HTML5 - Information and samples for HTML5 and related APIs

Test pages

Feature	Web browser support
Canvas	9.0+ 3.0+ 3.0+ 1.0+ 9.5+
Custom data attributes	all all all all all
Custom data attributes - dataset property	(none) 7.0 9.0 5.1 11.10
File API	(none) 3.6+ 4.0+ (partial support) 5.0+ 11.50
File API for choosing, uploading, previewing and seeing progress for multiple files	(none) 3.6+ 4.0+ (partial support) 5.0+ 11.50 (partial support)
Geolocation	9.0+ 3,5+ (iPhone) 5.0+ 10.6+
History API	(none) 4.0+ 5.0+ 5.0+ 11.50
localStorage	8.0+ 2.0+ 4.0+ 2.0+ 10.5+
sessionStorage	8.0+ 3.5+ 4.0+ 2.0+ 10.5+
Offline Web Applications	(none) 3.5+ 4.0+ 1.0+ 10.6+
Online/Offline events	8.0+ 3.5+ 13+ 5.1+ 9.5+
Online polling	8.0+ 3.5+ 4.0+ 5.0+ 10.0+
postMessage	8.0+ 3.0+ 4.0+ 1.0+ 9.5+
SVG: - Inline as application/xhtml+xml or text/xml - Included as file via embed, object or iframe elements - Via JavaScript	9.0+ 3.0+ 3.0+ 1.0+ 9.5+
SVG: - Inline in regular HTML documents (text/html)	9.0+ 4.0+ 5.x+ 7.0+ (none)
Video	9.0+ 3.5+ 4.0+ 1.0+ 10.5+ Notable here is that the main concern is codecs. Firefox and Opera support Ogg Theora and WebM, IE and Safari support H.264 and Google Chrome supports all three formats.
Web Workers	(none) 3.5+ 4.0+ 5.0+ 10.6+