JSFiddle - React, Tailwind, and code Playground

HTML

<p id="result-0" ></p>
<p id="result-1" ></p>
<p id="result-2" ></p>
<p id="result-3" ></p>
<p id="result-4" ></p>
<p id="result-5" ></p>
<p id="result-6" ></p>
<p id="result-7" ></p>
<p id="result-8" ></p>
<p id="result-9" ></p>

JavaScript

// check body tagname, return bool
var check = (function ()
{
	var body = /body/gi;
	
	return function ( str )
	{
			
		return body.test( str );
	}
	
})();

// get body element
var body = document.body;

// display result
for ( var i = 0; i < 10; i++ )
{
	document.getElementById( 'result-' + i ).innerHTML = check( body.tagName );
}