mouse X:
mouse Y:
self.screen.height:
self.screen.height:
self.screen.width:
self.screen.availHeight:
self.screen.availWidth:
self.screenTop:
self.screenLeft:
self.screen.colorDepth:
document.body.clientHeight:
document.body.clientWidth:
document.body.scrollHeight:
document.documentElement.scrollHeight:
document.body.scrollWidth:
document.documentElement.scrollWidth:
document.body.scrollLeft:
document.body.scrollTop:
document.body.offsetHeight:
document.documentElement.offsetHeight:
document.body.offsetWidth:
document.documentElement.offsetWidth:

This square should always be in the middle of the screen (not browser)!