CSS3 can achieve effects and even animation effects that previously required the use of images and scripts with just a few lines of code, such as rounded corners, image borders, shadows, gradients, animations, etc. CSS3 makes code simpler and more efficient, simplifies the design process of front-end developers, speeds up page loading, and creates a more advanced user experience.
The operating environment of this tutorial: Windows 7 system, CSS3 version, Dell G3 computer.
CSS3 is an upgraded version of CSS2, 3 is just the version number. It adds many powerful new features on the basis of CSS2.1. Currently, the main browsers Chrome, Safari, Firefox, Opera, and even 360 have Most of the functions of CSS3 are supported, and IE10 will also fully support CSS3 after IE10.
When writing CSS3 styles, different browsers may require different prefixes. It means that this CSS property or rule is not yet part of the W3C standard. It is a private attribute of the browser. Although newer versions of browsers do not require prefixes, prefixes are still indispensable for better forward compatibility.
Chrome and Safari: -webkit
Firefox: -moz
IE: -ms
Opera：-o
CSS3 takes only a short time to achieve many effects and even animation effects that previously required the use of images and scripts. It can be done with just a few lines of code. For example: rounded corners, picture borders, text shadows and box shadows, gradients, personalized fonts, multiple picture backgrounds, deformation processing (rotation, scaling, tilting, movement), transitions, animations, multi-column layouts, media queries, etc.
CSS3 simplifies the design process for front-end developers and speeds up page loading.
There are also selectors. In the past, we usually used class, ID or tagname to select HTML elements. CSS3 selectors are incredibly powerful. They can reduce the number of classes and IDs in tags, make it easier to maintain style sheets, and better achieve the separation of structure and presentation.
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