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CSS3 - Cascading Style Sheets Level 3

Cascading Style Sheets level 3 is the most recent iteration of CSS. In it, CSS will be modularized to clarify the connections between the different parts of the specification as well as to make it more streamlined.
How Do you Stretch a Background Image in a Web Page
Stretching a background image seems like something that would be fairly easy to do, but until CSS 3 properties are more widely supported, we have to use a workaround.
CSS 3 Opacity
Opacity is a method of making elements transparent in CSS 3. It is not supported in all browsers, but there are ways to get around it in the browsers that don't support it.
CSS 3 Selectors That Work Right Now
CSS 3 is not yet complete, but there are some selectors already available that you can use to help improve your documents destined for a Mozilla/Firefox audience. CSS 3 selectors give you a lot more flexibility and power with your Web documents.
What is CSS3?
CSS 3 is the modularization of Cascading Style Sheets to allow additions to the specification as well as limit the properties used in a given situation. With a specification that is modular, additions and changes to that specification become much easier.
Introduction to CSS3
CSS 3 is still a working draft specification, and the best place to get information about it is from the CSS 3 working group's drafts. This introduction to CSS 3 explains what the plans are for this version as well as what will be included.
CSS3 Preview - CSS3.info
See some of the new effects in CSS3 as they are implemented into browsers.
CSS 3 Selectors
While CSS 3 is still in production, you can review the selectors that are already in use in CSS 2 and CSS 1, as well as the proposed selectors for CSS 3.
CSS3 Modules - CSS3 . info
CSS3.info is maintaining a list of the CSS3 modules and their status in the recommendation process. There is also a browser compatibility column, although almost none of the modules have anything there.

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