With the advent and increase in popularity of the mobile web, developers have had to adapt themselves to handling new challenges, such as different layouts in different resolutions, the new user experience paradigm, and optimization for low-bandwidth connections. While facing this, there were also a lot of old problems related to browser compatibility and lack of patterns in the community.
This was the outline scenario when the Bootstrap framework arrived. Developed by Twitter, the main goal of Bootstrap is to provide a web frontend framework for responsive developing with cross-browser compatibility. It is awesome! Developers fell in love with it and started to adopt it right away.
Therefore, to cover this book's objective of presenting the Bootstrap framework to build responsive, mobile-first websites faster than ever before, we must get started by setting up our work environment in the best recommended way. Thus, the topics that we will cover in this chapter are:
There are several versions of the framework, but in this book, we will provide support for the latest Bootstrap 3 version (which is v3.3.5), along with the newest version 4 (which is 4.0.0-alpha). When a feature or component is differently supported by one of these versions, we will point it out properly.
First of all, access the official website at http://getbootstrap.com/ and click on the Download Bootstrap button, as shown in the following screenshot:

Downloading the example code
You can download the example code files for this book from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.
You can download the code files by following these steps:
Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:
Then you will be redirected to another page that contains these buttons:
Click on the Download Bootstrap button to get the framework, since we will cover the full framework using, not Sass, but just HTML, CSS, and JavaScript. After the download, extract the files and you will see that the framework is organized in folders.
Other versions and releases
Check out the official repository at https://github.com/twbs/bootstrap/ to pick up other versions and see the new releases under development. You will also be able to see other features and community activity.
If you want to go hands-on straightforward with version 4, go to http://v4-alpha.getbootstrap.com/ and download it, or enter the GitHub repository and select the corresponding branch of version 4.
After you've extracted the files, you will see some folders. The first one, in alphabetical order, is css. Here, you will find the main CSS file (named bootstrap.css), other files related to the minified version, and a bootstrap-theme.css file, which is a simple theme of using the Bootstrap components.
There is also a fonts folder; it contains the files used for the icon components that we will see in future chapters. Finally, there is a folder named js, where we can find the bootstrap.js file, the minified version, and the specification for npm.