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HTML Doctype

Overview

  • To write Doctype is not necessary to render HTML Pages.
  • It is only a metadata to inform browser what version of HTML is being followed.
  • It sits to the top of HTML page, even outside <html> tags.

Use of HTML Doctype

However it is not compulsory to add the doctype to your web pages but while making professional websites it helps in rendering the web pages depending on the doctype declaration that you have mentioned on the top of the web page.

<!doctype html>

Doctype declaration helps the browser (eg: chrome or firefox) to understand what version of html are you using for your web pages, and what protocols are to be followed to render these web pages correctly.

VersionYear
HTML 4.01<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
XHTML<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
HTML5<!DOCTYPE html>
Further Reading

1. Doctype

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