The best/proper way to declare that your page uses the html5 protocol is <DOCTYPE HTML>
It should be noted that HTML5 is a markup language that is used for structuring band presenting content on the world wide web.
In this case, the best/proper way to declare that your page uses the html5 protocol is <DOCTYPE HTML>.
Learn more about HTML on:
brainly.com/question/4056554
#SPJ12