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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-keydown-preventDefault.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-keydown-preventDefault.html
new file mode 100644
index 0000000000..4a50b13c87
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-keydown-preventDefault.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Test cancel event with preventDefault on keydown event for dialog element</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <link rel="help" href="https://bugs.webkit.org/show_bug.cgi?id=227534">
+  <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1322947">
+</head>
+<body>
+<p>Test cancel event with preventDefault on keydown event for dialog element</p>
+<dialog>
+  <p>Hello World</p>
+</dialog>
+<script>
+  setup({ single_test: true });
+
+  var hasCancelEventFired = false;
+
+  const dialog = document.querySelector("dialog");
+
+  const verify = () => {
+    assert_false(hasCancelEventFired, "cancel should not be fired");
+    assert_true(hasKeydownEventFired, "document level keydown event should be fired");
+    done();
+  };
+
+  dialog.addEventListener("cancel", function(event) {
+    hasCancelEventFired = true;
+  });
+
+  document.addEventListener("keydown", function(event) {
+    hasKeydownEventFired = true;
+    event.preventDefault();
+    step_timeout(function() {
+      verify();
+    }, 0);
+  });
+  dialog.showModal();
+  test_driver.send_keys(document.documentElement, "\uE00C"); // ESC key
+</script>
+</body>
+</html>