Release Notes: Support for XHTML Mobile Profile and XHTML+RDFa was added. A --header='Name: value' command-line option for specifying HTTP headers was added.
Release Notes: This version adds support for "XHTML 1.1 plus MathML 2.0 plus SVG 1.1" from MathML 2.0 Second Edition.
Release Notes: This version fixes a bug where single quotes weren't accepted around the DOCTYPE's formal public identifier.
Release Notes: This version added warnings for valid but unsafe HTML, support for Perl's taint mode, better portability with file paths, and auto-detection of Emacs modes.
Release Notes: This version fixes a bug that caused extra requests and occasional failures when validating a URI.
Release Notes: This version fixes a bug that caused the wrong character encoding to be used when checking multiple documents with different character encodings.
Release Notes: This release adds support for proxies when validating remote documents.
Release Notes: This version adds support for validation of URIs and support for XHTML 1.1, MathML 2.0, and WML 1.0 through 1.3.
Release Notes: This release fixes a bug that prevented validation of files whose names contained whitespace or shell metacharacters.
Release Notes: This release adds an --emacs option to give output intended for parsing by Emacs, and it also reports errors for references to non-existent IDs in attributes such as the "headers" attribute of the "td" element.