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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-no-throw-requested-state.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-no-throw-requested-state.html
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+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-no-throw-requested-state.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/pull/9142">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<dialog>hello</dialog>
+
+<script>
+test(() => {
+ const dialog = document.querySelector('dialog');
+
+ // calling close() on a dialog that is already closed should not throw.
+ dialog.close();
+
+ dialog.show();
+ // calling show() on a dialog that is already showing non-modal should not throw.
+ dialog.show();
+ assert_throws_dom('InvalidStateError', () => dialog.showModal(),
+ 'Calling showModal() on a dialog that is already showing non-modal should throw.');
+ dialog.close();
+
+ dialog.showModal();
+ assert_throws_dom('InvalidStateError', () => dialog.show(),
+ 'Calling show() on a dialog that is already showing modal should throw.');
+ // calling showModal() on a dialog that is already showing modal should not throw.
+ dialog.showModal();
+});
+</script>