HTML5 provides native support for playing video in the browser without plugins. However, browser support for different video formats is inconsistent, with H.264, Ogg, and WebM being the main cross-platform options. While the technology is maturing, video backends still need to support multiple formats to ensure compatibility across browsers. HTML5 video is establishing itself, but proprietary formats have not been fully replaced yet. Developers should be prepared to implement HTML5 video with Flash fallback for now.