W3C News

Call for Review: HTML5 Image Description Extension (longdesc) Proposed Recommendation

The HTML Working Group, with the approval of the Protocols and Formats Working Group, has published a Proposed Recommendation of HTML5 Image Description Extension (longdesc). This extension for HTML5 adds a longdesc attribute that is used to provide links to detailed descriptions of images. Comments are welcome through 16 January. Learn more about the HTML Accessibility Task Force which is a joint task force of the two Working Groups.

Task Scheduler API Specification; TCP and UDP Socket API Working Drafts Updated

The System Applications Working Group published two documents today:

  • A Working Draft of Task Scheduler API Specification. This specification defines an API to schedule a task at a specified time. When the indicated time is reached, the application that scheduled the task will be notified via a functional event on a service worker. A task event will be delivered to a service worker, regardless of whether the application is active on user agent. Applications such as an alarm clock or an auto-updater may utilize this API to perform certain action at a specified time.
  • A Working Draft of TCP and UDP Socket API. This API provides interfaces to raw UDP sockets, TCP Client sockets and TCP Server sockets.

Learn more about the Ubiquitous Web Applications Activity.

Filter Effects Module Level 1 Draft Published

The CSS Working Group and the SVG Working Group have published a Working Draft of Filter Effects Module Level 1. Filter effects are a way of processing an element’s rendering before it is displayed in the document. Typically, rendering an element via CSS or SVG can conceptually be described as if the element, including its children, are drawn into a buffer (such as a raster image) and then that buffer is composited into the elements parent. Filters apply an effect before the compositing stage. Examples of such effects are blurring, changing color intensity and warping the image. Although originally designed for use in SVG, filter effects are a set of operations to apply on an image buffer and therefore can be applied to nearly any presentational environment, including CSS. They are triggered by a style instruction (the filter property). This specification describes filters in a manner that allows them to be used in content styled by CSS, such as HTML and SVG. It also defines a CSS property value function that produces a CSS value. Learn more about the Style Activity and the Graphics Activity.