diff --git a/close-watcher/popover-closewatcher-multiple-plus-free.html b/close-watcher/popover-closewatcher-multiple-plus-free.html
new file mode 100644
index 00000000000000..2982e29e264fa2
--- /dev/null
+++ b/close-watcher/popover-closewatcher-multiple-plus-free.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/pull/9462">
+<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>
+
+<button id=b0>b0</button>
+
+<div id=p1 popover=auto>
+  <button id=b1>b1</button>
+
+  <div id=p2 popover=auto>
+    <button id=b2>b2</button>
+
+    <div id=p3 popover=auto>p3</div>
+  </div>
+</div>
+
+<script>
+const escapeKey = '\uE00C';
+
+promise_test(async () => {
+  p1.showPopover();
+  await test_driver.click(b1);
+  p2.showPopover();
+  p3.showPopover();
+  assert_true(p1.matches(':popover-open'), 'p1 should be open.');
+  assert_true(p2.matches(':popover-open'), 'p2 should be open.');
+  assert_true(p3.matches(':popover-open'), 'p3 should be open.');
+
+  await test_driver.send_keys(p3, escapeKey);
+  assert_true(p1.matches(':popover-open'), 'first escape: p1 should be open.');
+  assert_false(p2.matches(':popover-open'), 'first escape: p2 should be closed.');
+  assert_false(p3.matches(':popover-open'), 'first escape: p3 should be closed.');
+
+  await test_driver.send_keys(p1, escapeKey);
+  assert_false(p1.matches(':popover-open'), 'second escape: p1 should be closed.');
+  assert_false(p2.matches(':popover-open'), 'second escape: p2 should be closed.');
+  assert_false(p3.matches(':popover-open'), 'second escape: p3 should be closed.');
+}, 'Multiple popovers opened from a single user activation close together, but original popover closes separately.');
+</script>
diff --git a/close-watcher/popover-closewatcher.html b/close-watcher/popover-closewatcher.html
new file mode 100644
index 00000000000000..6695f2bc4912c8
--- /dev/null
+++ b/close-watcher/popover-closewatcher.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/pull/9462">
+<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>
+
+<button id=b0>b0</button>
+
+<div id=p1 popover=auto>
+  <button id=b1>b1</button>
+
+  <div id=p2 popover=auto>
+    <button id=b2>b2</button>
+
+    <div id=p3 popover=auto>p3</div>
+  </div>
+</div>
+
+<script>
+const escapeKey = '\uE00C';
+
+promise_test(async () => {
+  p1.showPopover();
+  p2.showPopover();
+  p3.showPopover();
+  assert_true(p1.matches(':popover-open'), 'p1 should be open.');
+  assert_true(p2.matches(':popover-open'), 'p2 should be open.');
+  assert_true(p3.matches(':popover-open'), 'p3 should be open.');
+
+  await test_driver.send_keys(p3, escapeKey);
+  assert_false(p1.matches(':popover-open'), 'p1 should be closed.');
+  assert_false(p2.matches(':popover-open'), 'p2 should be closed.');
+  assert_false(p3.matches(':popover-open'), 'p3 should be closed.');
+}, 'Opening multiple popovers without user activation causes them all to be closed with one close signal.');
+
+promise_test(async () => {
+  await test_driver.click(b0);
+  p1.showPopover();
+  await test_driver.click(b1);
+  p2.showPopover();
+  await test_driver.click(b2);
+  p3.showPopover();
+  assert_true(p1.matches(':popover-open'), 'p1 should be open.');
+  assert_true(p2.matches(':popover-open'), 'p2 should be open.');
+  assert_true(p3.matches(':popover-open'), 'p3 should be open.');
+
+  await test_driver.send_keys(p3, escapeKey);
+  assert_true(p1.matches(':popover-open'), 'first escape: p1 should be open.');
+  assert_true(p2.matches(':popover-open'), 'first escape: p2 should be open.');
+  assert_false(p3.matches(':popover-open'), 'first escape: p3 should be closed.');
+
+  await test_driver.send_keys(p2, escapeKey);
+  assert_true(p1.matches(':popover-open'), 'second escape: p1 should be open.');
+  assert_false(p2.matches(':popover-open'), 'second escape: p2 should be closed.');
+  assert_false(p3.matches(':popover-open'), 'second escape: p3 should be closed.');
+
+  await test_driver.send_keys(p1, escapeKey);
+  assert_false(p1.matches(':popover-open'), 'third escape: p1 should be closed.');
+  assert_false(p2.matches(':popover-open'), 'third escape: p2 should be closed.');
+  assert_false(p3.matches(':popover-open'), 'third escape: p3 should be closed.');
+}, 'Opening multiple popovers with user activation should close one at a time with close signals.');
+</script>
