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What is CSS?

  • CSS stands for Cascading Style Sheets
  • CSS describes how HTML elements are to be displayed on screen or in other media
  • CSS saves a lot of work. It can control the layout of multiple web pages all at once
  • Why we use CSS?
  • CSS is used to define styles for your web pages, including the design, layout and variations in display for different devices and screen sizes
  • cascading: determines how styles get applied to our web pages when there are conflicting rules.
    Styles define how to display HTML elements, describe the presentation of documents. It define sizes, spacing, fonts, colors, layout, etc.
    CSS rules are defined as a property name followed by a colon and then a property value.
    Styles were added to HTML 4.0 to solve a problem. When tags like font, and color attributes were added to the HTML 3.2 specification, it started a nightmare for web developers.
    Development of large web sites, where fonts and color information were added to every single page, became a long and expensive process.
    To solve this problem, the World Wide Web Consortium (W3C) created CSS.
    In HTML 4.0, all formatting could be removed from the HTML document, and stored in a separate CSS file. All browsers support CSS today.

  • External stylesheets are stored in CSS files

Download the CSS-3-Cheat-sheet for references