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No DOCTYPE Declaration Found!
According to HTML standards, each HTML document requires a document type declaration.
A DOCTYPE Declaration is mandatory [ obbligatoria ] for most current markup languages (*) and without one it is impossible to reliably [ in modo attendibile ] validate a document.
(*) Markup language: a system (as HTML or SGML) for marking or tagging a document that indicates its logical structure (as paragraphs) and gives instructions for its layout on the page especially for electronic transmission and display.
One should place a DOCTYPE declaration as the very first thing in an HTML document. For example, for a typical XHTML 1.0 document, regard this page.
Page source: http://validator.w3.org/docs/help.html#faq-doctype
For XML documents, you may also wish to include an "XML Declaration" even before the DOCTYPE Declaration, but this is not well supported in older browsers. More information about this can be found in the XHTML 1.0 Recommendation.
The W3C QA Activity maintains a List of recommended Doctypes that you can choose from, and the WDG maintains a document on "Choosing a DOCTYPE".
No Character Encoding Found! Falling back to UTF-8.