This is [[http://www.openwebosproject.org/|open source]] but copyright still shows an HP entity owning it. 

 * [[http://www.openwebosproject.org/docs#.UOXF2-Oe_2p|Developer documentation]] from Open WebOS

These documents are probably going to disappear someday, in favor of links on the Open WebOS site, but are not replicated there now. 
 * [[https://developer.palm.com/content/api/design/mojo/user-interface-summary.html|User Interface Summary]]
 * [[https://developer.palm.com/content/api/design/mojo/hi-guidelines.html|Human Interface Guidelines]]