Understand the basic information of css

css version

Brief history of css

The version of css 1 was published by Hakon Wium Lie and Bert Bos in 1996. It is relatively simple and only 68 pages printed on A4 paper.
The version of css 2 was published in 1998. At this time, two editors, Chris Lilley and Lan Jacobs, were added. Its specification became complicated, and its length exploded to 480 pages of printing paper.
After css2, the css working group has realized that this language has become so powerful that it cannot be packed into a single specification, so it is divided into different modules, and each module can be updated independently.

The css module is upgraded to version 3

• css syntax
• css cascade and inheritance
• css color
• Selector
• css background and border
• css value and unit
• css typesetting
• css text decoration effect
• css font
• css basic UI features

If a module is a new concept, its version number starts from 1

• css deformation
• Image blending effect
• Filter effect
• css mask
• css telescopic box layout
• css grid layout

What does css3 contain?

We can understand that css3 includes the third edition of the specification and the first edition of some new specifications.

Browser prefix

Common browser prefixes that everyone knows

Firefox-moz-
IE-ms-
Opera- o-
Safari and Chrome-webkit-

css compatibility in the browser

You can add the prefixes of all possible browsers, and write no prefix at the end. Of course, sometimes some declarations are redundant, such as -ms-border-radius, -o-border-radius generally will not appear, because at the beginning IE and Opera have implemented border-radius

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