HTML5_video

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http://www.w3schools.com/html/tryit.asp?filename=tryhtml5_video_js_prop

<!DOCTYPE html> <html> <body> <div style="text-align:center">   <button onclick="playPause()">Play/Pause</button>   <button onclick="makeBig()">Big</button>  <button onclick="makeSmall()">Small</button>  <button onclick="makeNormal()">Normal</button>  <br>   <video id="video1" width="420" controls>    <source src="mov_bbb.mp4" type="video/mp4">    <source src="mov_bbb.ogg" type="video/ogg">    Your browser does not support HTML5 video.  </video></div> <script> var myVideo=document.getElementById("video1"); function playPause(){ if (myVideo.paused)   myVideo.play(); else   myVideo.pause(); } function makeBig(){ myVideo.width=560; } function makeSmall(){ myVideo.width=320; } function makeNormal(){ myVideo.width=420; } </script> <p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p></body> </html>

BrowserMP4WebMOggInternet ExplorerYESNONOChromeYESYESYESFirefoxNO
Update: Firefox 21 running on Windows 7, Windows 8, Windows Vista, and Android now supports MP4YESYESSafariYESNONOOperaNOYESYES