The Web Performance Working Group has published a Last Call Working Draft of Beacon. This specification defines an interoperable means for site developers to asynchronously transfer small HTTP data from the User Agent to a web server. Comments are welcome through 29 July 2014.
The group also updated the Candidate Recommendation of Resource Timing. This specification defines an interface for web applications to access the complete timing information for resources in a document.
Learn more about the Rich Web Client Activity.