How to Create a Backdrop Blur Effect with CSS, Even in Older Browsers?

CSS: Backdrop-Filter Polyfill

Backdrop-filter, a CSS feature enabling blur and other effects on the background of an element, remains largely unsupported in modern browsers. As an alternative, consider using a slightly transparent background as a fallback:

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

@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 provides a transparent fallback for browsers lacking backdrop-filter support, while enabling a blurred effect in supported browsers. The CSS also allows for future CSS revisions that may introduce unprefixed backdrop-filter support.

Visualization:

[Image of transparent fallback without backdrop-filter support] [Image of blurred effect with backdrop-filter support]

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