Use of the <noscript> tag:
1. Definition and Usage
The <noscript> tag is used to provide an alternate content for users that have disabled scripts in their browser or have a browser that doesn't support client-side scripting.
The <noscript> element can contain all the elements that you can find inside the <body> element of a normal HTML page.
The content inside the <noscript> element will only be displayed if scripts are not supported, or are disabled in the user's browser.
2. Tips and Notes
Tip: It is also a good practice to use the comment tag to "hide" scripts from browsers without support for client-side scripts (so they don't show them as plain text):
3. Differences Between HTML and XHTML
4. Standard Attributes
DTD indicates in which HTML 4.01/XHTML 1.0 DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.
The <noscript> tag supports the following standard attributes:
|class||classname||Specifies a classname for an element||STF|
|Specifies the text direction for the content in an element||STF|
|id||id||Specifies a unique id for an element||STF|
|lang||language_code||Specifies a language code for the content in an element||STF|
|style||style_definition||Specifies an inline style for an element||STF|
|title||text||Specifies extra information about an element||STF|
|xml:lang||language_code||Specifies a language code for the content in an element, in XHTML documents||STF|
5. Event Attributes
According to the W3C standard, the <noscript> tag supports event attributes. However, since the noscript element is used to provide an alternate content for users that have disabled scripts, we cannot see any use for this.
|onclick||script||Script to be run on a mouse click||STF|
|ondblclick||script||Script to be run on a mouse double-click||STF|
|onmousedown||script||Script to be run when mouse button is pressed||STF|
|onmousemove||script||Script to be run when mouse pointer moves||STF|
|onmouseout||script||Script to be run when mouse pointer moves out of an element||STF|
|onmouseover||script||Script to be run when mouse pointer moves over an element||STF|
|onmouseup||script||Script to be run when mouse button is released||STF|
|onkeydown||script||Script to be run when a key is pressed||STF|
|onkeypress||script||Script to be run when a key is pressed and released||STF|
|onkeyup||script||Script to be run when a key is released||STF|