We talked about this at the DOM work week a day or two ago.  Kyle has a patch 
in progress.  There are some other things that have to be done for it to work 
that I don't recall.

Andrew

----- Original Message -----
> We're going to want to add worker bindings for canvas (both 2D and
> WebGL).
> Over time I expect we'll want worker versions of almost every popular
> DOM
> API that doesn't actually require content/layout. We need to be able
> to
> share code between worker and main-thread implementations as much as
> possible. Right now a major blocker for that is that main-thread DOM
> APIs
> require cycle collection and workers can't use cycle collection. So,
> what
> are the prospects for supporting cycle collection in workers? (I'm
> talking
> about independent cycle collectors for each thread, not any kind of
> cross-thread CC.)
> 
> Rob
> --
> Wrfhf pnyyrq gurz gbtrgure naq fnvq, “Lbh xabj gung gur ehyref bs gur
> Tragvyrf ybeq vg bire gurz, naq gurve uvtu bssvpvnyf rkrepvfr
> nhgubevgl
> bire gurz. Abg fb jvgu lbh. Vafgrnq, jubrire jnagf gb orpbzr terng
> nzbat
> lbh zhfg or lbhe freinag, naq jubrire jnagf gb or svefg zhfg or lbhe
> fynir
> — whfg nf gur Fba bs Zna qvq abg pbzr gb or freirq, ohg gb freir, naq
> gb
> tvir uvf yvsr nf n enafbz sbe znal.” [Znggurj 20:25-28]
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