I first got to know Kim Patch when we worked together on the W3C User Agent Accessibility Working Group. As a resident of the Web since it’s inception and a long term voice input / non mouse user I was always fascinated to hear what she had to say about making web content, and how a browser interprets that content, accessible.
This document contains author conformance requirements for use of the alt attribute in HTML5 and best practice guidance for authors of HTML documents on providing text alternatives for images.
This specification is an extension to the HTML5 specification [HTML5]. All normative content in the HTML5 specification, unless specifically overridden by this specification, is intended to be the basis for this specification.