У вашего броузера проблема в совместимости с HTML5
Setting up the Mach3 2010 Screenset. Watch in Fullscreen 720p for best quality. Screenset available at
http://www.thecncwoodworker.com/2010.html
Note: Near the end I mention that the macro is incorrect for the simple Auto Zero, because it doesn't reset the scale. The macro IS correct. The simple auto zero only turns off the Z scale, because it doesn't do any XY movements. Sorry for the confusion.