Cascading Style Sheets [CSS] tell a web browser how to display the elements of a web page as it loads. CSS is used to specify colors, sizes, spacing, fonts, and so on; it sets the "style" for the text, headings, blocks of text and images on a web page. It is "cascading" because some elements inherit their font sizes and colors from the larger containing elements they are in. For example, the text in a <P> tag will be the same size and color as the <BODY> tag in which it is placed, unless otherwise specified.
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