In The best practice for referencing our CSS is to include all of our styles in a single external style order to get our CSS talking to our HTML.we need to reference our CSS file within our HTML. sheet, which is referenced from within the element of our HTML document.


The first CSS specification to become an official W3C Recommendation is CSS level 1, published on December 17, 1996. Håkon Wium Lie and Bert Bos are credited as the original developers


A superset of CSS 1, CSS 2 includes a number of new capabilities like absolute, relative, and fixed positioning of elements and z-index, the concept of media types, support for aural style sheets

CSS 2.1

CSS level 2 revision 1, often referred to as "CSS 2.1", fixes errors in CSS 2, removes poorly supported or not fully interoperable features and adds already implemented browser extensions to the specification.


CSS 3 is divided into several separate documents called "modules". Each module adds new capabilities or extends features defined in CSS 2, preserving backward compatibility.

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4 Things You Need To Know About Css

  • when the availability of CSS-capable browsers made CSS a viable technology, the adoption of CSS was still held back by designers' struggles with browsers' incorrect CSS implementation and patchy CSS support ”

  • CSS currently offers no way to select a parent or ancestor of an element that satisfies certain criteria.[51] CSS Selectors Level 4, which is still in Working Draft status, proposes such a selector,[52] but only as part of the "complete" selector profile, not the "fast" profile used in dynamic CSS styling. ”

  • A stylesheet, internal or external, specifies the style once for a range of HTML elements selected by class, type or relationship to others. This is much more efficient than repeating style information inline for each occurrence of the element ”

  • CSS frameworks are pre-prepared libraries that are meant to allow for easier, more standards-compliant styling of web pages using the Cascading Style Sheets language. CSS frameworks include Foundation, Blueprint, Bootstrap, Cascade Framework and Materialize


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