As Flash's ubiquity begins to erode, standards-based Web technologies are going to become the path forward for developers who want to offer a user experience that works across all screens. The HTML5 video element is already widely supported in modern Web browsers, but the capabilities and codecs that are available differ between implementations.

A new State of HTML5 Video document offers some clarity by painting a clear picture of the current status of standards-based video across the spectrum of browsers and mobile environments. The document was authored by LongTail Video, the company behind JW Player, a very popular video playback framework that supports Flash and HTML5.

Based on statistics from various browser marketshare trackers, LongTail says that two thirds of Internet users are running browsers that support HTML5. Support for standard HTML video element attributes is relatively consistent, though there are gaps: Android and iOS both lack support for the preload and autoplay attributes, for example.

Fullscreen playback and support for adaptive streaming are still highly limited. The latter will likely be remedied in the future as MPEG's DASH standard sees adoption. Codec compatibility is still a tricky issue—some browser vendors are standing behind H.264 while others favor Google's WebM.

LongTail says it will keep the document updated as the status of Web video evolves.