html lang tab
snippet in html

html5 language code

user8632

<html lang="en">
	<!-- ... -->
</html>

html lang attribute

user4631

The HTML lang attribute is used to identify the language of text content on the web. This information helps search engines return language specific results, and it is also used by screen readers that switch language profiles to provide the correct accent and pronunciation

Syntax
<element lang="language_code">
  
Example
Some French text in a paragraph:

<p lang="fr">Ceci est un paragraphe.</p>

html lang tab

user7120

It basically tells the search engine about the language of the content of the web page.