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.
Advanced lossy compression for PNG images that preserves full alpha transparency.
Images make web pages interesting. So let’s make them useful for everyone, not just those that can see them.
The same image may require a different text alternative when it plays a different role or is used in a different context.