This proof of concept HTML5 Guitar Tab Player was created with the Firefox 4 Audio Data API and Vexflow. It reads MusicXML files and dynamically generates tab and audio. Created with JavaScript.
Read more here: http://www.gregjopa.com/2010/12/html5-guitar-tab-player-with-firefox-audio-data-api/
and here:
http://hacks.mozilla.org/2011/01/html5guitar/
github link: https://github.com/gregjopa/HTML5-Guitar-Tab-Player