Indicates new terms, URLs, email addresses, filenames, file extensions, pathnames, directories, and Unix utilities

Indicates commands, options, switches, variables, attributes, keys, functions, types, classes, namespaces, methods, modules, properties, parameters, values, objects, events, event handlers, XML tags, HTML tags, macros, the contents of files, and the output from commands

Shows commands and other text that should be typed literally by the user

Shows text that should be replaced with user-supplied values