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At-rules are special instructions for the CSS parser. They are invoked by an at-keyword preceded by an "@" sign.
|@charset||Specifies the character encoding of the style sheet.|
|@font-face|| The |
|@keyframes||Sets the keyframes for the CSS animation property.|
|@namespace||Declares the default namespace and binds a namespace to a namespace prefix.|
|@viewport||Specifies the size, zoom factor, and orientation of the viewport.|