You might be a genius web designer, but if your site has a gazillion typos, it might falsely brand you as lazy, stupid or careless. Once you run spell check, proofread for errors. Even with spell check, mistakes can occur.
Recent example: After using spell check, “Thanks for your consideration,” became “Thanks for your consecration.”
Another example: After using spell check, “Sorry for the inconvenience,” became “Sorry for the incontinence.”
So, to avoid typo embarrassment, spell check, then proofread.
On another note, what is Chicken Kabok???