The media rule that must be included in a cascading style sheet is:
media
devices
{
style rules
}
The media rule is used in media queries to apply different styles for different media types/devices. It should be noted that media queries can be used to check many things, such as the width and height of the viewport. width and height of the device.
Media queries are a key part of responsive web design, as they allow one to create different layouts depending on the size of the viewport and they can also be used to detect other things about the environment your site is running on, for example, whether the user is using a touchscreen rather than a mouse
A media query consists of a media type and can contain one or more expressions, which resolve to either true or false. media not|only mediatype.
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