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HTML tags

examples

Output "Helloworld" via JavaScript:

[xss_clean]("HelloWorld! ")

browser support

All major browsers support tags.

Label definition and instructions

Tags are used to define client-side scripts, such as JavaScript.

Elements can contain script statements or point to external script files through the "src" attribute.

JavaScript is commonly used for image manipulation, form validation, and dynamic content change.

Tips and comments

Note: If the src attribute is used, the element must be empty.

Tip: See the element, which is useful for users who disable scripting in their browsers or whose browsers do not support client-side scripting.

Note: There are several ways to execute external scripts:

If async="async": script executes asynchronously relative to the rest of the page (script will be executed as the page continues to parse)

If async is not used and defer="defer": the script will execute when the page completes parsing

If you do not use async or defer: immediately read and execute the script before the browser continues parsing the page

Differences between HTML4.01 and HTML5

The "type" attribute was required in HTML4, but optional in HTML 5.

The "async" attribute is new in HTML5.

Some attributes from HTML4.01 are no longer supported in HTML5:"xml:space."

Differences between HTML and XHTML

In XHTML, the content type in the script is declared #PCDATA (instead of CDATA), meaning that the entity is parsed.

This means that in XHTML, you should encode all special characters or nest everything in a CDATA section:

//

var i=10;

if (i

global properties

Tags support global attributes of HTML.

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