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Bug 1415761 - Catch the exception and rethrow it after invoking custom elements reactions;

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The spec was unclear on how CEReactions interact with thrown exceptions; see https://github.com/whatwg/html/issues/3217. The spec is now being clarified in https://github.com/whatwg/html/pull/3235.

Tag UXP Issue #1344
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Gaming4JC 2020-01-20 20:14:59 -05:00 • committed by Roy Tam
commit 5db13d0f4b
6 changed files with 50 additions and 8 deletions
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testing/web-platform/tests/custom-elements/reactions/with-exceptions.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Custom Elements: CEReactions interaction with exceptions</title>
<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
<meta name="help" content="https://html.spec.whatwg.org/multipage/#cereactions">
<meta name="help" content="https://github.com/whatwg/html/pull/3235">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/custom-elements-helpers.js"></script>
<div id="log"></div>
<script>
"use strict";
// Basically from https://github.com/whatwg/html/issues/3217#issuecomment-343633273
test_with_window((contentWindow, contentDocument) => {
let reactionRan = false;
contentWindow.customElements.define("custom-element", class extends contentWindow.HTMLElement {
disconnectedCallback() {
reactionRan = true;
}
});
const text = contentDocument.createTextNode("");
contentDocument.documentElement.appendChild(text);
const element = contentDocument.createElement("custom-element");
contentDocument.documentElement.appendChild(element);
assert_throws("HierarchyRequestError", () => text.before("", contentDocument.documentElement));
assert_true(reactionRan);
}, "Reaction must run even after the exception is thrown");
</script>