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- This WPT test may be referenced by the following Test IDs:
- /html/webappapis/scripting/events/event-handler-processing-algorithm-error/script-element.html - WPT Dashboard Interop Dashboard
<!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">
<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
<div id="log"></div>
<script>
"use strict";
promise_test(t => {
const script = document.createElement("script");
script.onerror = t.step_func((...args) => {
assert_equals(args.length, 1);
return true;
});
const eventWatcher = new EventWatcher(t, script, "error");
const promise = eventWatcher.wait_for("error").then(e => {
assert_equals(e.constructor, Event); // not ErrorEvent
assert_equals(e.defaultPrevented, false);
});
script.src = "404.js";
document.body.appendChild(script);
return promise;
}, "error event behaves normally (return true does not cancel; one arg) on a script element, with a 404 error");
promise_test(t => {
const script = document.createElement("script");
script.onerror = t.step_func((...args) => {
assert_equals(args.length, 1);
return true;
});
const eventWatcher = new EventWatcher(t, script, "error");
const promise = eventWatcher.wait_for("error").then(e => {
assert_equals(e.defaultPrevented, false);
});
script.dispatchEvent(new Event("error", { cancelable: true }));
return promise;
}, "error event behaves normally (return true does not cancel; one arg) on a script element, with a synthetic Event");
promise_test(t => {
const script = document.createElement("script");
script.onerror = t.step_func((...args) => {
assert_equals(args.length, 1);
return true;
});
const eventWatcher = new EventWatcher(t, script, "error");
const promise = eventWatcher.wait_for("error").then(e => {
assert_equals(e.defaultPrevented, false);
});
script.dispatchEvent(new ErrorEvent("error", { cancelable: true }));
return promise;
}, "error event behaves normally (return true does not cancel; one arg) on a script element, with a synthetic ErrorEvent");
</script>