How to Achieve a Blurred Glass Effect Without Relying on `backdrop-filter`?

A Blurred Alternative to CSS's Elusive backdrop-filter

Despite its captivating effect, CSS's backdrop-filter remains elusive, with limited browser support as of July 1, 2016. While we eagerly await its full implementation, let's explore a workaround that can bring us closer to the desired blurred glass effect.

A Transparent Fallback

For browsers that lack backdrop-filter support, a slightly transparent background can mimic the frosted glass effect. The following code provides a simple fallback:

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

Leveraging Browser Support

For browsers that do support backdrop-filter, we can take advantage of its blurring capabilities. Here's an augmented version of the CSS code that caters to this scenario:

<code class="css">/* 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 code ensures that the blurred effect is applied in supported browsers, while the transparent fallback degrades gracefully for those that don't.

Examples: Seeing the Blur in Action

Without backdrop-filter support, the element displays with a slightly transparent background, as illustrated by the following image:

[Insert image of transparent fallback effect]

With backdrop-filter support, the blurred glass effect takes hold, as showcased in the following image:

[Insert image of blurred effect]

Conclusion

The backdrop-filter workaround presented here provides a practical solution for achieving a blurred glass effect on web elements, regardless of browser support. While we anticipate the full availability of backdrop-filter in the future, this technique offers a valuable alternative for enhancing the user experience.

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