Is there a way for a web developer to turn off Chrome/Safari/WebKit’s spellchecking on particular input or textarea elements? I mean either by special tag attribute or a proprietary CSS instruction.
There is a CSS instruction for turning off outlining of inputs so I thought that might also exist. I know how a user can do it.
Or, as a user, can I disable it for some particular domain?
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.