The Device and Sensors Working Group invites implementation of the Candidate Recommendation of Battery Status API. The Battery Status API specification defines a means for web developers to programmatically determine the battery status of the hosting device. Without knowing the battery status of a device, a web developer must design the web application with an assumption of sufficient battery level for the task at hand. This specification defines an API that provides information about the battery status of the hosting device.

The Cascading Style Sheets (CSS) Working Group has published a Working Draft of CSS Color Module Level 4. This specification describes CSS color values and properties for foreground color and group opacity. It also describes in detail the CSS color value type and describes CSS properties which allow authors to specify the foreground color and opacity of the text content of an element. It not only defines the color-related properties and values that already exist in CSS1 and CSS2, but also defines new properties and values.

The Web Annotation Working Group has published a Candidate Recommendation for two documents:

• Web Annotation Data Model: This specification describes a structured model and format, in JSON, to enable annotations to be shared and reused across different hardware and software platforms. Common use cases can be modeled in a manner that is simple and convenient, while at the same time enabling more complex requirements, including linking arbitrary content to a particular data point or to segments of timed multimedia resources.
• Web Annotation Vocabulary: This specifies the set of RDF classes, predicates and named entities that are used by the Web Annotation Data Model. It also lists recommended terms from other ontologies that are used in the model, and provides the JSON-LD Context and profile definitions needed to use the Web Annotation JSON serialization in a Linked Data context.

Candidate Recommendation means that the Working Group considers the technical design to be complete, and is seeking implementation feedback on the documents. There is a separate document on how to use them and report on implementation results. The group is keen to get comments and implementation experiences on these specifications, either as issues on the Group’s GitHub repository or by posting to public-annotation@w3.org.

The group expects to satisfy the implementation goals (i.e., at least two, independent implementation for each of the test cases) by September 30, 2016.

The Web Platform Working Group invites implementation of the Candidate Recommendation of Pointer Lock. This specification defines an API that provides scripted access to raw mouse movement data while locking the target of mouse events to a single element and removing the cursor from view. This is an essential input mode for certain classes of applications, especially first person perspective 3D applications and 3D modeling software.

The HTML Media Extensions Working Group invites implementation of the Candidate Recommendation of two documents:

• Media Source Extensions: This specification extends HTMLMediaElement (HTML51) to allow JavaScript to generate media streams for playback. Allowing JavaScript to generate streams facilitates a variety of use cases like adaptive streaming and time shifting live streams.
• Encrypted Media Extensions: This proposal extends HTMLMediaElement (HTML5) providing APIs to control playback of encrypted content.