From the Safari update message:

Improved HTML5 support: Safari supports over a dozen new HTML5 features, 
including Geolocation, full screen for HTML5 video, closed captions for 
HTML5 video, new sectioning elements (article, aside, footer, header, 
hgroup, nav and section), HTML5 AJAX History, EventSource, WebSocket, 
HTML5 draggable attribute, HTML5 forms validation,

and HTML5 Ruby.
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So where's the squeak?