Is Anyone Still Using Polyfills in 2026?

The article argues most JavaScript features that once required polyfills now have broad browser support, noting Array.flat, Object.entries, and fetch reach 94-96% of users globally. It advises auditing bundlers with browserslist and source-map-explorer, removing inherited polyfill config, and self-hosting any genuinely needed polyfills rather than loading from third-party CDNs after the 2024 polyfill.io supply-chain incident, with Decorators and Temporal cited as remaining exceptions.