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80).
Thus, it??™s not the prefix, but the corresponding namespace URIs in the markup and
at-rule, that must match.
57 At-rules Reference
Compatibility
Opera Safari Firefox Internet Explorer
9.2 3.0 2.0 1.3 2.0 1.5 1.0 7.0 6.0 5.5
Full None None None Full None None None None None
This at-rule isn??™t widely supported.
At-rules Reference
Chapter 4
Selector Reference
A selector is a pattern; it??™s the part of a CSS rule that matches a set of elements in
an HTML or XML document. The declarations that appear in the block that follows
the selector are applied to all elements that match this pattern, unless they??™re
overridden by another rule in the cascade (p. 117).
As is discussed briefly in Selectors (p. 26), a selector can contain a chain of one or
more simple selectors separated by combinators. A pseudo-element (p. 106)??”for
example, :first-line??”can also be included after the last simple selector in the
chain.
A simple selector contains either an element type selector (p.


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