how to declare doctype in html code example

Example 1: html doctype declaration

<!DOCTYPE html>
<!--Use the html tag too, under the declaration. -->

Example 2: doctype html

<!DOCTYPE html>
This tag shows that it is running HTML5

Example 3: doctype html

<!DOCTYPE html>
it lets the browser know about the version of HTML you
are using.but it is not nessesary 
since your browser will render it anyways

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