Sorry for typo and broken formatting.

What is the usecase? The document is always visible.

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Agreed on the question about use case. If you're trying to determine whether the page is visible on the screen you might use the Page Visibility API.

This bug was noticed in code, that processed all events on the page in the following way:

• get a list of all events grouped by element
• if element is not visible (filter(':visible').length === 0) then skip it
• otherwise do something with events

That silently skipped all live events on the page.

So I wouldn't think too much of the use case - you just never know when somebody writes similar code that looks completely correct but causes unexpected behavior.

get a list of all events grouped by element

Which documented method gives you that list?

This isn't much different than other invalid uses of an API call or selector, for example $(document).append("hello") or $(window).find("body") don't work either.

Since the document isn't an element, you need to remove it from the collection. Same goes for the window object or plain objects, which are sometimes wrapped in a jQuery collection.

Replying to [comment:6 dmethvin]:

> get a list of all events grouped by element Which documented method gives you that list?

That is custom code (reading jQuery.cache). It is used to visualize all events on the page.

Really have nothing more to say, just small inconsistency that was found in real code (not production though).

jQuery.cache is not a documented public API and user code should never access it.

#12111 is a duplicate of this ticket.