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Re:Google HTML/CSS Style Guide – Omit Optional Tags by scrollaway on Saturday September 17, 2016 @04:32PM (#12522313)
Yes, think about all those bytes we could save by not sending doctype as uppercase!

In XML, it's required uppercase. Unlike HTML being lax on tag structure, there is no reason to advise DOCTYPE to be lowercase. It's not "better".

Re:Google HTML/CSS Style Guide – Omit Optional Tags by sheriffderek on Saturday September 17, 2016 @05:11PM (#12522475)
I'm not actually fighting for it... or talking about bytes. I care more about keystrokes. My fingers seem to prefer lowercase. OTHERWISE I can just SOMETIMES write THINGS in weiRD cASEe FOR no REASON.. but I have to hold shift or use caps-lock and "I'd prefer not to." https://www.youtube.com/watch?v=U-9tAqdd_4Y