The pop-up menu that appears when you right-click on a mis-spelt word in a web form text field in Webkit does not include any suggestions for the correct way to spell the word. I will attach screen shots from Safari (which works properly) and Webkit showing this misbehavior.
Created attachment 13436 [details]
Screen capture showing empty spell-check menu in WebKit
The mis-spelt word is 'teh'
Created attachment 13438 [details]
Screen capture showing spell-suggest working correctly in Safari
Same word, same form, using the retail version of Safari instead of the latest nightly build.
This is a known incompatibility with the nightly WebKit builds:
*** This bug has been marked as a duplicate of 12761 ***