event-handler-processing-algorithm-non-booleans.html

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This WPT test may be referenced by the following Test IDs:
- /html/webappapis/events/event-handler-processing-algorithm-non-booleans.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Inline handlers returning non-boolean values</title>

<link rel="author" title="Dave Methvin" href="mailto:dave@methvin.com">

<link rel="help" href="https://html.spec.whatwg.org/multipage/webappapis.html#event-handler-attributes">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script>

"use strict";

test(() => {

  const div = document.createElement("div");

  document.body.appendChild(div);

  const e = new MouseEvent("click", { bubbles: true, cancelable: true });

  assert_equals(e.defaultPrevented, false);

  div.onclick = () => undefined;

  div.dispatchEvent(e);

  assert_equals(e.defaultPrevented, false);

}, "returning undefined from a click inline event handler does nothing");

</script>