In Chapter 4, "Theme Reference: Part 1," you have learned about some of the most important Twitter Bootstrap components, and you have started creating a reference page for all of them. In this chapter, the second part, you continue with some more components, within the same reference project.
In particular, the remaining components that I promised to present you are
Tabs, which are used to group information
Alerts, which are used to display a standout message
Progress bars, which are used to visually show to the user the percentage of a work under process already done
Cards, beautiful ...
