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Warning The list is informative and does not try to be exhaustive (there are many other proper declarations you could use), but it has most of the declarations commonly used on the Web at the moment. Recommended Doctype Declarations to use in your Web document.
Add elements to the set of matched elements. Add the previous set of elements on the stack to the current set, optionally filtered by a selector. Adds the specified class(es) to each of the set of matched elements.