Disable spell-checking on HTML textfields

Question

Can I somehow disable spell-checking on HTML textfields (as seen in e.g. Safari)?

Answer 1

Update: As suggested by a commenter (additional credit to How can I disable the spell checker on text inputs on the iPhone), use this to handle all desktop and mobile browsers.

Original answer: Javascript cannot override user settings, so unless you use another mechanism other than textfields, this is not (or shouldn't be) possible.