Download Building Polyfills by Brandon Satrom PDF

By Brandon Satrom

Add customized gains to browsers previous and new via writing polyfill libraries, JavaScript plugins that take browsers past their local functions. during this sensible fieldbook, writer Brandon Satrom introduces ideas and directions 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 allow you to attempt and paintings with rising suggestions, usually prior to browser owners. 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 kingdom of polyfills, together with shims, opt-ins, and drop-ins
  • Use rules and practices to construct liable polyfills that gain the full net improvement group
  • Build out numerous beneficial properties for an HTML5 varieties polyfill library
  • Configure a construct atmosphere and run computerized cross-browser trying out
  • Optimize functionality, deal with part situations, and fine-tune the rate of your polyfill
  • Get examples of prollyfilling libraries that push the limits of the net
  • Write a pattern prollyfill and evaluate it to present polyfill builds

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Additional resources for Building Polyfills

Example text

Example WebIDL snippet for the HTML form element So Web IDL specifies the interface that browsers are to use when building a standard implementation, and browsers do exactly that. What’s more, most of them—perhaps even all of them, but I can’t claim all without seeing Internet Explorer’s code base, which Principles of Responsible Polyfill Development | 17 is not open source—automatically generate Web IDL bindings directly from the specdefined IDL. Chrome even includes Web IDL docs for developers working with the browser source.

Let’s expand our polyfill by adding support for an additional input type. 13 Number state When an input element’s type attribute is in the Number state, the rules in this section apply. The input element represents a control for setting the element’s value to a string repre‐ senting a number. If the element is mutable, the user agent should allow the user to change the number represented by its value, as obtained from applying the rules for parsing floating-point number values to it. User agents must not allow the user to set the value to a nonempty string that is not a valid floating-point number.

Mind (Only) the Gaps This is a simple principle, but an important one to highlight nonetheless. When building your polyfill, it’s important to never lose sight of the fact that your library’s purpose in 18 | Chapter 2: Principles and Practices of Polyfill Development life is to fill in the gaps in other browsers—or to iterate on experimental APIs, in the case of a prollyfill—and nothing more. You should resist the temptation to add nonstandard features simply because you want them or developers are clamoring for them.

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