[whatwg/dom] "inner invoke" of event listener with "once" doesn't mark listener as "removed" (Issue #1323)

### What is the issue with the DOM Standard?

[inner invoke](https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke) has this step for `once` listeners:

> 5. If listener’s [once](https://dom.spec.whatwg.org/#event-listener-once) is true, then [remove](https://infra.spec.whatwg.org/#list-remove) listener from event’s [currentTarget](https://dom.spec.whatwg.org/#dom-event-currenttarget) attribute value’s [event listener list](https://dom.spec.whatwg.org/#eventtarget-event-listener-list).

However, this doesn't prevent double invocation of the `once` listener, in particular when doing nested event dispatch such as in this WPT test: http://wpt.live/dom/events/remove-all-listeners.html

I believe the fix here is to have **inner invoke** set the [removed](https://dom.spec.whatwg.org/#event-listener-removed) flag on the listener, like programmatically removing the event listener would.

-- 
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/issues/1323
You are receiving this because you are subscribed to this thread.

Message ID: <whatwg/dom/issues/1323@github.com>