Prototype of adding AbortController to addEventListener

I2P: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/9396JedBBOM This feature adds a new AbortSignal option, named "signal", to the options parameter of addEventListener. This new option can be used to remove the event listener with an AbortController by calling abort(). More context: whatwg/dom#911 Bug: 1146467 Change-Id: I8ab1b93ec8be859c6876296fda4a9b808253c7d3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527343 Commit-Queue: Joey Arhar <jarhar@chromium.org> Reviewed-by: Mason Freed <masonfreed@chromium.org> Cr-Commit-Position: refs/heads/master@{#826659}
web-platform-tests · Nov 12, 2020 · 612b2ed · 612b2ed
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commit 612b2ed
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diff --git a/dom/abort/addEventListenerAbortController.tentative.html b/dom/abort/addEventListenerAbortController.tentative.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+
+<!-- This behavior has not been specified yet. See https://github.com/whatwg/dom/issues/911 -->
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+
+<script>
+test(t => {
+  const target = new EventTarget();
+  const controller = new AbortController();
+
+  target.addEventListener('testevent', t.step_func(() => {
+    assert_unreached('testevent should have been canceled by AbortController');
+  }), {signal: controller.signal});
+
+  controller.abort();
+  target.dispatchEvent(new Event('testevent'));
+}, 'Tests support for EventController to cancel event listeners in addEventListener.');
+</script>