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Add runtime polyfills for finished ECMAScript features with core-js v3 stable while keeping syntax transforms separate.
IE10 implements the 2012 Flexbox draft, not the modern spec. Learn the -ms- dialect, its property mappings, its limits, and a strategy for shipping layouts that actually render.
IE10 supports Flexbox — but only the abandoned 2012 draft syntax behind -ms- prefixes. Here's what that syntax looks like, why you shouldn't hand-write it, and why a float-based fallback is usually the smarter call.
corejs