<video width="320" height="240">
	<source src="myvideo.mp4" type="video/mp4" />
	<source src="myvideo.ogv" type="video/ogg" />
	<source src="myvideo.webm" type="video/webm" />
	<p>Sorry, your browser cannot play this video.</p>
	<img src="videofail.png" />
</video>

http://blogs.sitepoint.com/2010/11/05/html5-video-cross-browser-fall-backs/

Until recently, playing video files in a web page was notoriously complicated. The user requires a Flash or Silverlight plug-in and even the simplest HTML is a confusing mess.

Few HTML5 features excite developers more than native audio and video. The <audio> and <video> tags allow you to play media files in an HTML5-aware browser without a plug-in. The elements also become part of the DOM so you can create your own player controls, add captions and synchronize JavaScript events with media playback. As a bonus, the basic HTML5 code is far easier to understand.

Cross-Browser HTML5 Video With Flash or Silverlight Fall-back

flash, video, html5

HTML