Free Markup Validation Service
Because I’ve seen folks concerned about code in your page affecting Google PR. From the W3C…
The Markup Validator is a free service by W3C that helps check the validity of Web documents.
Most Web documents are written using markup languages, such as HTML or XHTML. These languages are defined by technical specifications, which usually include a machine-readable formal grammar (and vocabulary). The act of checking a document against these constraints is called validation, and this is what the Markup Validator does.
Validating Web documents is an important step which can dramatically help improving and ensuring their quality, and it can save a lot of time and money. Validation is, however, neither a full quality check, nor is it strictly equivalent to checking for conformance to the specification.
This validator can process documents written in most markup languages. Supported document types include the HTML (through HTML 4.01) and XHTML (1.0 and 1.1) family, MathML, SMIL and SVG (1.0 and 1.1, including the mobile profiles). The Markup Validator can also validate Web documents written with an SGML or XML DTD, provided they use a proper document type declaration.
HTH
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