ValveSoftware/source-sdk-2013 — pull request #116 by alanedwardes (2013-07-21 16:43:10+00:00)
Title: Custom URL handlers for the vgui::HTML panel now pass the URL and protocol.

In Source 2007, the vgui::HTML panel passed a KeyValues object containing `url` and `protocol`.

For custom URLs such as `test://foobar`, `url` would be `foobar` and `protocol` would be `test`.

In Source 2013, `protocol` was missing, and `url` was set to the protocol.