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1) HTML VALIDATION (20 points): For an HTML document to be valid, we have to check the following: The first tag overall is of the form he document is required to contain a valid html tag. (const For this part, you will complete the definition of bool document) where: html_is_valid std::string& The string document contains the entire contents of a file to validate Return true if the document contains valid html code as described above. Return false if any of the rules/specifications were violated