On Tue, Sep 29, 2015 at 4:36 PM, Patrick Walton <pwal...@mozilla.com> wrote:

> Well, the idea here is to test the case in which the object isn't
> layerized for some reason--say, the object was moving by animating
> "margin-left" in JavaScript and it had complex Z-ordering constraints that
> caused whatever layerization heuristics the browser had to fail, causing a
> full repaint of the affected area each frame. This is, of course, a
> pessimizing assumption :) But we do have reason to believe that this
> happens not infrequently in practice due to the multitude of ways to
> animate on the Web (see Paul Irish's writeups on this, for example). Much
> of the goal here is to make the baseline performance fast, so that even
> when our layerization code fails to produce the optimal result the user
> experience remains nice.
>

Sure, that makes sense.

Rob
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