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@font-feature-values

The @font-feature-values CSS at-rule allows authors to use a common name in font-variant-alternates for feature activated differently in OpenType. It allows to simplify the CSS when using several fonts.
At-rule CSS Fonts Reference

aspect-ratio

aspect-ratio is a CSS media feature whose value is the width-to-height aspect <ratio> of the viewport.
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color

color is a CSS media feature whose value is the <integer> number of bits per color component (red, green, blue) of the feature. CSS colors can either be defined in hexidecimal format or in an RGB format.
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color-index

color-index is a CSS media feature whose value is the <integer> number of entries in the output device's color lookup table, or zero if the device does not use such a table.
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device-aspect-ratio

device-aspect-ratio is a deprecated CSS media feature whose value is the width-to-height aspect <ratio> of the output device.
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grid

grid is a CSS media feature whose value is an <mq-boolean> indicating whether or not the device is a grid or bitmap.
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height

height is a CSS media feature whose value is the viewport's height as a CSS <length>.
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hover

hover is a CSS media feature that can be used to check whether the primary input mechanism allows the user to hover over elements.
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monochrome

monochrome is a CSS media feature whose value is the <integer> number of bits per pixel in the output device's monochrome frame buffer, or 0 if the device is not monochrome.
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orientation

orientation is a CSS media feature that can be used to check what the orientation of the viewport is.
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overflow-block

overflow-block is a CSS media feature that can be used to check how the output device handles content that overflows the viewport along the block axis.
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pointer

pointer is a CSS media feature that can be used to check whether the primary input mechanism is a pointing device, and if so, how accurate it is.
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resolution

resolution is a CSS media feature whose value is the pixel density of the output device, as a CSS <resolution>.
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scan

scan is a CSS media feature that can be used to check what the scanning process (if any) of the output device is. The word scanning used in this context is not the same as with scanning a book or document into an image format using a scanner. Scanning here refers to the process in which an image is painted into a television (or other device) screen.
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width

width is a CSS media feature that can be used to apply styles conditionally based on the width of the viewport. The width must be specified as a <length> value.</length>
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Media queries

Media Queries is a module of CSS that defines expressions allowing to tailor presentations to a specific range of output devices without changing the content itself.
CSS Media Queries Overview Reference

Syntax

The basic goal of the Cascading Stylesheet (CSS) language is to allow a browser engine to paint elements of the page with specific features, like colors, positioning, or decorations. The CSS syntax reflects this goal and its basic building blocks are:
Beginner beginner CSS Guide Web

-webkit-box-reflect

The -webkit-box-reflect CSS property lets you reflect the content of an element in one specific direction.
CSS Non-standard Property Reference

Window.getDefaultComputedStyle()

getDefaultComputedStyle() gives the default computed values of all the CSS properties of an element, ignoring author styling.  That is, only user-agent and user styles are taken into account.
API CSS Method Reference Référence