Warnings are better than it not working. It's what happens with different browsers, it's the way it is.

You can just ignore the warnings, because it will work but it just looks unprofessional

Google has warnings. Facebook has warnings. Hawkee has warnings.

Generally all syntax checkers for html/css should be disregarded. There is really no standardisation for it between browsers, and indeed if you are trying to create a responsive design, then almost no syntax checker will know what the hell its meant to be checking css wise.

No standard user will be checking the console, either. And those users that ARE checking the console will probably understand the difficulties of cross-browser compatibility and know that the warnings aren't going to eat them

I was not really talking about that topic, stuff like when you use

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<-- "HR should be an empty element tag" write it like this -->

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Just annoying

It both works, but ecplise just gives warnings for all of it

Sorry, I thought you were talking about console in the browser and not in eclipse haha.