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diff --git a/testing/web-platform/tests/close-watcher/user-activation.html b/testing/web-platform/tests/close-watcher/user-activation.html
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+<!doctype html>
+<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/testdriver-actions.js"></script>
+<script src="resources/helpers.js"></script>
+
+<div id="d" style="height: 100px; width: 100px;"></div>
+<script>
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+
+  await test_driver.bless("call close()", () => freeWatcher.close());
+
+  assert_array_equals(events, ["freeWatcher cancel", "freeWatcher close"]);
+}, "CloseWatchers created without user activation, but close()d via user activation, fires cancel");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+  freeWatcher.addEventListener("cancel", e => e.preventDefault());
+
+  await test_driver.bless("call close()", () => freeWatcher.close());
+
+  assert_array_equals(events, ["freeWatcher cancel"]);
+}, "CloseWatchers created without user activation, but close()d via user activation, fires cancel, which can be preventDefault()ed");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+
+  await test_driver.bless("grant user activation", () => sendCloseSignal());
+
+  assert_array_equals(events, ["freeWatcher cancel", "freeWatcher close"]);
+}, "CloseWatchers created without user activation, but closed via a close signal after user activation, fires cancel");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+  freeWatcher.addEventListener("cancel", e => e.preventDefault());
+
+  await test_driver.bless("grant user activation", () => sendCloseSignal());
+
+  assert_array_equals(events, ["freeWatcher cancel"]);
+}, "CloseWatchers created without user activation, but closed via a close signal after user activation, fires cancel, which can be preventDefault()ed");
+
+promise_test(async t => {
+  const events = [];
+  createRecordingCloseWatcher(t, events, "freeWatcher");
+  createRecordingCloseWatcher(t, events, "watcher1");
+  createRecordingCloseWatcher(t, events, "watcher2");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["watcher2 close", "watcher1 close", "freeWatcher close"]);
+}, "Multiple CloseWatchers created without user activation close together (with no cancel)");
+
+promise_test(async t => {
+  const events = [];
+  createRecordingCloseWatcher(t, events, "freeWatcher");
+  await createBlessedRecordingCloseWatcher(t, events, "activationWatcher");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["activationWatcher close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["activationWatcher close", "freeWatcher close"]);
+}, "Creating a CloseWatcher from user activation keeps it separate from the free CloseWatcher, but they don't fire cancel");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+  const activationWatcher = await createBlessedRecordingCloseWatcher(t, events, "activationWatcher");
+
+  await test_driver.bless("call activationWatcher.close()", () => activationWatcher.close());
+  assert_array_equals(events, ["activationWatcher cancel", "activationWatcher close"]);
+
+  await test_driver.bless("call freeWatcher.close()", () => freeWatcher.close());
+  assert_array_equals(events, ["activationWatcher cancel", "activationWatcher close", "freeWatcher cancel", "freeWatcher close"]);
+}, "Creating a CloseWatcher from user activation, and close()ing CloseWatchers with user activation, fires cancel");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+  const activationWatcher = await createBlessedRecordingCloseWatcher(t, events, "activationWatcher");
+
+  await test_driver.bless("grant user activation", () => sendCloseSignal());
+  assert_array_equals(events, ["activationWatcher cancel", "activationWatcher close"]);
+
+  await test_driver.bless("grant user activation", () => sendCloseSignal());
+  assert_array_equals(events, ["activationWatcher cancel", "activationWatcher close", "freeWatcher cancel", "freeWatcher close"]);
+}, "Creating a CloseWatcher from user activation, and closing CloseWatchers with a close signal after user activation, fires cancel");
+
+promise_test(async t => {
+  const events = [];
+  createRecordingCloseWatcher(t, events, "freeWatcher");
+  await createBlessedRecordingCloseWatcher(t, events, "activationWatcher1");
+  await createBlessedRecordingCloseWatcher(t, events, "activationWatcher2");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["activationWatcher2 close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["activationWatcher2 close", "activationWatcher1 close"]);
