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Are the sites running a valid HTML, XHTML and CSS code, validated by the World Wide Web Consortium?

April 26, 2017code consortium CSS html running sites valid validated world wide web XHTML

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Are the sites running a valid HTML, XHTML and CSS code, validated by the World Wide Web Consortium?

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Yes, usually the code is a valid XHTML and CSS code. Depending on how complex it is and what functionality the site or the web application has. The valid code only applies for the sites until they are maintained by third parties or by the client, as we can’t control the way users add content on their site.