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CSS is intended primarily to modify the separation of document content from document presentation, together with aspects like the layout, colors, and fonts. This separation will improve content accessibility, offer a lot of flexibility and management within the specification of presentation characteristics, modify multiple HTML pages to share data format by specifying the relevant CSS in a very separate .css file, and scale back complexness and repetition within the structural content.
Separation of data format and content makes it potential to gift a similar markup page in several designs for various rendering strategies, like on-screen, in print, by voice (via speech-based browser or screen reader), and on Braille-based tactile devices. It also can show the net page otherwise counting on the screen size or viewing device. Readers also can specify a special piece of paper, like a CSS file hold on on their own pc, to override the one the author such.
"The W3C operates a free CSS validation service for CSS documents."