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How to check the html version that any web application uses?

How can I check which version of html my web application is using? I have a complete codebase, but I'm not sure where to check the html version? In jsp I don't see anything related to the html version.

EDIT: - On Google. most of the material says that the source of the page, the very first line tells the html version. When I do the same isee

<!doctype html>

Now I'm not sure which version of html will be displayed from the above line?

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Check the DOCTYPE declaration in the html file.

HTML5

 <!DOCTYPE html>

HTML 4.01 Strict

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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Source: https://habr.com/ru/post/919517/

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