It's true that modern web browsers always provide a solid underline to all links by default, and that web designers like to override this behavior. On quora.com, Edo Amin explains why: if there are too many underlines on one page, the page can appear far too busy.
The current situation
Due to the aforementioned reason, most or all Stack Exchange sites seem to override the default behavior of adding a solid underline to every link.
On Mi Yodeya, links are colored at all; they have no underlines. This is fine.
On Meta Stack Exchange, links are colored; they have no underlines at all. This is also fine.
- On Meta Mi Yodeya, all links are colored and have dotted underlines. Is this ideal?
What to do
Please see the answer(s) below. Each answer describes a proposed solution. Upvote whichever proposed solution you like. If you don't like any of the proposed solutions, please post your own.