UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36

Steps to reproduce the problem:
1. Bind test function to window.onabort 
2. Load a page that takes a few seconds to load (https://fetch-progress.anthum.com/test/abort-event.html)
3. call window.stop(), press ESC, or click browser stop button

What is the expected behavior?
An event named "abort" should fire on the Window document and possibly the underlying <img> tag that did not finish loading.

According to HTML Living Standard "7.8.12 Aborting a document load", the abort event should fire:
https://html.spec.whatwg.org/multipage/browsing-the-web.html#aborting-a-document-load

What went wrong?
The "abort" event is not fired on Window, Document, or the underlying <img> tag loading

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 64.0.3282.186  Channel: stable
OS Version: OS X 10.11.6
Flash Version: 

I'm hoping to update the MDN documentation to inform users whether this is a bug or outdated specification:
https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onabort

I also opened up an issue in whatwg/html GitHub:
https://github.com/whatwg/html/issues/3525