Describes the characteristics of a particular font.
What Are At-Rules?
At-Rules extend CSS Rule Set syntax beyond simple Selector/Declaration
blocks. Any functionality in CSS that does not fall under the umbrella of
selector/style declaration pair bindings uses a special At-Rule syntax.
Syntax: An At-Rule begins with the "@" character
followed immediately by a keyword. Following the keyword separated by
a space is an At-rule statement appropriate to the At-keyword used.
If the At-Rule is a simple declarative statement (charset, import, fontdef),
it is terminated by a semi-colon (";".) If the At-Rule is a conditional
or informative statement (media, page, font-face), it is followed
by optional arguments and then a style declaration block inside
matching curly braces ("{", "}".) At-Rules are sometimes nestable,
depending on the context. If any part of an At-Rule is not understood,
it should be ignored.