Re: Specifying window.performance.now()

On Wed, Feb 29, 2012 at 1:55 PM, Boris Zbarsky <bzbarsky@mit.edu> wrote:

> On 2/29/12 4:52 PM, James Robinson wrote:
>
>> Technically speaking using the parameter to track animation progress is
>> OK, so long as the page isn't trying to compare the parameter to JS
>> Date.now()s.
>>
>
> It's hard to track progress without comparing to "the time I started the
> animation".
>
> And that last is only available via Date.now in most UAs.  :(
>
>
>  My reading of the code that Google Maps is using for animations today is
>> that it's always using the value of Date.now() to update its internal
>> progress.
>>
>
> Good!  Well, bad for the actual behavior of the animations, but good for
> making this backwards-incompatible change.  ;)


Agree on both points.  We need to change our behavior before authors get
their act together!

I think we're willing to make the change to requestAnimationFrame for
WebKit and see how it goes.  Would Mozilla and Microsoft be willing to try
it as well?

- James


>
> -Boris
>