[whatwg] Reserved browsing context names

[Boris Zbarsky]

I was just looking at 
http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name 
and I noticed that there are some other magical (starting with '_') 
browsing context "names" that Gecko, at least supports.

These are "_content" and "_main"; they target the main browser rendering 
area.  I believe at least _main is supported in IE as well, or was at 
some point according to the Gecko code comments (we added _main for IE 
compat).  These are useful for UAs that allow a non-main rendering area 
(e.g. a sidebar) to allow links in it to trigger the main rendering area.

I think it would be good to add one or both of these to the spec.

-Boris