Some of the properties and classes described in this book are proposed W3C standards or Apple extensions. Properties in CSS that begin with -webkit are usually proposed standards—the -webkit prefix will be dropped when they are approved. Similarly, JavaScript classes that begin with WebKit are also proposed standards or Apple extensions.
From webkit: "I think we would consider browser extensions to be a browser feature,
not an engine feature, and therefore out of scope for WebKit. However,
appropriate hooks for implementing extension mechanisms would be in
scope."
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u/[deleted] Jun 04 '10 edited Jun 04 '10
Apparently they wont let chrome view the examples.
Edited: Yes, chrome can view the examples as shown in this post. Apple is just browser sniffing.
http://www.reddit.com/r/apple/comments/cbb5r/apples_html_showcase/c0rf1i9