CSS (Cascading Style Sheets)
CSS is a style sheet language used to describe or define the presentation of a document by helping to literally separate display instruction (markup) from actual page content (HTML / XHTML / XML).
CSS allows us to remove much of the instructional definitions and define them within a separate file or files. By doing this, we reduce the file size of the content pages while also allowing the client browser the opportunity to cache these instructions rather than having to re-download them for each page view. This separation concept offers many potential functional advantages, including:
- Improved content accessibility
- Dramatic reduction of file sizes
- Greater control & flexibility over content display
- Simplifying style changes
- Allowing a different definitions to be used for displaying similar content on varying media (on-screen / mobile / print)
CSS has quickly become a current standard of page formatting and layout design tools.