jQuery Mouse Events: PageX/Y vs. ClientX/Y: "Which mouse event coordinates you should be using is not really a question for debate - the pageX and pageY coordinates are the ones that have been standardized by jQuery. In order to keep your code as cross-browser compatible as possible, you should rely on pageX and pageY. It is unfortunate that I did not know about this until just recently - I am quite sure that I have posted a lot of code that accidentally relied on the proprietary event properties, clientX and clientY."
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