HTML Tags - Script Tag

What is the HTML <script> tag ?

HTML <script> tag is used to embed a client-side script (JavaScript).

HTML <script> tag contains the scripting statements, or it points to an external script file.

HTML facilitates the users to place a <script> (javascript) within your HTML document.

JavaScript is not the same as Java Programming language.

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

How HTML <script> tag works ?

HTML allows the user to write any type of client side script inside <script> tag in html.

This script tag identifies a block of script code in the html page. It also loads a script file with src attribute.

The <script> element can also be used with other languages, such as WebGL’s GLSL shader programming language and JSON.

What HTML <script> tag is used ?

Common use of JavaScript while creating websites.

1. User-side validation.

2. Displaying modal windows and dialog boxes.

3. Dynamically manage the content, element style, or even structure.

4. Send/Receive data from server.

5. Implements slider, carousel, accordion.6. Image manipulation, form validation, and dynamic content.

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Syntax :

<script> 
    // code to be executed
</script>

Example 1 :

<!DOCTYPE html>
<html>
        <head>
                <title>script tag</title>
                <style>
                        h1 {
                                color:blue;
                        }
                </style>
        </head>
        <body>
		<h1>Welcome to CSTechbook</h1>
                <h2>Script Tag</h2>
                <p id="cstech"></p>
                <script>
      document.getElementById("cstech").innerHTML = "Welcome to CSTechbook!!!";
                </script>
        </body>
</html>

Output :

Example 2 :

<!DOCTYPE html>
<html>
        <head>
                <title>script tag</title>
                <style>
                        h1 {
                                color:blue;
                        }
                </style>
                <script>
                        function cstech() {
                                alert('Welcome to CSTechbook!');
                        }
                </script>
        </head>
        <body>
                <h1>CSTechbook</h1>
                <h2>Script Tag</h2>
                <button type="button" onclick="cstech()">
                        Welcome to CSTechbook.com</button>
        </body>
</html>

Output :

<script> Tag Attributes

HTML <script> tag support following specific attributes.

Sno	Attributes	Value	Description
1	async	async	Specifies that script will executed asynchronously as soon as it’s loads. Note: This attribute must be used only for external embedded file.
2	charset	charset	Specifies the character encoding of external JavaScript file.
3	defer	defer	Indicates that script will be executed, once page is loads completely. Note: This attribute must be used only for external embedded file.
4	src	URL	Specifies the URL of an external JavaScript file.
5	type	MIME_type	Specifies the valid MIME type of the scripting languages.

Global Attributes

HTML <script> tag support following global attributes.

Sno	Attributes	Value	Description
1	id	unique_name	Declared unique id for an element.
2	class	class_name	Declared one or more classnames for an element.
3	style	styles	CSS inline styles specify an element.
4	title	title	Specify extra details of element contain, this will display as a “tooltip” for an elements.

Event Attributes

HTML <script> tag support following event attributes.

Sno	Attributes	Value	Description
1	onfocus	script	element gets focus on object when script tobe run.
2	onblur	script	element lose the focus on object when scrip tobe run.
3	onabort	script	element gets aborted on object when script tobe run.
4	onchange	script	element gets anytime change on object when script tobe run.
5	onbeforeunload	script	element gets unloaded on object when scrip tobe run.
6	onclick	script	clicked on object when script tobe run.
7	ondblclick	script	double click on object when script tobe run.
8	onkeydown	script	key is pressed when script tobe run.
9	onkeypress	script	key is pressed over element then released when script tobe run.
10	onkeyup	script	key is released over element when script tobe run.
11	onmousedown	script	mouse button was pressed over an element when script tobe run.
12	onmouseout	script	mouse pointer release over an element when script tobe run.
13	onmousemove	script	run mouse pointer moved when script tobe run.
14	onmouseover	script	run mouse pointer move over when script tobe run.
15	onmouseup	script	mouse button is released when script tobe run.
16	onreset	script	form has been reset when script tobe run.
17	onselect	script	Select some content when script tobe run.
18	onsubmit	script	form has been submitted when script tobe run.
19	onload	script	object has load when script tobe run.
20	onchange	script	allow to change the object when script tobe run.
21	onunload	script	unload to the browser window when script tobe run.
22	ondrag	script	element being dragged when script tobe run.
23	ondragend	script	element being stop dragged when script tobe run.
24	ondragenter	script	element being go target dragged when script tobe run.
25	ondragleave	script	element being leave to target dragged when script tobe run.
26	ondragover	script	element being over to target dragged when script tobe run.
27	ondragstart	script	element being start dragged when script tobe run.
28	ondrop	script	element being dropped when script tobe run.
29	onerror	script	element error occurs when script tobe run.
30	onmessage	script	element message display when script tobe run.
31	onerror	script	element error occurs when script tobe run.
32	onmousewheel	script	mouse wheel will be rotate when script tobe run.
33	onscroll	script	scrollbar is scroll when script tobe run.
34	onresize	script	element should be resize when script tobe run.
35	onselect	script	all element content selected when script tobe run.
36	onstorage	script	element should be store in target when script tobe run.

Browser Compatibility

Sno	Browser	Support
1	Chrome	Yes
2	Firefox	Yes
3	Edge	Yes
4	Opera	Yes
5	Safari	Yes
6	Internet Explorer	Yes