Is x a reserved keyword in Javascript FF/Safari not in IE?

Question

A web page of a web application was showing a strange error. I regressively removed all the HTML/CSS/JS code and arrived to the basic and simple code below.

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Answer 1

Your problem is with variable scope, not that "x" is reserved. An image object has a property named "x". You can see this with Chrome's developer tools. When you call "alert(x);" on the image object, the "x" in scope is the "x" property on the image.