Feature Detection in JavaScript

Checking whether a browser supports an API or syntax at runtime with `typeof`, `in`, `try`/`catch` and dynamic imports, instead of sniffing user agents.

Content tagged feature-detection

• Post:Backwards-Compatible JavaScript: Polyfills and Baseline

  Use new JavaScript without breaking older browsers.

  Write backwards-compatible JavaScript: feature detection, safe core-js polyfills, transpiling vs polyfilling, Baseline and browserslist queries.