JavaScript makes HTML pages more dynamic and interactive.

The HTML <script> Tag

The <script> tag is used to define a client-side script (JavaScript).

The <script> element either contains scripting statements, or it points to an external script file through the srcattribute.

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.

To select an HTML element, JavaScript very often uses the document.getElementById() method.

This JavaScript example writes “Hello JavaScript!” into an HTML element with id=”demo”:

Example

<script>
document.getElementById("demo").innerHTML = "Hello JavaScript!";
</script>

Output