Arquivo.pt - The Portuguese web-archive (PWA) is the national Web archive of Portugal. Its mission is to periodically archive contents of national interest available on the Web, storing and preserving for future generations information of historical relevance. It is a service of the Foundation for Science and Technology (FCT).
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20090711000400/http://www.htmlhelp.com/reference/css/references.html
CSS 2.1 corrects a few errors in CSS2, while removing some CSS2 features (most with poor browser support) and adding other features (most with good browser support and strong demand). CSS 2.1 is intended to replace CSS2, and represents a "snapshot" of CSS features that were implemented interoperably when it was published.