yes, but support seems still to be lacking.

Despite the fact you're right this is not what I was initially interested in. For me it's just small games or applicatons anyway, and today's systems will be able to handle those good enough.

most current pcs already are faster than the current console generation so it's no big deal if javascript consumes the difference.

but i also see the advantage in smaller games. it's extremely cool that it's not necessary to download or install anything. just visit a webpage. for example i very rarely checked out games by people on this forum because i just found the downloading, unzipping or worse, installing and cleaning up afterwards way too annoying to be worth it. (and by the way every game you downloaded potentially was a much bigger security risk than webgl is. it just could have wiped my harddisk.)