I have been adding animation features to Nightly in an experimental revision phabricator.services.mozilla.com/D46887 with the eventual goal of making a proposal to the W3C.

Up to now everything I've implemented has been more or less trivial. I've finally hit something difficult and was hoping for some advice.

I want to implement versions of Element.getBoundingClientRect() and Element.getClientRects() that do not include animation values.

(The animation pattern I have been proposing for years does not need calculated animated values for interruption, and can even reverse or blend CSS Animations.)

If anyone can share some insight I would greatly appreciate it

I've spent awhile investigating and do have an idea of what to dig into, and will be able to ask more specific questions eventually if this one is too vague

Also, the reason why I want to implement before proposing is so I can be very specific and create examples

I'll check the IRC logs if I'm not around but will understand if no one has anything to offer