This is a regular paragraph. When using <em> we obtain this effect. When, instead, we use <ref> we obtain this other effect. Another interesting modifier is <code> wich produces this effect.

Here is an example of <br>. Here we go to the next line without closing the paragraph tag.
This is a regular paragraph. 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.