A: 

At the moment I don't think there are any browsers that support ECMAScript 5th Edition.

There is a good write up on it at http://en.wikipedia.org/wiki/ECMAScript

AutomatedTester  2010-02-28 10:07:52
A: 

I don't think that strict mode is currently supported by any browser ; for instance, the page about ECMAScript 5 support in Mozilla is quite poor -- and Mozilla's engine is generally not the worse one...

And browsers generally tend to support ECMAScript 3...


As a reference for those who might read this question an wonder "what is strict mode ?", here's an interesting post about it : ECMAScript 5 Strict Mode, JSON, and More

Pascal MARTIN  2010-02-28 10:09:37

related questions

What JavaScript patterns do you use most?
Javascript events
What style do you use for creating an "class" in JavaScript?
Graphing JavaScript Library
What's the difference in closure style
Getting the text from a drop-down box
How to specify javascript to run when ModalPopupExtender is shown
Length of Javascript Associative Array
How Do I Post and then redirect to an external URL from ASP.Net?
How to set up a CSS switcher in ASP.NET
Wrapping lists into columns
Javascript keyboard events primer? (or rather: help me with my custom dropdown)
Http Auth in a Firefox 3 bookmarklet
Best Debugging Tools for JavaScript/xulrunner Development
How can I turn a string of HTML into a DOM object in a Firefox extension?
Call ASP.NET Function From Javascript?
Javascript troubleshooting tools in IE
MAC addresses in JavaScript
Capturing TAB key in text box
CSS Background Color in Javascript
How can I make the browser see CSS and Javascript changes?
Triple Quotes? How do I delimit a databound Javascript string parameter in ASP.NET?
ASP .Net Custom Client-Side Validation
What JavaScript library would you choose for a new project and why?
Detecting font in JavaScript