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Re: CSS animation perf statistics

From: Bryan McQuade <bmcquade@google.com>
Date: Wed, 15 Jun 2011 07:57:42 -0700
Message-ID: <BANLkTin-tCRUbfbYxb9+4b+RPtz2aAeSiA@mail.gmail.com>
To: Paul Bakaus <pbakaus@zynga.com>
Cc: Sigbjørn Vik <sigbjorn@opera.com>, "public-web-perf@w3.org" <public-web-perf@w3.org>, Andrew Dupont <w3@andrewdupont.net>
+1. I don't feel strongly but I'll add that if one had multiple
animations (e.g. one for high framerate, one for slow framerate), an
additional max-fps attribute would be useful to pick one or the other
based on characteristics of the device.

On Wed, Jun 15, 2011 at 7:13 AM, Paul Bakaus <pbakaus@zynga.com> wrote:
> Am 15.06.11 15:12 schrieb "Sigbjørn Vik" unter <sigbjorn@opera.com>:
>>On Tue, 14 Jun 2011 23:05:30 +0200, Andrew Dupont <w3@andrewdupont.net>
>>> Mine was one of the aforementioned TXJS talks, so Kyle asked me to
>>> in.
>>> Let's imagine that there exists a set of animations that are only worth
>>> doing if you can be _somewhat_ sure they'll render at a certain frame
>>> rate. On mobile devices, most animations fall into this category. If
>>> writing a web app that will only be consumed in MobileSafari, I know I
>>> can transition/animate "opacity" and "transform" and know they'll
>>> animate smoothly.  But if my app will also be consumed by Android
>>> devices, I'm stuck; a few such devices support hardware acceleration,
>>> but most don't. On devices that lack support, I'd rather skip the
>>> animation altogether, because an animation running at 4 fps is worse
>>> than no animation at all.
>>Opera experimented with some related technology some time ago, see
>>Those demos still work in Opera 11.
>>That gave the developer currentFPS and targetFPS properties to play with.
>>A similar setup could be included in e.g. CSS, imagine the following:
>>@media (min-fps:30) {
>>       body { transition-property: opacity; transition-duration: 2s; }
>>Of course, a currentFPS property could additionally be added to the
>>RequestAnimationFrame specification.
> I love that. This would be a serious win if implemented across the board.
>>Sigbjørn Vik
>>Quality Assurance
>>Opera Software
Received on Wednesday, 15 June 2011 14:58:07 UTC

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