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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-prevent-autofocus.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-prevent-autofocus.html
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index 0000000000..4d1e792c1c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focusing-steps-prevent-autofocus.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/interaction/focus/the-autofocus-attribute/resources/utils.js"></script>
+<body>
+<dialog></dialog>
+<script>
+// https://github.com/whatwg/html/issues/4788
+promise_test(async () => {
+ const dialog = document.querySelector('dialog');
+ dialog.show();
+ dialog.close();
+ const input = document.createElement('input');
+ input.autofocus = true;
+ document.body.insertBefore(input, dialog);
+ await waitUntilStableAutofocusState();
+ assert_not_equals(document.activeElement, input,
+ 'Non-dialog autofocus processing should be skipped.');
+}, 'After showing a dialog, non-dialog autofocus processing won\'t work.');
+</script>
+</body>