This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
See this thread: http://lists.w3.org/Archives/Public/public-whatwg-archive/2013Jan/thread.html#msg263
Any implementor interest in this?
I'm not aware of any at Mozilla at the moment, since it's doable with temporary canvases.
Closing issue due to lack of implementer and web developer interest. To re-open, please enter a new issue at https://github.com/whatwg/html/issues