Use the id attribute in HTML to specify a unique id for an element in HTML.
Example
You can try to run the following code to implement the id attribute −
<html>
<body>
<h1>Tutorialspoint</h1>
<p id = "myid">We provide Tutorials!</p>
<button onclick="display()">More...</button>
<script>
function display() {
document.getElementById("myid").innerHTML = "We provide learning videos as well";
}
</script>
</body>
</html>