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[Bug 20246] Provide a system to observe nodes entering and leaving the viewport

From: <bugzilla@jessica.w3.org>
Date: Thu, 06 Dec 2012 18:21:34 +0000
To: public-css-bugzilla@w3.org
Message-ID: <bug-20246-5148-8CQgYQ33Pn@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=20246

--- Comment #8 from louisremi <lrbabe@gmail.com> ---
@jakearchibald from what I understand about browser rendering engine, it is
very tricky to determine when an element is visible or not, as "what is
rendered on the screen" is the result of many operations on different levels,
some of them being trusted to the hardware. (anyone more knowledgeable than me
on the matter: correct me if I'm wrong).

It is usually easier for the developer to know what CSS might affect the
visibility of an element, and ViewportObserver would provide the missing piece
of information to decide when animations should be turned on and off.

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