CSS
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Feature queries in CSS allow you to test whether a particular feature is supported by the browser before applying styles that use that feature. This means that you can take advantage of the latest features and functionality, while still ensuring that your site looks good on older browsers and devices. This is done by testing…
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CSS Custom Properties, also commonly referred to as CSS Variables, is a specification that allows you to declare a property and use it later on in your stylesheet. This works similar to how you would declare a variable with a preprocessor.