Feature Idea - :ancestor action option

[nakajima a.k.a. nazomikan]

There are many cases where a child element wants to listen to events of its ancestor element and act on them.
In such cases, it is common to use @document or @window.
However, it is often necessary to care whether or not the event was originated by its own ancestor.
How about providing some assurance of that in the action option?
If it looks good I will make a PR.

code

app.registerActionOption('ancestor', ({ event, element }) => {
  return event.target.contains(element);
});

syntax

data-action="disclousre:open@document->content-loader#load:ancestor:once"

example:

https://codepen.io/Takuya-Nakajima/pen/eYQbVwa?editors=1010