Brandon Satrom - Building Polyfills
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Add custom features to browsers old and new by writing polyfill libraries, JavaScript plugins that take browsers beyond their native capabilities. In this practical fieldbook, author Brandon Satrom introduces principles and guidelines for polyfill development, and then walks you through the steps for building a complex, real-world HTML5 polyfill.
Youll also explore the future of polyfillingor prollyfillingthat will enable you to test and work with emerging concepts, often ahead of browser vendors. By the time you finish this book, youll have the tools and hands-on experience you need to build reliable polyfills for todays and tomorrows Web.
- Learn the current state of polyfills, including shims, opt-ins, and drop-ins
- Use principles and practices to build responsible polyfills that benefit the entire web development community
- Build out several features for an HTML5 Forms polyfill library
- Configure a build environment and run automated cross-browser testing
- Optimize performance, handle edge cases, and fine-tune the speed of your polyfill
- Get examples of prollyfilling libraries that push the boundaries of the Web
- Write a sample prollyfill and compare it to current polyfill builds
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If you play a game of word association with a room full of frontend developers, polyfill will no doubt receive mention from more than a few participants. This wordtraditionally a synonym for fallback , spackle , or patch was unfamiliar to many developers until just a few years ago, but has become a staple of conversations about modern and open web technologies. And while polyfilling has traditionally operated as a practice for delivering modern features to nonmodern browsers ( oldIE , meaning IE68, is increasingly a synonym for older browsers), the concept has expanded over the last few years to include the addition of new and experimental platform features to all browsers, including the newest and most cutting-edge.
Before our eyes, the practice of polyfilling is evolving from an adoption technique to a full-blown design pattern that allows developers to spackle their browsers with whatever semantics they wish. AngularJS, a very popular and fast-growing app framework, encourages this practice by enabling developers to use directives to add custom HTML tags and components to their applications.
Design by polyfill extends beyond frameworks as well. One such example is the Web Components effort, a set of specifications in the W3C designed to make the creation of custom semantics and encapsulated components a feature in the browser itself. With Web Components, if you want a component, you need only create one yourself, or grab one from a third party. Its a powerful idea, and if the concept takes off, it will unlock a new set of capabilities for web developers while adding new depth and richness to the applications we create.
When it comes to the art of patching browser capabilities via polyfills, developers fall into two camps: those using polyfills to provide modern web platform capabilities in their sites, and those building polyfills for the broader web community. The book is primarily focused on the latter camp, and is intended to serve as an introduction to polyfilling, to provide a set of principles and practical guidelines for building reliable polyfills , and finally, to provide a road map for the future of polyfilling itself. However, even if youre a JavaScript developer not especially interested in building polyfills, theres a lot of useful content in this book in the realm of test-driven development (TDD), JavaScript build workflows, and performance optimizations.
At present, countless articles and book chapters exist that cover the subject of polyfilling. However, in nearly every case, these articles are targeted at polyfill consumers, not the intrepid developers who build these libraries. One notable exception is Addy Osmanis guide for polyfill developers, an introductory read that I highly recommend. Beyond Addys article, there are few resources, online or in print, that cover the topic of polyfills from the viewpoint of the developer. A lack of definitive resources for building these libraries means that we must strike out on our own, or slowly dig through other libraries for patterns and ideas.
My sincere hope is that this book will close the gap by serving as a field guide for polyfill developers. Well start with a cursory introduction to polyfilling on the web platform, and Ill share some principles and guidelines for building polyfills that developers can rely on. Once the guidelines have been established, well shift the discussion to an in-depth walk-through of building a real-life, reasonably complex polyfills.
Once Ive covered the ins and outs of building polyfills, the last two chapters will shift to focus on that emerging trend on the web platform: the forward polyfill , or prollyfill . This pattern, as Ive mentioned already, enables developers to test and work with emerging concepts, sometimes ahead of the browser vendors themselves. By the time were done, youll have all the tools you need to build reliable polyfills for the present, and the future, of the Web.
This book is organized into two parts. In the first part, we discuss the ins and outs of polyfill development, starting with the current landscape of polyfilling in , where Ill walk through a couple of cases in which we can improve the speed of our polyfill.
In Part II of this book, well turn our focus to the future of polyfilling, the prollyfill . In , well close out the book with another walk-through and build a prollyfill for a cutting-edge web platform specification. Once were done, you should be well equipped to jump into the present, and future, of polyfilling.
The following typographical conventions are used in this book:
Constant width Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords. Constant width bold Shows commands or other text that should be typed literally by the user. Constant width italic Shows text that should be replaced with user-supplied values or by values determined by context.This element signifies a tip or suggestion.
This element signifies a general note.
This element indicates a warning or caution.
Supplemental material (code examples, exercises, etc.) is available for download at http://bit.ly/kendo-ui and http://bit.ly/slacker-js.
This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Building Polyfills by Brandon Satrom (OReilly). Copyright 2014 Brandon Satrom, 978-1-449-37073-2.
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