The Position.coords read-only property, a Coordinates object, represents a geographic attitude: it contains the location, that is longitude and latitude on the Earth, the altitude, and the speed of the object concerned, regrouped inside the returned value. It also contains accuracy information about these values.
The Position.timestamp read-only property, a DOMTimeStamp object, represents the date and the time of the creation of the Position object it belongs to. The precision is to the millisecond.
The PositionError.code read-only property is an unsigned short representing the error code. The following values are possible:
The PositionError.message read-only property returns a human-readable DOMString describing the details of the error.
The PositionOptions interface describes an object containing option properties to pass as a parameter of Geolocation.getCurrentPosition() and Geolocation.watchPosition().
URL
The URL interface represent an object providing static methods used for creating object URLs.
WebRTC (Web Real-Time Communications) is a technology which enables Web applications and sites to capture and optionally stream audio and/or video media, as well as to exchange arbitrary data between browsers without requiring an intermediary. The set of standards that comprises WebRTC makes it possible to share data and perform teleconferencing peer-to-peer, without requiring that the user install plug-ins or any other third-party software.
The BatteryManager interface provides ways to get information about the system's battery charge level.
In the File System API, a FileException object represents error conditions that you might encounter while accessing the file system using the synchronous API. It extends the FileException interface described in File Writer and adds several new error codes.
In the File System API, a FileSystemSync object represents a file system. It has two properties.
The LocalFileSystem interface of the File System API gives you access to a sandboxed file system.  The methods are implemented by window and worker objects.
The LocalFileSystemSync interface of the File System API gives you access to a sandboxed file system. It is intended to be used with WebWorkers. The methods are implemented by worker objects.
The getBattery() method provides information about the system's battery, returns a battery promise, which is resolved in a BatteryManager object providing also some new events you can handle to monitor the battery status.. This implements the Battery Status API; see that documentation for additional details, a guide to using the API, and sample code.
The AnalyserNode interface represents a node able to provide real-time frequency and time-domain analysis information. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations.
An AudioContext can be a target of events, therefore it implements the EventTarget interface.
AudioDestinationNode has no output (as it is the output, no more AudioNode can be linked after it in the audio graph) and one input. The amount of channels in the input must be between 0 and the maxChannelCount value or an exception is raised.
There are two kinds of AudioParam, a-rate and k-rate parameters: