CSS AT-rules support in Opera Presto 2.4

At-rules start with an at-keyword, an "@" character, and followed immediately by an identifier (for example, @import, @page). An at-rule consists of everything up to and including the next semicolon (;) or the next block, whichever comes first.

See these Web pages for further reference:

The following table defines which CSS AT-rules are supported by Opera.

CSS AT-rules support in Opera Presto 2.4
At-rule Level Support
@charset CSS 2 Yes
@font-face CSS 3 Yes
@import CSS 1 Yes
@media CSS 2 Yes
@namespace CSS 3 Yes
@page CSS 2 Yes
@phonetic-alphabet CSS 3 No

Documentation

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