Learn about what they are and what their benefits are.
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Once you start working on very large projects with a lot of CSS in them, you will need to learn how to properly name and organize your styles. Read this introduction to learn one method of keeping your CSS manageable. This is a comprehensive and visual guide to CSS properties. Give it a quick skim and keep this in your back pocket when you need to look something up in CSS.
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A Practical CSS Cheat Sheet by Toptal Developers | Toptal
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Web Design in 4 Minutes jgthms. CSS is no exception. The benefits of using variables in CSS are not that much different from those of using variables in programming languages. For example, editing the primary color in your project will be much easier when what you need to change is one value for the --primary-color CSS custom property, rather than change that value inside multiple CSS properties in various places.
One way you might have been taking advantage of the flexibility of variables when styling websites is by using preprocessors like Sass and Less.
Preprocessors let you set variables and use them in functions, loops, mathematical operations, etc. Does this mean CSS variables are irrelevant? The differences spring from the fact that CSS variables are live CSS properties running in the browser, while preprocessor variables get compiled into regular CSS code, therefore the browser knows nothing about them.
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This opens up a whole world of possibilities! This is not to say that you need to choose between one or the other: nothing will stop you from taking advantage of the super powers of both CSS and preprocessor variables working together. The CSS custom property part looks like this:. You prefix the custom property with two dashes and assign a value to it like you would with a regular CSS property.
The cascading variable part consists in applying your custom property using the var function, which looks like this:. Then it uses the var function to apply that value to the background-color property of the container with ID of foo , which as a consequence will now have a nice light blue background. You can use the same nice light blue color value to style other color properties of multiple HTML elements, e.
The snippet above creates the --my-gradient variable and sets it to the value of both the --top-color and --bottom-color variables to create a gradient. Now, you can modify your gradient at any time anywhere you have decided to use it by just changing the values of your variables.
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No need to chase all the gradient instances all over your stylesheets. For example:. In the snippet above, is a fallback value. If fallbacks are not included, in case of invalid or unset custom properties, the inherited value will be applied instead. If you reassign a different value to your custom property inside another element, all children of this element will inherit the new value.
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For instance:. The first paragraph in the markup above inherits its value from the global --main-color variable, which makes it blue. The paragraph inside the div element with the class of. You can scope your variables locally inside each parent container, set them to your desired color, and the icon inside each container will inherit the appropriate color from its parent.