Adding language class to code tags as recommended by HTML5 specs #48
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Specifications by W3C recommend to add a class to the code tag to indicate the language being used. Several code highlighting libraries, such as Prism or highlight.js, use this declaration to determine which language is being used.
Specifications can be found here: http://www.w3.org/TR/html5/text-level-semantics.html#the-code-element