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Line 83: Changed "blue" to "red"
As the reader, I like to see more of Figure 5.1, an example of code -> output. This visual element helps me understand the content better.
The main difference between navbarPage and tabsetPanel (below Figure 5.2) is confusing to me. A diagram illustrating the differences would be better.
Section 5.3.2 "View Local Changes" is very nicely organized!