Port popover test to WPT and adjust for close requests

Bug: 1171318
Change-Id: Ib93ed061919d0e9fb1391d76291dd1e391bb209c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4970913
Reviewed-by: Mason Freed <masonf@chromium.org>
Commit-Queue: Domenic Denicola <domenic@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1215271}
diff --git a/html/semantics/popovers/popover-close-request.html b/html/semantics/popovers/popover-close-request.html
new file mode 100644
index 0000000..f0d2aa1
--- /dev/null
+++ b/html/semantics/popovers/popover-close-request.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Popover close request behavior</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/close-watcher/resources/helpers.js"></script>
+<script src="resources/popover-utils.js"></script>
+
+<div popover id=p1>
+  Inside popover 1
+  <div popover id=p2>Inside popover 2</div>
+</div>
+
+<script>
+promise_test(async () => {
+  const popover1 = document.querySelector('#p1');
+  const popover2 = document.querySelector('#p2');
+
+  popover1.showPopover();
+
+  // Bless the opening of popover2, so it doesn't get grouped with popover1 by
+  // the close watcher infrastructure.
+  await blessTopLayer(popover1);
+  popover2.showPopover();
+
+  assert_true(popover1.matches(':popover-open'), "Starting: popover1 must be open");
+  assert_true(popover2.matches(':popover-open'), "Starting: popover2 must be open");
+
+  await sendCloseRequest();
+  assert_true(popover1.matches(':popover-open'), "After one close request, popover1 must be open");
+  assert_false(popover2.matches(':popover-open'), "After one close request, popover2 must be closed");
+
+  await sendCloseRequest();
+  assert_false(popover1.matches(':popover-open'), "After two close requests, popover1 must be closed");
+  assert_false(popover2.matches(':popover-open'), "After two close requests, popover2 must be closed");
+});
+</script>