Turn off Chrome/Safari spell checking by HTML/css

Yes, there is the HTML5 spellcheck attribute.

<textarea spellcheck="false"> or <input type="text" spellcheck="false">

http://www.whatwg.org/specs/web-apps/current-work/multipage/editing.html#spelling-and-grammar-checking

Update: This is now supported in the latest versions of all browsers.

This works in Safari 7.1 and should work also in others:

<input autocomplete="off" autocorrect="off" autocapitalize="off" 
spellcheck="false"/>

Only spellcheck="false" didn't work.

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