[whatwg] Synchronizing Canvas updates in a worker to DOM changes in the UI thread

[Kyle Huey]

On Sun, Oct 20, 2013 at 11:33 PM, Glenn Maynard <glenn at bluegoji.com> wrote:

> It must not be possible for the UI thread to detect whether present() did
> anything--if there's no frame in the ready buffer, nothing changes and the
> UI thread can't detect this.  Similarly, it must not be possible for the
> rendering thread to detect if the ready frame has been presented.  These
> rules are to prevent exposing asynchronous behavior.
>

Well you can readback from <canvas>es, so how is that going to work?

- Kyle