Automatically created variables from ids in JS? [duplicate]

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ECMAScript 5 strict should help with this as you cannot use undeclared variables. I’m not sure which browsers currently support strict mode but I know Firefox 4 does.

The HTML spec you linked mentions a proposal to reduce pollution of the global scope by limiting this behavior to quirks-only.

I don’t know if this feature is in the original spec but I do expect it to be removed, prohibited or otherwise nullified in subsequent versions of ECMAScript. ES6 will be based on ES5 strict.

JavaScript has many features that make it easier to use for beginners and novices, I suspect this is one such feature. If you’re a professional and you want quality code use "use strict"; and always JSLint your code. If you use these guidelines this feature should never bother you.

Here is a useful video about ES5 courtesy of YUI Theater (it’s already 2 years old though, but still relevant currently as there is no ES6 yet).

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