What is the use of script tags in html
This article is about what the script tag is used for in html. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.
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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