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feature: box-shadow status: caution tags: prefixes kind: css polyfillurls:

box-shadow is safe to use most of the time, except when you are applying it on a large area as that may cause significant performance impact when interacting with the page (on scroll and hovers, but also transitions and animations).

Polyfills are unnecessary for box-shadow. They are too costly and slow down page load. Users without a modern browser will not see a shadow, but aren't checking your site in multiple browsers anyhow.

Box shadows can also be applied safely without prefixes.

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