You can edit / change the code and click run button <!-- Simple audio playback --> <audio src="http://developer.mozilla.org/api/deki/files/2926/=AudioTest_(1).ogg" autoplay> Your browser does not support the <code>audio</code> element. </audio> <!-- Audio playback with captions --> <audio src="foo.ogg"> <track kind="captions" src="foo.en.vtt" srclang="en" label="English"> <track kind="captions" src="foo.sv.vtt" srclang="sv" label="Svenska"> </track></track></audio> <p>Please wait for a minute you will hear the audio form Mozilla Firefox website</p>