When web fonts are done loading, you should see each of the following text set in its own font name (I purposely added in a 1-second delay):

I am Bitter.
I am Raleway.
I am Arvo Bold.
I am Pacifico.
I am Amatic SC.

You can either view the source of the page or read the Font Loading with Font Events tutorial for a more in-depth overview.

Read the Tutorial