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DOCTYPE html

<! DOCTYPE html>

It is a declaration that instructs browser about what version of HTML is used in creating the web-page.
Though it is not mandatory to write it in the html document but it is a good practice to include it. suppose we have not specified html version then the browser will itself assume a version, now it may happen that we have created a web-page using html-5 and someone is accessing it using an older browser which works on html-4 then some of our tags will not be rendered leading to some errors.

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