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CSS, short for Cascading Style Sheets, is a language used to control the presentation (including colors, layout, and fonts) of HTML and XHTML documents.

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When we use before it means, this css will apply (virtually) before the default content in html element, and vice-versa for after but the catch is these are called pseudo selectors, which does not … change the real DOM, i.e. the change would be visible but not real. Refer this to learn more about it : https://css-tricks.com/almanac/selectors/a/after-and-before/ …
answered Mar 6 '18 by OM The Eternity