How to Emulate CSS Backdrop Filter in Browsers Without Native Support?

Workaround for CSS Backdrop Filter

Despite its promise, CSS backdrop-filter remains an elusive feature in modern browsers. With Chrome 51 offering limited support via its Experimental Web Platform flag and Safari 9.1 requiring the use of the -webkit- prefix, its practicality remains questionable. Fortunately, there are workarounds that can emulate the desired effects in the absence of native backdrop-filter support.

One promising approach involves employing a slightly transparent background as a fallback. When backdrop-filter is unavailable, this transparent background provides a discreet and blendable solution.

However, for browsers that support backdrop-filter, the code can enhance the effect by further reducing the transparency of the background and applying a blur filter. This combination effectively mimics the behavior of backdrop-filter.

To implement this workaround, simply use the following code:

<code class="css">/* slightly transparent fallback */
.backdrop-blur {
  background-color: rgba(255, 255, 255, .9);
}

/* if backdrop support: very transparent and blurred */
@supports ((-webkit-backdrop-filter: none) or (backdrop-filter: none)) {
  .backdrop-blur {
    background-color: rgba(255, 255, 255, .5);
    -webkit-backdrop-filter: blur(2em);
    backdrop-filter: blur(2em);
  }
}</code>

This solution provides cross-browser compatibility, offering a consistent visual experience regardless of the browser's support for backdrop-filter. It also includes examples to demonstrate the fallback effect and the enhanced effect with backdrop-filter support.

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