DRSK

Update:

This log message is related to jQuery 1.6.x (was fixed in 1.7.x; Removed Features @ http://blog.jquery.com/2011/11/03/jquery-1-7-released/ ) — with the next update of jQuery in Aloha this will be fixed.
– evo42 @ github

From jQuery blog

REMOVED FEATURES

event.layerX and event.layerY: We have removed these non-standard properties in version 1.7. Although we normally would have gone through a deprecation notice period for these, Chrome version 16 generates a flood of console warning messages on the page. Because of this, we decided to remove them immediately. On platforms that still support these properties, they are available through event.originalEvent.layerX and event.originalEvent.layerY.

Thought it was worth updating for people wondering!