I disagree in full. There's much more than 2k-4k lines in a good javascript library. You've got years of bug fixing/perfomance improving and months of fixing b

I disagree in full. There's much more than 2k-4k lines in a good javascript library. You've got years of bug fixing/perfomance improving and months of fixing browser bugs. For example, try writing your own css selection framework and I guarantee it to be slower ones in prototype/jquery/mootools no matter what. If not in one browser then in another. You might want to modify your library, but you shouldn't start with bare hands for sure!