| <!DOCTYPE html> |
| <title>onmessageerror content attribute</title> |
| <link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me"> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/#handler-onmessageerror"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <body> |
| |
| <script> |
| "use strict"; |
| window.messageErrorHappened = false; |
| |
| function cleanup() { |
| window.messageErrorHappened = false; |
| document.body.removeAttribute("onmessageerror"); |
| } |
| |
| test(() => { |
| assert_equals(document.body.onmessageerror, null, "body"); |
| assert_equals(window.onmessageerror, null, "window"); |
| }, "The default value of onmessageerror is null"); |
| |
| test(t => { |
| t.add_cleanup(cleanup); |
| |
| document.body.setAttribute("onmessageerror", "window.messageErrorHappened = true;") |
| const compiledHandler = document.body.onmessageerror; |
| |
| assert_equals(typeof compiledHandler, "function", "The onmessageerror property must be a function"); |
| compiledHandler(); |
| assert_true(window.messageErrorHappened, "Calling the handler must run the code"); |
| }, "The onmessageerror content attribute must be compiled into the onmessageerror property"); |
| |
| test(t => { |
| t.add_cleanup(cleanup); |
| |
| document.body.setAttribute("onmessageerror", "window.messageErrorHappened = true;") |
| |
| window.dispatchEvent(new Event("messageerror")); |
| |
| assert_true(window.messageErrorHappened, "Dispatching the event must run the code"); |
| }, "The onmessageerror content attribute must execute when an event is dispatched on the window"); |
| </script> |
