How is SoundCloud embedding an HTML5/JS widget on Facebook?

Question

Here\'s the scenario I\'m seeing -

• You click to post a sound from SoundCloud to Facebook
• It embeds a player in the post that can either be clicked on

Answer 1

This may only be a partial answer. But there exists a special Facebook Open Graph Music program which "is only available to whitelisted partners at this time". This includes a bridge which has the goal to "enable play buttons on feed stories on Facebook.com that can play and pause tracks and indicate which is playing."

However, apparently you can include both Flash (application/x-shockwave-flash) and HTML5 video (video/mp4) formats in the og:video:type property.