HTML <script> id Attribute

The id attribute on a <script> tag assigns an identifier to the script element. The identifier must be unique across the page.



An id attribute on a <script> element.

<script id="myscript" src="/tutorial/script-example.js">

Using id

The id attribute assigns an identifier to the <script> element.

The identifier must be unique across the page.

The id allows programmatic access to the <script> element.

Tip:  id is a global attribute that can be applied to any HTML element.


<script id="identifier" />



Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

A <script> tag with a unique id.
Clicking the button displays the name of the JavaScript source file.

<script id="myscript" src="myscript.js">
<button onclick="show();">Show script src</button>

  let show = () => {
    let element = document.getElementById("myscript");
    alert("Src = " + element.src);

Code explanation

The id attribute assigns a unique identifier for the <script>.

Clicking the button calls JavaScript that locates the <script> through the id.

It extracts the <script> source stored in the src attribute and displays it in an alert box.

Browser support

Here is when id support started for each browser:

1.0 Sep 2008
1.0 Sep 2002
1.0 Aug 1995
1.0 Jan 2006
1.0 Jan 2003

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