
+    }
+  });
+  const reader = rs.getReader();
+  {
+    const {value, done} = await reader.read();
+    assert_false(done, 'should not be done yet');
+    assert_equals(value, 'a', 'first chunk should be a');
+  }
+  {
+    const {done} = await reader.read();
+    assert_true(done, 'should be done now');
+  }
+}, 'sending one chunk through a transferred stream should work');
+
+promise_test(async () => {
+  let controller;
+  const rs = await createTransferredReadableStream({
+    start(c) {
+      controller = c;
+    }
+  });
+  for (let i = 0; i < 10; ++i) {
+    controller.enqueue(i);
+  }
+  controller.close();
+  const reader = rs.getReader();
+  for (let i = 0; i < 10; ++i) {
+    const {value, done} = await reader.read();
+    assert_false(done, 'should not be done yet');
+    assert_equals(value, i, 'chunk content should match index');
+  }
+  const {done} = await reader.read();
+  assert_true(done, 'should be done now');
+}, 'sending ten chunks through a transferred stream should work');
+
+promise_test(async () => {
+  let controller;
+  const rs = await createTransferredReadableStream({
+    start(c) {
+      controller = c;
+    }
+  });
+  const reader = rs.getReader();
+  for (let i = 0; i < 10; ++i) {
+    controller.enqueue(i);
+    const {value, done} = await reader.read();
+    assert_false(done, 'should not be done yet');
+    assert_equals(value, i, 'chunk content should match index');
+  }
+  controller.close();
+  const {done} = await reader.read();
+  assert_true(done, 'should be done now');
+}, 'sending ten chunks one at a time should work');
+
+promise_test(async () => {
+  let controller;
+  const rs = await createTransferredReadableStream({
+    start() {
+      this.counter = 0;
+    },
+    pull(controller) {
+      controller.enqueue(this.counter);
+      ++this.counter;
+      if (this.counter === 10)
+        controller.close();
+    }
+  });
+  const reader = rs.getReader();
+  for (let i = 0; i < 10; ++i) {
+    const {value, done} = await reader.read();
+    assert_false(done, 'should not be done yet');
+    assert_equals(value, i, 'chunk content should match index');
+  }
+  const {done} = await reader.read();
+  assert_true(done, 'should be done now');
+}, 'sending ten chunks on demand should work');
+
+promise_test(async () => {
+  const rs = recordingReadableStream({}, { highWaterMark: 0 });
+  await delay(0);
+  assert_array_equals(rs.events, [], 'pull() should not have been called');
+  // Eat the message so it can't interfere with other tests.
+  addEventListener('message', () => {}, {once: true});
+  // The transfer is done manually to verify that it is posting the stream that
+  // relieves backpressure, not receiving it.
+  postMessage(rs, '*', [rs]);
+  await delay(0);
+  assert_array_equals(rs.events, ['pull'], 'pull() should have been called');
+}, 'transferring a stream should relieve backpressure');
+
+promise_test(async () => {
+  const rs = await recordingTransferredReadableStream({
+    pull(controller) {
+      controller.enqueue('a');
+    }
+  }, { highWaterMark: 2 });
+  await delay(0);
+  assert_array_equals(rs.events, ['pull', 'pull', 'pull'],
+                      'pull() should have been called three times');
+}, 'transferring a stream should add one chunk to the queue size');
+
+promise_test(async () => {
+  const rs = await recordingTransferredReadableStream({
+    start(controller) {
+      controller.enqueue(new Uint8Array(1024));
+      controller.enqueue(new Uint8Array(1024));
+    }
+  }, new ByteLengthQueuingStrategy({highWaterMark: 512}));
+  await delay(0);
+  // At this point the queue contains 1024/512 bytes and 1/1 chunk, so it's full
+  // and pull() is not called.
+  assert_array_equals(rs.events, [], 'pull() should not have been called');
+  const reader = rs.getReader();
+  const {value, done} = await reader.read();
+  assert_false(done, 'we should not be done');
+  assert_equals(value.byteLength, 1024, 'expected chunk should be returned');
+  // Now the queue contains 0/512 bytes and 1/1 chunk, so pull() is called. If
+  // the implementation erroneously counted the extra queue space in bytes, then
+  // the queue would contain 1024/513 bytes and pull() wouldn't be called.
