This is why I hate spell checkers. Each word in the post is spelled correctly, yet it is grammatically and syntactically incorrect.
That said, I guess chrome is spell checking on the fly because it underlines words that I spell incorrectly. Doesn't know about technical words or acronyms, etc., which as a technical forum you would never expect it to.
If you're developing web content, I would recommend using a word processor to develop the content and then paste it in. Word processors will help with the spelling, grammar, punctuation, and syntax.
If you're not developing web content (i.e. blogs, wiki pages, or forum posts), well then you can still use a word proc if you're concerned about all those things, or you can use a browser that at least will help you by highlighting spelling issues.
