Don't and dont.
It works on my spell checker, and the one here on WikiAnswers.
The word is also slang and the computer gets used to reading it. ("learned ignore")
Because it's a contraction of "does not", and the apostrophe replaces the missing letter, it's doesn't.
That's is the contraction of that is, so you spelt it right. The apostrophe replaces the i, the missing letter.
Didn't. The apostrophe is used to indicate a missing letter (in this case, the 'o' of 'not'). Compare wouldn't, can't, shouldn't, aren't.
dare'ot is how you spell dare not with an apostrophe
This is spelt "apostrophe".
I'd
bosses'
No it only checks the spelling of the words you have typed.
I'd
The correct spelling is don't.
The correct spelling is apostrophe.
The contraction is spelled we're.