Have you ever wondered why some html tags are either written in all uppercase, while some are lowercase?
This is because html itself is not a case sensitive language. The thing that validates whether a html code is valid or not-- called DTD or document type declaration decides which case is valid or not. XML which is another mark up language is sometimes used to write html. If that is the case, you need to write in all lowercase since xml requires all the tags to be lowercase
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