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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.
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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
Wikipedia:User page design guide/Style; Wikipedia:Extended image syntax: advanced visual file markup. Help:A quick guide to templates: an introduction to templates. Help:Substitution: substitution is an alternative way of including templates than transclusion. Help:Score: how to render musical scores.
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The HTTP specification suggests the phrase "Not Found" [1] and many web servers by default issue an HTML page that includes both the 404 code and the "Not Found" phrase.
In September 1997, Oskoboiny began working for the W3C, and on December 18, 1997, the W3C announced its W3C HTML Validator based upon his works. [4] In November 2008, the W3C released the validator.nu HTML5 engine and the ability to check documents for conformance to HTML5.
Wikipedia:HTML 5 – information page on technical details of updating WP code to HTML 5 + CSS3, including how to replace deprecated HTML 4.01 markup; includes automated searches for obsolete markup; Wikipedia:Linter – MediaWiki extension to identify broken and problematic markup which cannot be fixed automatically by the server