snydeq writes "InfoWorld's Neil McAllister takes a deeper look at HTML5, outlining what developers should expect from this overhaul of HTML — one that some believe could put an end to proprietary Web technologies such as Flash and Silverlight. Among the most eagerly anticipated additions to HTML5 are new elements and APIs that allow content authors to create rich media using nothing more than standards-based HTML. The standard also introduces browser-based application caches, which enable Web apps to store information on the client device. 'But for all of HTML5's new features, users shouldn't expect plug-ins to disappear overnight. The Web has a long history of many competing technologies and media formats, and the inertia of that legacy will be difficult to overcome. It may yet be many years before a pure-HTML5 browser will be able to match the capabilities of today's patchwork clients,' McAllister writes. 'In the end, browser market share may be the most significant hurdle for developers interested in making the most of HTML5. Until these legacy browsers are replaced with modern updates, Web developers may be stuck maintaining two versions of their sites: a rich version for HTML5-enabled users, and a version for legacy browsers that falls back on outdated rendering tricks.'"