Sixty-six years ago today (on 1947-09-09) operators of the Mark II Aiken Relay Computer being tested at Harvard found a dead moth trapped between points of Relay #70 in Panel F. Dr. Grace Hopper made an entry in the Mark II log book and identified it as the "first actual case of bug being found". (source)

The log book is now at the National Museum of American History.

The RDF Working Group and the JSON-LD Community Grouppublished the Candidate Recommendation of JSON-LD 1.0, and JSON-LD 1.0 Processing Algorithms and API. This signals the beginning of the call for implementations for JSON-LD 1.0.

JSON-LD harmonizes the representation of Linked Data in JSON by describing a common JSON representation format for expressing directed graphs; mixing both Linked Data and non-Linked Data in a single document. The syntax is designed to not disturb already deployed systems running on JSON, but provide a smooth upgrade path from JSON to JSON-LD. It is primarily intended to be a way to use Linked Data in Web-based programming environments, to build interoperable Linked Data Web services, and to store Linked Data in JSON-based storage engines.

The JSON-LD 1.0 specification describes the JSON-LD language in a way that is useful to authors. It also provides the core grammar of the language for implementers. The JSON-LD 1.0 Algorithms and API specification describes useful Algorithms for working with JSON-LD data. It also specifies an Application Programming Interface that can be used to transform JSON-LD documents in order to make them easier to work with in programming environments like JavaScript, Python, and Ruby.

Learn more about the Semantic Web Activity.

The Authoring Tool Accessibility Guidelines Working Group has published an updated Last Call Working Draft of Authoring Tool Accessibility Guidelines (ATAG) 2.0 and a Working Draft of the Note Implementing ATAG 2.0. The updates, which include 3 substantive changes, are based on public comments and clarifications identified while developing tests for ATAG. These updates are available for review and comment through 1 October 2013. Learn more from the ATAG Overview and about the Web Accessibility Initiative (WAI).

The Internationalization Working Group has published a Last Call Working Draft of Use Cases & Exploratory Approaches for Ruby Markup. This document aims to support discussion about what is needed in the HTML5 specification, and possibly other markup vocabularies, to adequately support ruby markup. It looks at a number of use cases involving ruby, and how well the following approaches support those use cases: the HTML5 model described in the Candidate Recommendation as of 17 December 2012, the XHTML Ruby Annotation model, and the Ruby Extension Specification proposed in February 2013. Comments are welcome through 24 September. Learn more about the Internationalization Activity.

The HTML Working Group has published a Working Draft of HTML to Platform Accessibility APIs Implementation Guide. This is draft documentation mapping HTML elements and attributes to accessibility API Roles, States and Properties on a variety of platforms. It provides recommendations on deriving the accessible names and descriptions for HTML elements. It also provides accessible feature implementation examples. Learn more about the HTML Activity.

The Web Real-Time Communications Working Group has published a Working Draft of WebRTC 1.0: Real-time Communication Between Browsers. This document defines a set of ECMAScript APIs in WebIDL to allow media to be sent to and received from another browser or device implementing the appropriate set of real-time protocols. This specification is being developed in conjunction with a protocol specification developed by the IETF RTCWEB group and an API specification to get access to local media devices developed by the Media Capture Task Force. Learn more about the Ubiquitous Web Applications Activity.

The Cascading Style Sheets (CSS) Working Group has published a Working Draft of CSS Grid Layout Module Level 1. This CSS module defines a two-dimensional grid-based layout system, optimized for user interface design. In the grid layout model, the children of a grid container can be positioned into arbitrary slots in a flexible or fixed predefined layout grid. CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc. Learn more about the Style Activity.