html - What is the 80 columns rule? -

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i'm high school student , have create website tourism in computer sciences class. on criteria sheet, teacher has written "code should strive fit 80 columns possible ease of printing". have tried search answer , found out sort of rule can't wrap head around means. can me out? examples great.

like many rules of thumb, @ least partly based on opinion. derives widespread use of 80-column punched cards , video terminals through mid-1990s. , other rules, has been discussed @ length -- here:


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