html id

The id element defines a unique id for an HTML .This HTML id value can be used with CSS and JavaScript to perform certain task. In CSS, to select an element with a specific id, write hash (#) character followed by the id of the element.

HTML Id Example

<html>
<head>
<style>
#paragraph {
    background-color: lightblue;
    color: black;
    text-align: center;
} 
</style>
</head>
<body>

<p id="paragraph">welcome to javameant</p>

</body>
</html>

HTML Id in Javascript

<!DOCTYPE html>
<html>
<body>



<h1 id="myid">welcome to javameant</h1>
<button onclick="result()">Change text</button>

<script>
function result() {
    document.getElementById("myid").innerHTML = "see you soon";
}
</script>

</body>
</html>