document.getELementById, w3schools.com code example
Example 1: how to use document.getelementbyid
<p id="YourId">How to use document.GetElementById in HTML</p>
<script>
document.GetElementById('YourId')..innerHTML('/* what will it change... */')
</script>
Example 2: how to use document.getelementbyid
<p id="YourId">How to use document.GetElementById in HTML</p>
<script>
function demo(){
document.GetElementById('YourId')..innerHTML('/* what will it change... */')
}
</script>
<!-- Now execute it by writing the button tag!--><button onclick="demo()">Click Me!!!</button>