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Polyfills are pieces of code that provide modern functionalities on older browsers that do not natively support them. They ensure web applications work across different browser versions by using older ECMAScript specifications as fallbacks. Feature detection, conditional loading, and functionality implementation are the core principles of creating polyfills. Common use cases include JavaScript methods, Promises, Fetch API, Intersection Observer API, HTML5 form validation, and CSS Grid and Flexbox. Various libraries and resources such as Polyfill.io, Core-js, and MDN Web Docs offer reliable polyfills for JavaScript projects.

All About JavaScript Polyfills

<p>lol the first polyfill link takes you to a github malicious content warning</p>
