feature: border-image status: use tags: fallback prefixes kind: css polyfillurls:
All main browsers support this unprefixed. You should let this fall back to either a normal solid border or no border at all, depending on whether a border is essential for readability. We recommend that you avoid polyfills.
There were some syntax changes (requiring the fill keywords) that may catch you off-guard; David Baron's border-image post describes the best course of action.