…lementation. Tested against mentioned browsers, plus Opera 10.10, 10.63, 11 alpha (all show the odd behavior of allowing text selection but not truly passing pointer events through to underlying elements), MSIE 8, 9 beta (PP6 appears unchanged -- http://msdn.microsoft.com/en-us/ie/ff468705.aspx).
Note to anybody linking the master branch on their sites: the master branch *will* break as the script gets updated.
… the GridOverlay object to hashgrid. Fixed crash when using with disabled CSS.