Only text Slider

HTML file

<h1 id="changingtext">We Are  <span>Digital </span>Marketing.</h1>

script.js

<script>
var text = [ 'We Are <span>Social Media.</span>','We Are<span> Web</span> Design.','We Are <span>Mobile</span> Development.','We Are<span> Joker</span> Media.','We Are <span> Digital </span>Marketing.']; 
var counter = 0;
var elem =document.getElementById('changingtext');
var f = setInterval(change, 3000);

function change() {
  elem.innerHTML = text[counter];
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</script>