Foreword

Since jQuery’s debut in 2006, it has grown into the most popular JavaScript library for managing and enhancing HTML documents. jQuery’s cross-browser design allows developers to focus on building websites instead of puzzling out browser peculiarities. In 2013, more than one-half of the top million websites (measured by visitor traffic) use jQuery. Similarly, the jQuery UI library, which builds on jQuery, is the most popular source of UI widgets.

With that popularity comes the temptation for the jQuery team to add features so that nearly any problem encountered by a developer can be solved with the incantation of a jQuery method. Yet every feature added to the core code of jQuery means more bytes of JavaScript for website visitors to ...

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