Why does `.caret` have a "content" attribute?

Created by: ssafejava

dropdowns.less#L19 has an attribute, content: "" on .caret.

In the CSS 2.1 spec, content is only used on pseudo elements. In the CSS3 Content spec, it's used in a few places on non-pseudo elements for the purposes of quoting, etc.

It doesn't seem to have any use here, doesn't affect visible styles, and causes problems with projects like html2canvas. Setting content on a non-pseudo element bleeds into calls to window.getComputedStyle(el, ":before") (and :after), leading the script to believe a pseudo element exists where it actually does not.

It would make sense to remove it.