Add support for iframe key capture.

[ysmood]

Usage:

ikey = keymaster(
  document.getElementById('#iframe').contentWindow
);

ikey('ctrl+a', iframe_handler);

// Still compatible with the previous api.
key('ctrl+b', host_window_handler);

[Bucky24]

I'm also interested in having this sort of thing supported, how difficult would it be to get this updated and merged?

[jkupczak]

Any activity on this?

[elv1n]

If anyone needed I’ve rewrited keymaster https://github.com/elv1n/keybuddy and it supports creating a new instance with custom DOM element.