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Text is easier to read when it is accompanied with styling information, such as color, font attributes (weight, posture), or underlining, and this styling is customized appropriately for the output device.
GNU libtextstyle provides an easy way to add styling to programs that produce output to a console or terminal emulator window. It does this in a way that allows the end user to customize the styling using the industry standard, namely Cascading Style Sheets (CSS).