Enquire.js - Media Query Callbacks in JavaScript | CSS-Tricks

"Enquire.js is a lightweight, pure JavaScript library for handling media queries. It is less than 1kb when GZIP'd and minified, and has absolutely no dependencies. Yup, you read that right - no dependencies, not even jQuery! The most you will have to do is provide a matchMedia polyfill if you wish to support browsers without a native implementation.

Use Cases

• Responsive Design
• Mobile-first Design
• Assist older browsers with media queries [...] "

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