javascript let not working in various browsers

let doesnt't work in some browsers. Not in their interpeters/ web consoles either. Why?

(originally I thought there was an inconsistency b/t the browser interpeter and the jsFiddle, but it turns out not to be true, just bad tests on my part.)

Answers:

Answer

It is a non-standard keyword introduced in JS 1.7, not necessarily implemented in different browsers.

https://developer.mozilla.org/en/JavaScript/Reference/Statements/let

Answer

In order to use some of the new features of JavaScript 1.7, you need to specify that you wish to use JavaScript 1.7. In HTML or XUL code, use

<script type="application/javascript;version=1.7"/>

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