Download Building Polyfills: Web Platform APIs for the Present and by Brandon Satrom PDF

By Brandon Satrom

Upload customized beneficial properties to browsers previous and new by way of writing polyfill libraries, JavaScript plugins that take browsers past their local services. during this functional 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 are going to additionally discover the way forward for polyfilling - or prollyfilling - that may assist you to attempt and paintings with rising thoughts, frequently prior to browser owners. by the point you end this publication, you will have the instruments and hands-on event you want to construct trustworthy polyfills for present day and tomorrow's net.

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Extra info for Building Polyfills: Web Platform APIs for the Present and Future

Sample text

To add an override for visual elements to my polyfill, I can leverage the built-in op tions object required by all Kendo UI widgets. In Example 3-3, we used this object to specify the name of our widget, Form, which Kendo UI uses when adding our polyfill to the library namespace. I can use this object to specify any number of developerdefined features, and I’ll use it now to add an alwaysUseWidgets Boolean value. Once I’ve added that option, I’ll modify my isFormTypeSupported method to check for this property.

Specifications, be they the W3C or WHATWG variety, fall squarely into that latter cat‐ egory. If I’m being completely honest, and in a private conversation with a close friend, I’d probably even admit that I’d rather paint my living room, pull up a lawn chair, and watch that paint dry while licking 9-volt batteries, than willingly read a W3C specification. info This is not to say that these specifications aren’t useful or even a worthwhile read. As a matter of fact, they are enormously useful to their primary audience: browser imple‐ menters.

The HTML5 Forms Polyfill First, let’s take a look at our candidate library for the next two chapters: an HTML5 Forms polyfill. When I first set out to write this book, I considered a lot of different options for a guinea pig polyfill to use. I wanted to target something that was reasonably complex, but straightforward enough to introduce in bits and pieces, via text. ” And even though IE will factor into some of the hairier aspects of our polyfill development, I wanted to walk through an example with quirks in as many browsers as possible.

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