Block Javascript Automatically Included

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I'm new to C5 and working on block development. For some reason, any javascript file in my block's 'js' directory is automatically included. Is this normal?

 
olliephillips replied on at Permalink Best Answer Reply
olliephillips
Yes it is. You'll see the same behaviour in themes too - and it also works for css. Anything in the blocks /css directory will also be included.
jordanlev replied on at Permalink Reply
jordanlev
I don't think this is the case for themes (at least I hope not, otherwise I've been building all my themes wrong!) -- only blocks.