Updating info about prefixes as it is missing.

posts/box-shadow.md

@@ -1,9 +1,11 @@
 feature: box-shadow
 status: caution
-tags: none
+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 pageload. Users without a modern browser will not see a shadow, but aren't checking your site in multiple browsers anyhow.
+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.