CSS @supports in JavaScript

John Sylvain - January 22, 2019

CSS @supports is pretty handy for setting up fallback for older browsers when using new CSS features. But what if you need to determine browser support in your JavaScript code? Here's what that looks like:

CSS.supports('position', 'sticky');

An example

Consider the need to apply styling via JavaScript. You might need to determine a browser specific prefix, which could look like the following:

const prefix = CSS.supports('position', 'sticky')
    ? 'sticky'
    : CSS.supports('position', '-webkit-sticky')
      ? '-webkit-sticky'
      : '';


  • CSS.supports and @supports is not supported in IE.
  • I recommend against using not when using either CSS.supports or @supports, especially when targeting older browsers.