- HTML Tidy Project Page - HTML Tidy is an open source program and library for checking and generating clean XHTML/HTML. Binaries and source for a variety of platforms are available for download.
-- https://tidy.sourceforge.net/ - W3C HTML Validation Service - The W3C Validation Service validates multiple versions of XHTML and HTML, outputting many useful errors and warnings to help users create a standards-compliant web page. Friendly, easy-to-use interface to an HTML validation service, based on a real SGML parser.
-- https://validator.w3.org - Dave Raggett HTML TIDY - Overview of the markup correction tool by Dave Raggett.
-- https://www.w3.org/People/Raggett/tidy |