What is the difference among link styles?

There are three types of link styling: line underline, dashed underline and dotted underline. What is the difference among them and in what cases each of them should be used?

Often I see dashed links do something without leaving the page, like just opening a pop-over on hover. Another example I saw is on website work.ua where you click on the dashed "accountant" link and that text is put in the search bar (but search button is not triggered) but underlined "Advanced search" links to another page. So I think there are some guidelines or common practice people follow.