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The project for this chapter is a presentation of the official HTML5 logo, with accompanying text. The shield and letters of the logo are drawn on a canvas element and the accompanying text demonstrates the use of semantic tags. The viewer can change the size of the logo using a slider input device. It is an appropriate start to this book, a collection of projects making use of HTML5, JavaScript and other technologies, because of the subject matter and because it serves as a good review of basic event-driven programming and other important features in HTML5.

High Performance JavaScript

When JavaScript was first introduced as part of Netscape Navigator in 1996, performance wasn’t that important. The Internet was in its infancy and it was, in all ways, slow. From dial-up connections to underpowered home computers, surfing the Web was more often a lesson in patience than anything else. Users expected to wait for web pages to load, and when the page successfully loaded, it was a cause for celebration.