I have to say that every time I need to get some information about javascript or html I always search for articles in the MDN (Mozilla Developer Ne...
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For just documentation? Yes, absolutely.
However, there are two other sites I find myself checking regularly when doing web development (not including documentation sites for specific libraries):
Good point the second one. I didn't know it so I will add to my set of useful tools.
For sure, not only for web technologies but for almost everything Stack Overflow is very useful!!!