转载自smashingmagazine的一篇文章：CSS2.1和CSS3帮助文档（PDF 格式）。这两个文档可以帮助你快速查看正确的CSS2.1属性或者还不太为人所知的CSS3属性。其中的样式表包含最重要的属性、解释以及每一个属性的关键字。文档是由GoSquared建立，并通过smashing magazine进行发布的。
以下是来自编者设计之前的话：

“We created the original CSS Help Sheet because we spent ages staring at ugly cheat sheets while designing beautiful sites. So we thought we’d make a Help Sheet that didn’t hurt the eyes of anyone who tried to use it. The past year, we’ve found ourselves using more and more CSS3 methods, and there was never much in the way of help out there until we decided to create a Help Sheet specifically for CSS3.

We’ve kept CSS2 and CSS3 on separate Help Sheets for now as not everything in CSS3 is finalised, or works in all browsers (cough, IE).

We hope you enjoy using them, and that they help you create even more memorable, usable, and stylish websites.

Thank you, guys. We really appreciate your work and your good intentions.（谢谢各位，我们真的非常感谢你们的工作和良好的意愿。）
* CSS 2.1 文档（大图预览）
* CSS 3 文档（大图预览）
* 下载CSS 2.1文档（PDF格式）（0.2mb）
* 下载CSS 3文档（PDF格式）（已更新，0.2mb）
* 设计者发布帮助文档日志