Re: [heycam/webidl] Propagate active script to callbacks (#902)

+1 for making active script the ScriptOrModule component of the incumbent.
Active script and incumbent have similar intention, and the concept of incumbent is already complicated (e.g. https://github.com/whatwg/html/issues/1430). It's better to merge active script into incumbent and maintain the incumbent spec/impl as the single source of truth.

I also suspect the current browsers implementation is more like referring the incumbent rather than the current specification of active script, according to cases where a script triggers event firing synchronously.
WPT: https://github.com/web-platform-tests/wpt/pull/24305
In such cases, https://html.spec.whatwg.org/multipage/webappapis.html#skip-when-determining-incumbent-counter makes the incumbent's script and the active script different.

(Thanks @yuki3, the chat we had today was quite helpful for me!)

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