Do I need to add w3 to the top of the page?

Z

Zh012016-11-05 15:55:31

Search Engine Optimization

Zh01, 2016-11-05 15:55:31

Good afternoon, I
often see at the top of the pages of other people's sites <html xmlns="http://www.w3.org/1999/xhtml">
Do I need to add this line to my pages, and if necessary, what will it give?
I have this code now:

<html>
<head>
<title>Название объявления</title>
<meta HTTP-EQUIV="Pragma" CONTENT="no-cache">
<meta HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
<meta http-equiv="Content-Language" content="ru">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
<meta content="index, follow, all" name="robots">...

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1 answer(s)

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sim3x, 2016-11-05
@sim3x

https://pepelsbey.net/pres/doctype/