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The first version of CSS HTML Validator was released in 1997 for Windows 95. The current version is 2025/v25.01 [2] (as of January 24, 2025) and is for Windows 10 and above, including Windows 11. A native macOS and Linux command line version (called htmlval) became available with version 23. There are currently three main editions of CSS HTML ...
The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.
XHTML 1.0 Transitional is the XML equivalent of HTML 4.01 Transitional, and includes the presentational elements (such as center, font and strike) excluded from the strict version. XHTML 1.0 Frameset is the XML equivalent of HTML 4.01 Frameset, and allows for the definition of frameset documents—a common Web feature in the late 1990s.
The current recommendation is RDFa+XHTML version 1.1, which became a W3C Recommendation on 7 June 2012 [3] and was updated with a ”Second Edition” on 22 August 2013 [4] and a ”Third Edition” on 17 March 2015. [5] Version 1.1 is based on XHTML™ 1.1 - Module-based XHTML - Second Edition. Version 1.0 was based on the first edition.
RDFa was defined in 2008 with the "RDFa in XHTML: Syntax and Processing" Recommendation. [16] Its first application was to be a module of XHTML.. The HTML applications remained, "a collection of attributes and processing rules for extending XHTML to support RDF" expanded to HTML5, are now expressed in a specialized standard, the "HTML+RDFa" (the last is "HTML+RDFa 1.1 - Support for RDFa in ...
XMLHttpRequest data is subject to this security policy, but sometimes web developers want to intentionally circumvent its restrictions. This is sometimes due to the legitimate use of subdomains as, for example, making an XMLHttpRequest from a page created by foo.example.com for information from bar.example.com will normally fail.
This section gives examples of diagnostics generated by the markup validation service, and suggests possible fixes. Diagnostics are by line and column of the generated HTML for the page. It may be helpful to obtain the HTML in order to understand the diagnostic. For example, if you using the Firefox browser, you can type control-U to see the HTML.
Flying Saucer (also called XHTML renderer) is a pure Java library for rendering XML, XHTML, and CSS 2.1 content. It is intended for embedding web-based user interfaces into Java applications, but cannot be used as a general purpose web browser since it does not support HTML .