I researched this a while ago and can\'t remember how to do it. I want to be able to prevent Firefox from running it\'s spell-checking functionality on certain input fields
Talk about having a big "duh" moment! I found the answer after some trial & error:
<textarea spellcheck="false"></textarea>
add the attribute using JQuery $('.textarea_className').attr('spellcheck',false);
This will allow you to return a valid XHTML mark up. =)
The "spellcheck" attribute is currently an extra feature available only in Firefox, but it is being considered for inclusion in HTML5.
The downside of this is that the W3 strict validator gives - Attribute "spellcheck" is not a valid attribute. Bad news for those of us with OCD that love to see 0 errors in validating our sites.