x
<html><body><h1>The DOMTokenList Object</h1><h2>The length Property</h2><p>The number of class tokens in "demo" are:</p><p id="demo" class="c1 c2 c3"></p><script>const list = document.getElementById("demo").classList;let number = list.length;document.getElementById("demo").innerHTML = number;</script></body></html>