@namespace rule

Declares an XML namespace (and, optionally, its prefix) and associates it with a string that represents a namespace name.

Selectors Level 3, Section 3

Syntax

@namespace prfx? sUrl

Parameters

prfx

Optional. A String value that specifies a namespace prefix.

sUrl

A URL Stringvalue that specifies a namespace name.

Standards information

Remarks

The scope of an @namespace rule is the style sheet that it is declared in. You must declare an @namespace rule after any @charset or @import rules.

Examples

The default namespace is applied to names that do not have an explicit namespace component. The following rule declares a default namespace.


@namespace "http://www.w3.org/1999/xhtml";

If you declare an @namespace rule with a prefix, you can use the prefix in namespace-qualified names. For example, consider the following namespace declaration for a namespace prfx.


@namespace prfx "http://prfx.contoso.com";

Based on the previous declaration, the following selector matches E elements in the namespace that the prfx prefix refers to.


prfx|E

The following code example creates two namespace prefixes. First, p elements in any namespace are colored red. Any p elements in the prfx namespace are then recolored blue, and p elements in the msft namespace are recolored green.



          @namespace prfx "http://prfx.contoso.com";
@namespace msft "http://msft.example.com";
 p {background-color:red;}
prfx|p {background-color:blue;}
msft|p {background-color:green;}
        

The following code example styles a SVG element. By using the namespace and declaration from this example, all circles that are created with SVG are given a red fill.



          @namespace svg "http://www.w3.org/2000/svg";
svg|circle {fill:red;}
        

See also

Reference
style
styleSheet

 

 

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