CSS was first proposed in 1994 by Håkon Wium Lie, a Norwegian computer scientist and web developer.
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CSS allows you to separate the presentation of a website from its structure and content, which makes it easier to maintain and update the look and feel of a website.
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CSS is used to style and layout web pages, and can be used to create a wide range of visual effects, such as animations, gradients, and responsive design.
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CSS has several different versions, the latest version is CSS3, which was first released in 1999 and is still under development.
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CSS has a wide range of properties and selectors that can be used to style different elements on a web page, such as text, images, and links.
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CSS has several different layout models, such as block, inline and table layout, which can be used to create different types of layouts for web pages.
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CSS can be written in a .css file and linked to HTML pages, or it can be written in-line in the HTML pages, or it can be written using JavaScript.
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CSS can be used to create responsive web designs that automatically adjust to different screen sizes and resolutions.
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CSS has a feature called "media query" which allows to create styles that apply only when certain conditions are met, such as the screen size or resolution.
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CSS has a preprocessor language like SASS, LESS and Stylus which adds more functionalities and a more organized way to write css.
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CSS has a library called CSS Grid and CSS Flexbox, which allows creating complex and dynamic layout easily.
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CSS has a feature called "pseudo-classes" and "pseudo-elements" which allows to select and style certain elements based on their state or position within the document.