Request: support for detecting the websocket compression extensions, specified in https://tools.ietf.org/html/rfc7692 Compression Extensions for WebSocket

From https://www.igvita.com/2013/11/27/configuring-and-optimizing-websocket-compression/ there is currently mixed support:

Good news, browser support for the latest draft of “Compression Extensions” for WebSocket protocol — a much needed and overdue feature — will be landing in early 2014: Chrome M32+ (available in Canary already), and Firefox and WebKit implementations should follow.

Currently caniuse includes websockets themselves: http://caniuse.com/#search=websocket - but no extensions