<div id="demo" class="sample">Hello, World!</div>
<br />
<div>className property after change: <span id="span1"></span></div>
<script>
const demoElement = document.getElementById("demo");
const span1 = document.getElementById("span1");
// Changing the attribute
demo.setAttribute("class", "changed");
span1.innerHTML = demo.className;
</script>