12. The system of claim 11 , wherein the process further comprises: identifying a media-dependent style rule encoded in the set of presentation semantics associated with the structured document; determining that the display requirement of the second type of media device satisfies the media-dependent style rule; and in response to the determination, deleting the media-dependent style rule from the set of presentation semantics and preserving the corresponding style property; wherein the style property corresponds to the satisfied media-dependent style rule.
12. The system of claim 11 , wherein the process further comprises: identifying a media-dependent style rule encoded in the set of presentation semantics associated with the structured document; determining that the display requirement of the second type of media device satisfies the media-dependent style rule; and in response to the determination, deleting the media-dependent style rule from the set of presentation semantics and preserving the corresponding style property; wherein the style property corresponds to the satisfied media-dependent style rule. 14. The system of claim 12 , wherein the display requirement of the second type of media device includes at least one feature selected from a group consisting of: a maximum width of a rendering surface of the second type of media device, a maximum display resolution of the second type of media device, and a display orientation of the second type of media device.