This specification defines a single conformance class: that which comprises user agents that support these interfaces.
The Device interface is initially defined as an empty interface on which the various device APIs that are defined elsewhere graft themselves. A user agent supporting the Device interface MUST do so according to the following WebIDL [[!WEBIDL]] definition.
The NavigatorDevice interface supplements the Navigator
interface which is defined as part of HTML 5 [[!NAVIGATOR]]. A user agent MUST expose
device attribute that implements the Device interface on the
The PendingOp interface describes objects that are returned by asynchronous methods that are cancellable. It makes it possible to bring these operations to a stop if they haven't produced a result within a desired time or before a given event, thereby possibly reclaiming resources.
The editors would like to thank (in not particular order): Anne van Kesteren, Brian LeRoux, Claes Nilsson, and Peter-Paul Koch.