What is the use of the “no-js” class in HTML ?

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Purpose:

The primary purpose of the no-js class is to allow the use of CSS to style JavaScript-free pages, i.e. defining CSS styles for JavaScript-enabled browsers as well as for JavaScript-disabled browsers.
Thus, the “no-js” class will only be present if JavaScript has been disabled. This enables styling a pure HTML and CSS page without the use of any client side-scripting.
But if JavaScript is enabled, it removes the “no-js” class automatically.
The “no-js” class is available in the markup by default.
The “no-js” class is basically a way to be able to style things with or without using JavaScript.
The “no-js” class is added to the topmost html element which serves as an instruction for Modernizr.

Syntax:

<!--[if (gt IE 9)|!(IE)]><!--> <html lang="en" class="no-js"> <!--<![endif]-->

Example:

<!DOCTYPE html> 
<html class="no-js"> 
  
<head> 
    <script>document.documentElement.className 
        = document.documentElement.className 
        .replace(/\bno-js\b/g, '') + ' js '; 
    </script> 
  
    <!-- Other files and libraries 
        to be included -->
    <head> 
  
    <body> 
        <center> 
            <h1>zambiatek</h1> 
        </center> 
    </body> 
  
</html> 