+  assert_array_equals(rs.events, ['pull'], 'pull() should have been called');
+}, 'the extra queue from transferring is counted in chunks');
+
+async function transferredReadableStreamWithCancelPromise() {
+  let resolveCancelCalled;
+  const cancelCalled = new Promise(resolve => {
+    resolveCancelCalled = resolve;
+  });
+  const rs = await recordingTransferredReadableStream({
+    cancel() {
+      resolveCancelCalled();
+    }
+  });
+  return { rs, cancelCalled };
+}
+
+promise_test(async () => {
+  const { rs, cancelCalled } = await transferredReadableStreamWithCancelPromise();
+  rs.cancel('message');
+  await cancelCalled;
+  assert_array_equals(rs.events, ['pull', 'cancel', 'message'],
+                      'cancel() should have been called');
+  const reader = rs.getReader();
+  // Check the stream really got closed.
+  await reader.closed;
+}, 'cancel should be propagated to the original');
+
+promise_test(async () => {
+  const { rs, cancelCalled } = await transferredReadableStreamWithCancelPromise();
+  const reader = rs.getReader();
+  const readPromise = reader.read();
+  reader.cancel('done');
+  const { done } = await readPromise;
+  assert_true(done, 'should be done');
+  await cancelCalled;
+  assert_array_equals(rs.events, ['pull', 'cancel', 'done'],
+                      'events should match');
+}, 'cancel should abort a pending read()');
+
+promise_test(async () => {
+  let cancelComplete = false;
+  const rs = await createTransferredReadableStream({
+    async cancel() {
+      await flushAsyncEvents();
+      cancelComplete = true;
+    }
+  });
+  await rs.cancel();
+  assert_false(cancelComplete,
+               'cancel() on the underlying sink should not have completed');
+}, 'stream cancel should not wait for underlying source cancel');
+
+promise_test(async t => {
+  const rs = await recordingTransferredReadableStream();
+  const reader = rs.getReader();
+  let serializationHappened = false;
+  rs.controller.enqueue({
+    get getter() {
+      serializationHappened = true;
+      return 'a';
+    }
+  });
+  await flushAsyncEvents();
+  assert_false(serializationHappened,
+               'serialization should not have happened yet');
+  const {value, done} = await reader.read();
+  assert_false(done, 'should not be done');
+  assert_equals(value.getter, 'a', 'getter should be a');
+  assert_true(serializationHappened,
+              'serialization should have happened');
+}, 'serialization should not happen until the value is read');
+
+promise_test(async t => {
+  const rs = await recordingTransferredReadableStream();
+  const reader = rs.getReader();
+  rs.controller.enqueue(new ReadableStream());
+  await promise_rejects_dom(t, 'DataCloneError', reader.read(),
+                            'closed promise should reject');
+  assert_throws_js(TypeError, () => rs.controller.enqueue(),
+                   'original stream should be errored');
+}, 'transferring a non-serializable chunk should error both sides');
+
+promise_test(async t => {
+  const rs = await createTransferredReadableStream({
+    start(controller) {
+      controller.error('foo');
+    }
+  });
+  const reader = rs.getReader();
+  return promise_rejects_exactly(t, 'foo', reader.read(),
+                                 'error should be passed through');
+}, 'errors should be passed through');
+
+promise_test(async () => {
+  const rs = await recordingTransferredReadableStream();
+  await delay(0);
+  const reader = rs.getReader();
+  reader.cancel();
+  rs.controller.error();
+  const {done} = await reader.read();
+  assert_true(done, 'should be done');
+  assert_throws_js(TypeError, () => rs.controller.enqueue(),
+                   'enqueue should throw');
+}, 'race between cancel() and error() should leave sides in different states');
+
+promise_test(async () => {
+  const rs = await recordingTransferredReadableStream();
+  await delay(0);
+  const reader = rs.getReader();
+  reader.cancel();
+  rs.controller.close();
+  const {done} = await reader.read();
+  assert_true(done, 'should be done');
+}, 'race between cancel() and close() should be benign');
+
+promise_test(async () => {
+  const rs = await recordingTransferredReadableStream();
+  await delay(0);
+  const reader = rs.getReader();
+  reader.cancel();
+  rs.controller.enqueue('a');
+  const {done} = await reader.read();
+  assert_true(done, 'should be done');
+}, 'race between cancel() and enqueue() should be benign');
+
+</script>