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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal-remove.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal-remove.html
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--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal-remove.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>dialog element: removing from document after showModal()</title>
+<link rel=help href="https://html.spec.whatwg.org/multipage/interactive-elements.html#dom-dialog-showmodal">
+<link rel=help href="https://fullscreen.spec.whatwg.org/#removing-steps">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<dialog></dialog>
+<script>
+async_test(t => {
+ const dialog = document.querySelector('dialog')
+ dialog.showModal()
+ assert_true(dialog.open)
+ // The dialog element is now in top layer. Removing it should synchronously
+ // remove it from top layer, but should leave it in a strange limbo state.
+ dialog.addEventListener('close', t.unreached_func('close event'))
+ dialog.remove()
+ assert_true(dialog.open)
+ // if an event was queued, it would fire before this timeout
+ step_timeout(t.step_func_done(() => {
+ assert_true(dialog.open)
+ // pass if no close event was fired
+ }))
+})
+</script>