New to html, can't get video to play in browser?

I am unable to get my video to play in browser when I click the "play" button. I would greatly appreciate the help. Thanks!

<video poster= "videoposter.jpg" width="40%" height="40%" controls= "controls">
   <source src="video/phone.mp4"  type='video/mp4'/> 
   <source src="video/phone.webm" type='video/webm; codecs"vp8, vorbis"'  />
   <source src="video/phone.ogv"  type='video/ogv; codecs="theora, vorbis"'/> 

      Your browser doesn't support the video element in HTML5.
    </video>