We can format words using the <b> tag for bold or the <i> tag for italic. We can even nest the tags like so <b><i>...</i></b> - now do you see? But be careful always close the inner tag first.

The original context of the saying O tempora, o mores is the following:

O tempora, o mores! Senatus haec intellegit. consul videt; hic tamen vivit. Vivit? immo vero etiam in senatum venit, fit publici consilii particeps, notat et designat oculis ad caedem unum quemque nostrum.