1 files changed, 66 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/popovers/popover-open-in-beforetoggle.html b/testing/web-platform/tests/html/semantics/popovers/popover-open-in-beforetoggle.html
new file mode 100644
index 0000000000..1e22b73c68
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/popovers/popover-open-in-beforetoggle.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>Popover beforetoggle event opening new popovers</title>
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/indices.html#event-beforetoggle">
+<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="resources/popover-utils.js"></script>
+
+<div popover id=p1>Popover 1
+  <div popover id=p2>Popover 2
+    <div popover id=p3>Popover 3</div>
+  </div>
+</div>
+<div id=outside>Outside</div>
+<dialog id=dialog>Dialog</dialog>
+
+<script>
+  function getSignal(t) {
+    const controller = new AbortController();
+    t.add_cleanup(() => controller.abort());
+    return controller.signal;
+  }
+
+  test((t) => {
+    p1.showPopover();
+    p1.addEventListener('beforetoggle',() => p2.showPopover(),{signal: getSignal(t)});
+    p1.hidePopover(); // Potential crash here
+    assert_false(p1.matches(':popover-open'));
+    assert_false(p2.matches(':popover-open'));
+  },'Open popover from closing beforetoggle event');
+
+  test((t) => {
+    p1.showPopover();
+    p1.addEventListener('beforetoggle',() => p2.showPopover(),{signal: getSignal(t)});
+    p2.addEventListener('beforetoggle',() => p3.showPopover(),{signal: getSignal(t)});
+    p1.hidePopover(); // Potential crash here
+    assert_false(p1.matches(':popover-open'));
+    assert_false(p2.matches(':popover-open'));
+    assert_false(p3.matches(':popover-open'));
+  },'Open double-nested popovers from closing beforetoggle event');
+
+  test(t => {
+    p1.showPopover();
+    p1.addEventListener('beforetoggle',() => p2.showPopover(),{signal: getSignal(t)});
+    p2.addEventListener('beforetoggle',() => p3.showPopover(),{signal: getSignal(t)});
+    dialog.showModal(); // Potential crash here
+    assert_false(p1.matches(':popover-open'));
+    assert_false(p2.matches(':popover-open'));
+    assert_false(p3.matches(':popover-open'));
+    dialog.close();
+  },'Open double-nested popovers from closing beforetoggle event, dialog open');
+
+  promise_test(async t => {
+    p1.showPopover();
+    p1.addEventListener('beforetoggle',() => p2.showPopover(),{signal: getSignal(t)});
+    p2.addEventListener('beforetoggle',() => p3.showPopover(),{signal: getSignal(t)});
+    await clickOn(outside); // Potential crash here
+    assert_false(p1.matches(':popover-open'));
+    assert_false(p2.matches(':popover-open'));
+    assert_false(p3.matches(':popover-open'));
+  },'Open double-nested popovers from closing beforetoggle event, light dismiss');
+</script>