What values can you put in a CSS Custom Property?

1 Comment on What values can you put in a CSS Custom Property?

Will Boyd:

CSS custom properties can hold all sorts of things. Some of these things were not obvious to me, which is why I decided to write this.

In short: they can contain just about everything. It’s only until CSS Custom Properties are used in a certain context as a CSS Variable — using var() — that they are evaluated.

☝️ To understand the above you should know that CSS Custom Properties are not Variables

A CSS Custom Property allows you to define a property with a certain value, e.g. --width: 200;.

It’s only when it’s used with var() — e.g. var(--width) — that you are creating a CSS Variable to use.

That’s why you can use CSS Custom Properties to:

What Can You Put in a CSS Variable? →

Published by Bramus!

Bramus is a frontend web developer from Belgium, working as a Chrome Developer Relations Engineer at Google. From the moment he discovered view-source at the age of 14 (way back in 1997), he fell in love with the web and has been tinkering with it ever since (more …)

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  1. Pingback: Injecting a JavaScript Attack Vector using CSS Custom Properties – Bram.us

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