Building Polyfills

Part I. Building Polyfills

In this first part, we’ll explore the world of polyfills as they exist today. In Chapter 1, we’ll discuss the origin of polyfilling, and in Chapter 2 I’ll share some principles and practices for the polyfill developer to consider when building libraries for cross-browser compatability. In Chapters 3 through 5, we’ll get our hands dirty and walk through building a polyfill for the HTML5 Forms specification. We’ll also cover testing and build workflows and the all-important subject of polyfill performance.