411 REFERENCE · Wikibooks
JavaScript/Working with the mouse
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
JavaScript Console Tests
Test x,y
window.onmouseover = function(){document.title = [event.x,event.y];};
Test offsetX,offsetY
window.onmouseover = function(){document.title = [event.offsetX,event.offsetY];};
Test clientX,clientY
window.onmouseover = function(){document.title = [event.clientX,event.clientY];};
Test pageX,pageY
window.onmouseover = function(){document.title = [event.pageX,event.pageY];};
References
Further reading
JavaScript Events
offsetX Property
CSS Object Model: Extensions to the mouseevent Interface
Creating an HTML5 Canvas Painting Application
DOM Events Portability: Not that Hard