@rules

@page

Defines page attributes such as margin, orientation, crop marks when printing the document.

@media

Defines the media types, features and queries that can display a set of style rules.

Media queries are an important part of responsive web development, where the design of the site adjusts to different size windows and devices.

Queries can contain width, height, device-with, device-eight, color, color-index, monochrome, orientation, aspect-ratio, device-aspect-ratio, resolution, scan, grid. Many of those accept min or max prefix.

See also:

@import

Imports an external style sheet

@font-face

Assists in font matching between a clients local font and an embeded or downloaded font.

See also:

@charset

Character set for an external style sheet.

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