diff --git a/html/dom/elements/global-attributes/onfocusin-onfocusout.html b/html/dom/elements/global-attributes/onfocusin-onfocusout.html
new file mode 100644
index 000000000000000..5fbd44c605f0fbe
--- /dev/null
+++ b/html/dom/elements/global-attributes/onfocusin-onfocusout.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/10234">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div tabindex=0>focusable div</div>
+
+<script>
+const div = document.querySelector('div');
+
+test(() => {
+  let firedFocusin = false;
+  div.onfocusin = () => firedFocusin = true;
+  div.focus();
+  assert_true(firedFocusin);
+}, 'element.onfocusin should add a focusin event listener.');
+
+test(() => {
+  div.focus();
+  let firedFocusout = false;
+  div.onfocusout = () => firedFocusout = true;
+  div.blur();
+  assert_true(firedFocusout);
+}, 'element.onfocusout should add a focusout event listener.');
+</script>
