To create this interactive we used data from real stellar evolution
models. The data (http://pleiadi.pd.astro.it/#data7) did
NOT show the complete evolution for all stars. Thus there are evolutionary phases after the last point in the interactive (the Red Giant Branch) which we can not show here. You should consult your textbook to learn more about these later stages of evolution (like the
planetary nebula and white dwarf phases).
Also these models were
run for stars that had no "metals", meaning no elements other than those
created in the big bang. That means these stars have slightly
different histories than those we see in the disk of the Milky Way including the loops seen early in the Red Giant phase for some of the stars.
One other point to note is that we
have shifted the colors a bit to the red to emphasize that stellar
colors change with time. In reality the stars shown in this interactive
would appear more blue on the sky.