Why are my background images not WebP?

Typically background images are located within CSS files which do not have universal support for WebP images yet with browsers.

It's actually faster and more compatible to load the non-WebP image in that case than to dynamically rewrite CSS or JS files - and even then it may not be compatible for the location the image is in (such as a background slider etc.)

But don't worry, once cached over the CDN the difference in speed is practically negligible!||
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