This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.
:fullscreen, that is without a dash, but both the Webkit and Gecko experimental implementations use a prefixed variant with two words linked by a dash:
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari|
|Basic support||15.0 -webkit (see notes)||9.0 (9.0)-moz (see notes)||11 -ms||Not supported||6.0 -webkit (see notes)|
|Feature||Android||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|Basic support||?||9.0 (9.0)||Not supported||Not supported||Not supported|
Both the Webkit and Gecko prefixed versions have a dash between full and screen, but he W3C proposal use one single word: