"The true felicity of a lover of books is the luxurious turning of page by page, the surrender, not meanly abject, but deliberate and cautious, with your wits about you, as you deliver yourself into the keeping of the book. This I call reading."
The target attribute specifies where to open the linked document.
I know. That's why this use doesn't seem to make sense to me. Maybe it's useful if you have a ton of such links and they'll all open into the same window as the first? In any case, it can safely be left out. Links open fine without a target attribute.