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.
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 ...