1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/frameset-element-synthetic-event.html b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/frameset-element-synthetic-event.html
new file mode 100644
index 0000000000..2fdca3ad86
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/frameset-element-synthetic-event.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Event handlers processing algorithm: error events</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-event-handler-processing-algorithm">
+
+<iframe name="framesetWindow" src="resources/frameset-frame.html"></iframe>
+<div id="log"></div>
+
+<script>
+"use strict";
+setup({ allow_uncaught_exception: true });
+
+window.onload = () => {
+
+const frameset = framesetWindow.document.querySelector("frameset");
+
+promise_test(t => {
+  frameset.onerror = t.step_func((...args) => {
+    assert_equals(args.length, 1);
+    return true;
+  });
+
+  const eventWatcher = new EventWatcher(t, framesetWindow, "error");
+  const promise = eventWatcher.wait_for("error").then(e => {
+    assert_equals(e.defaultPrevented, false);
+  });
+
+  frameset.dispatchEvent(new Event("error", { bubbles: true, cancelable: true }));
+
+  return promise;
+}, "error event is normal (return true does not cancel; one arg) on Window, with a synthetic Event");
+
+};
+</script>