Building Polyfills by Brandon Satrom

By Brandon Satrom

Add customized positive factors to browsers outdated and new by way of writing polyfill libraries, JavaScript plugins that take browsers past their local functions. during this functional fieldbook, writer Brandon Satrom introduces ideas and guidance for polyfill improvement, after which walks you thru the stairs for development a posh, real-world HTML5 polyfill.

You’ll additionally discover the way forward for polyfilling—or prollyfilling—that will make it easier to attempt and paintings with rising options, frequently sooner than browser proprietors. by the point you end this publication, you’ll have the instruments and hands-on adventure you must construct trustworthy polyfills for today’s and tomorrow’s net.

  • Learn the present country of polyfills, together with shims, opt-ins, and drop-ins
  • Use rules and practices to construct in charge polyfills that profit the complete internet improvement neighborhood
  • Build out numerous gains for an HTML5 kinds polyfill library
  • Configure a construct atmosphere and run computerized cross-browser checking out
  • Optimize functionality, deal with side instances, and fine-tune the rate of your polyfill
  • Get examples of prollyfilling libraries that push the bounds of the net
  • Write a pattern prollyfill and examine it to present polyfill builds

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Additional info for Building Polyfills

Example text

Example 3-1. kendoForm(); Example 3-2. body); To support both of these approaches in my polyfill, I’ll need to follow Kendo UI’s rec‐ ommended approach for creating custom widgets. First, I’ll create the core source file for my polyfill in the src/ folder for my project. js, which follows a naming convention similar to other Kendo UI source files. Then, in my new source file, I’ll include the code in Example 3-3. Example 3-3. Form). kendoForm. plugin(Form); } (jQuery, kendo)); As illustrated here, my polyfill starts with an Immediately-Invoked Function Expres‐ sion (IIFE) that specifies my dependencies (jQuery and Kendo UI in this case).

Much like my four-yearold needs to be reminded that eating vegetables is important, I have to be reminded from time to time that specifications are very useful, even to us lowly web developers. For the polyfill developer, reading and understanding a specification is almost as im‐ portant as it is to browser implementers themselves. As we’ll discuss in the next prin‐ ciple, reading the spec is the best way to understand what your polyfill needs to provide and thus is essential. It’s the most rule-like of all these principles, but also the most important.

In this chapter, I’m going to walk through some practical steps for building cross-browser polyfills via an actual, realworld project that I created. We won’t go through every line of code or every excruciating detail, but I will introduce you to some practical examples and considerations that you’ll want to keep in mind for your own polyfill development, no matter the web platform feature being targeted. We’ll start with a discussion on project setup and structure before diving into setting up your API and deciding what you plan to build and not to build.

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