1<body>
2
3<p class="demo">JavaScript can change the content of an HTML element.</p>
4<p class="demo">Yolo</p>
5
6<button type="button" onclick="myFunction()">Click Me!</button>
7
8<script>
9function myFunction()
10{
11x=document.getElementsByClassName("demo"); // Find the elements
12 for(var i = 0; i < x.length; i++){
13 x[i].innerText="Hello JavaScript!"; // Change the content
14 }
15
16}
17
18</script>
19</body>