W3C

Page Visibility (Second Edition) is a W3C Recommendation, Beacon and Resource Priorities First Public Working Drafts

The Web Performance Working Group has published a W3C Recommendation and two First Public Working Drafts today:

  • A W3C Recommendation of Page Visibility (Second Edition). This specification defines a means for site developers to programmatically determine the current visibility state of the page in order to develop power and CPU efficient web applications.
  • A First Public Working Draft of Beacon. This specification defines an interoperable means for site developers to asynchronously transfer data from the user agent to a web server, with the user agent taking the responsibility to eventually send the data.
  • A First Public Working Draft of Resource Priorities. This specification defines a means for site developers to programmatically give the User Agent hints on the download priority of a resource. This will allow User Agents to more efficiently manage the order in which resources are downloaded.

Learn more about the Rich Web Client Activity.