Tag <script> In HTML
In this article, we look at some examples of Tag script with the belief that it will assist us gain knowledge.
The <script> tag is an HTML tag used to define a client-side script that is executed by the web browser. The script can be written in JavaScript, VBScript, or any other scripting language that is supported by the browser. The <script> tag is usually placed in the <head> section of an HTML document or at the end of the <body> section.
“Hello World!” can be written in JavaScript:
Example:
Tag <Script> Usage
Tag <script> tag is employed to incorporate a client-side script known as JavaScript.
Whenever we discuss regarding Tag <script>, the src property refers to an independent script file or includes scripting commands.
JavaScript is frequently used for Client-side validation, Dynamic web content, and Interactive user interfaces.
Here is an example of the alert box in JavaScript:
Example:
When a button is clicked, this example shows how to change the text inside an element:
Example:
This example illustrates how to make a button click modify the background color of an item:
Example:
IMPORTANT: There’s many numerous ways to run an external script:
- When async=”async” is set, the script runs in parallel with the main page (the script runs simultaneously while the page is processing data).
- Script will be executed after page processing in case async is not specified and defer=”defer”.
- By default, a script is retrieved and executed prior to the browser beginning to process the page whenever async or defer is enabled.
Uses of Script Tag
The <script> tag in HTML has many uses, and is one of the most powerful and versatile tools available to web developers. Here are some common uses of the <script> tag:
- The <script> tag is commonly used to add interactivity to web pages. JavaScript code can be used to respond to user actions such as button clicks, form submissions, and mouse events.
- The <script> tag can be used to perform client-side form validation. This can help to ensure that user-entered data is valid before it is submitted to the server.
- The <script> tag can be used to manipulate HTML and CSS elements on the page. This can be used to create dynamic effects such as animations and transitions.
- The <script> tag can be used to load external JavaScript files into a web page. This is useful for including third-party libraries and plugins.
- The <script> tag can be used to track user behavior on a web page. This can be used to gather analytics data and improve the user experience.
- The <script> tag can be used to create cookies, which can be used to store user preferences and other data.
Attributes
Global
The Tag script <script> are compatible with Global Attributes in HTML.
Attributes List
| Attributes | Value | Overview |
|---|---|---|
| async | async | Indicates that this script is processed asynchronously (used only for external scripts). |
| crossorigin | anonymous use-credentials | Specifies the HTTP CORS mode for the request. |
| defer | defer | Indicates that the script is invoked after the page has completed processing (in the case of external scripts). |
| integrity | filehash | Provides a way for a browser to guarantee that manipulated code is not rendered if the script is loaded. |
| nomodule | True False | Prevents the script from being executed in browsers compatible with ES2015. |
| referrerpolicy | no-referrer no-referrer-when-downgrade origin origin-when-cross-origin same-origin strict-origin strict-origin-when-cross-origin unsafe-url | In order to fetch a script, determine which referrer information should be sent. |
| src | URL | An external script file URL is provided. |
| type | scripttype | An indication of the script’s media type. |
A comparison of HTML and XHTML
In XHTML, scripts are specified as #PCDATA (rather than CDATA), indicating that entities are processed.
As a result, XHTML should encode all special characters, or wrap all content in CDATA:
<script type="text/javascript">
//<![CDATA[
function changeColor() {
document.getElementById("elementId").style.backgroundColor = "blue";
}
//]]>
</script>Browser Compatibility
| Element |  |  |  |  |  |
|---|---|---|---|---|---|
| <script> | Yes | Yes | Yes | Yes | Yes |
Predefined CSS
Whenever it comes to Tag script, many browsers will present the <script> tag with these default values:
script {
display: none;
}HTML Script Tag Benefits
Here are some of the key benefits:
- The <script> tag allows developers to add interactivity to web pages, making them more engaging and dynamic. This can improve the user experience and increase user engagement.
- The <script> tag allows developers to load scripts asynchronously, which can improve page load times. This can be particularly beneficial for large or complex web applications.
- The <script> tag is supported by all modern web browsers, making it a reliable and widely-used tool for web development.
- The <script> tag is relatively easy to use, and does not require extensive knowledge of web development to get started.
- The <script> tag allows developers to add complex functionality to web pages, such as form validation, data processing, and dynamic content creation.
- The <script> tag can be used to track user behavior on a web page, which can be used to gather analytics data and improve the user experience.
