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0.4. Conventions in This Book

Constant Width

is used for HTTP headers, status codes, MIME content types, directives in configuration files, arrays, operators, variable names (except in examples), and computer output in text.


is used for filenames, pathnames, newsgroup names, Internet addresses (URLs), email addresses, terms being introduced, commands, options/switches, program names, subroutine names, functions, methods, and hostnames.


is used for environment variables, HTML attributes, and HTML tags (within angle brackets <>).

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