... plotted over time on the x axis and length on the y-axis to be really useful.
I've heard/read that some JavaScript minifiers add in return characters b.c. some browsers have a maximum line length that can be rendered. What is it for modern browsers? FF, IE, Safari, and Chrome. Any will suffice as a starting point.
I've also heard that breaking the lines up is for firewalls and proxies which have a maximum length that can be parsed. Google closure puts this at around 500 lines.
But this question regards the browsers capabilities.
Here is a link to information that puts the browser issue, at around 32K.
https://github.com/mishoo/UglifyJS
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There is definitely some consistency lacking in what minifiers think this needs to be set to.