FAQ: CSS Variables - Responsiveness

This community-built FAQ covers the “Responsiveness” exercise from the lesson “CSS Variables”.

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This exercise can be found in the following Codecademy content:

Learn Intermediate CSS

FAQs on the exercise Responsiveness

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Hi, I’m getting a little confused here, looking for some insight.
in the last Media Queries class, I have learned to use

@media only screen and (max-width: 700px)

but in CSS VARIABLES lesson 7/8, I saw two ways have been written in the example.

such as

@media (max-width: 700px)

in the CSS coding section.

@media screen and (max-width: 700px)

shown in the left description bar as an example.

What’s the difference between those three ways?
Why use “only” or why “only” “screen
and sometimes we don’t?

Hope someone can help, thanks!!

Are three different ways of doing the same thing.
The “screen” is redundant because the default media if not specified is always “screen”.
The “only” tells the browser to trigger the media feature only when the maximum width is 700px or less.
So, given that the shorthand @media(…) is widely supported and used for this purposes, the other are longer and redundant formats.