no restrictions!! so if you write it for IE6+... as long as the basic functionality still works on opera/mozila etc.
So if you have a script that will do lots of cool things on IE... that is fine but the main functionality should also run on non-javascript browsers.... even if the jazzy client-side scripts fail. So it may be a good idea to do a check for browser version and/or client-side script enabled!! to know what to give the browser.
Saying that... it's up to you, these are only suggestions.
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