You will need a web browser. To fully experience all the features discussed in this book, use Chrome 22 or later or Firefox 22 or later. Internet Explorer 11 or later should also work. A text editor is also recommended, especially if you are not using Chrome, as discussed in Chapter 1, Hello, Three.js. You will need an Internet connection at certain points in the book such as when downloading the Three.js library (these points will be identified in the text).