JSFiddle - React, Tailwind, and code Playground

HTML

<p>Lorem Ipsum</p>
<p class="middle">Lorem Ipsum</p>
<p class="middle">Lorem Ipsum</p>
<p>Lorem Ipsum</p>

JavaScript

function filter(selElementos, selFiltro) {
	var els = document.querySelectorAll(selElementos);
	var filtro = document.querySelectorAll(selFiltro);
	var saida = [];
	for(var i=0; i<els.length; i++) {
		for(var j=0; j<filtro.length; j++) {
			if(els[i] == filtro[j]) {
				saida.push(els[i]);
			}
		}

	}
	return saida;
}

console.log(filter('p', '.middle'));