+}, "Multiple CloseWatchers created with user activation close in reverse order");
+
+promise_test(async t => {
+  const events = [];
+  createRecordingCloseWatcher(t, events, "freeWatcher");
+  await createBlessedRecordingCloseWatcher(t, events, "activationWatcher1");
+  await createBlessedRecordingCloseWatcher(t, events, "activationWatcher2");
+  await createBlessedRecordingCloseWatcher(t, events, "activationWatcher3");
+  createRecordingCloseWatcher(t, events, "watcher4");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["watcher4 close", "activationWatcher3 close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["watcher4 close", "activationWatcher3 close", "activationWatcher2 close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["watcher4 close", "activationWatcher3 close", "activationWatcher2 close", "activationWatcher1 close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["watcher4 close", "activationWatcher3 close", "activationWatcher2 close", "activationWatcher1 close", "freeWatcher close"]);
+}, "3 user activations let you have 3 + 1 = 4 ungrouped close watchers/0 cancel events");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+  const activationWatcher1 = await createBlessedRecordingCloseWatcher(t, events, "activationWatcher1");
+  activationWatcher1.addEventListener("cancel", e => e.preventDefault());
+
+  await test_driver.bless("call activationWatcher1.close()", () => activationWatcher1.close());
+  assert_array_equals(events, ["activationWatcher1 cancel"]);
+
+  // This time we go straight to close, without a second cancel.
+  activationWatcher1.close();
+  assert_array_equals(events, ["activationWatcher1 cancel", "activationWatcher1 close"]);
+
+  freeWatcher.close();
+  assert_array_equals(events, ["activationWatcher1 cancel", "activationWatcher1 close", "freeWatcher close"]);
+}, "3 user activations let you have 2 close watchers with 1 cancel event, even if the first cancel event is prevented");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher1 = createRecordingCloseWatcher(t, events, "freeWatcher1");
+
+  freeWatcher1.destroy();
+  assert_array_equals(events, []);
+
+  const freeWatcher2 = createRecordingCloseWatcher(t, events, "freeWatcher2");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher2 close"]);
+}, "destroy()ing the free CloseWatcher allows a new free one to be created without user activation, and it receives the close signal");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher1 = createRecordingCloseWatcher(t, events, "freeWatcher1");
+
+  freeWatcher1.close();
+  assert_array_equals(events, ["freeWatcher1 close"]);
+
+  const freeWatcher2 = createRecordingCloseWatcher(t, events, "freeWatcher2");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher1 close", "freeWatcher2 close"]);
+}, "close()ing the free CloseWatcher allows a new free one to be created without user activation, and it receives the close signal");
+
+promise_test(async t => {
+  const events = [];
+  const freeWatcher1 = createRecordingCloseWatcher(t, events, "freeWatcher1");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher1 close"]);
+
+  const freeWatcher2 = createRecordingCloseWatcher(t, events, "freeWatcher2");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher1 close", "freeWatcher2 close"]);
+}, "closing the free CloseWatcher via a close signal allows a new free one to be created without user activation, and it receives a second close signal");
+
+promise_test(async t => {
+  const events = [];
+  const activationWatcher = await createBlessedRecordingCloseWatcher(t, events, "activationWatcher");
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher close", "activationWatcher close"]);
+}, "The second watcher can be the free watcher, if the first is created with user activation");
+
+promise_test(async t => {
+  const events = [];
+  const activationWatcher1 = await createBlessedRecordingCloseWatcher(t, events, "activationWatcher1");
+  const activationWatcher2 = await createBlessedRecordingCloseWatcher(t, events, "activationWatcher2");
+  const freeWatcher = createRecordingCloseWatcher(t, events, "freeWatcher");
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher close", "activationWatcher2 close"]);
+
+  await sendCloseSignal();
+  assert_array_equals(events, ["freeWatcher close", "activationWatcher2 close", "activationWatcher1 close"]);
+}, "The third watcher can be the free watcher, if the first two are created with user activation");
+</script>