W3C Markup Validation Service
The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check HTML and XHTML documents for well-formed markup. Markup validation is an important step towards ensuring the technical quality of web pages; however, is not a complete measure of web standards conformance. Though W3C validation is important for browser compatibility and site usability, it has not been confirmed what effect it has on search engine optimization.
Read more about W3C Markup Validation Service: History, Browser Accommodation, Validator Criticism, CSS Validation
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“The man of large and conspicuous public service in civil life must be content without the Presidency. Still more, the availability of a popular man in a doubtful State will secure him the prize in a close contest against the first statesman of the country whose State is safe.”
—Rutherford Birchard Hayes (1822–1893)