W3C ?r? th? main ?t?nd?rd? body f?r th? w?b, ?nd h?v? d?f?n?d a ?r????? ?????f???t??n f?r h?w th? HTML (?r XHTML) ?f a w?b??t? ?h?uld b? written. This ?? t? ensure ??m??t?b?l?t?, ???????b?l?t?, and f?ll?w b??t practice. W3C ??m?l??n?? ?? th?r?f?r?…