Wikipedia - hover over underlined/linked phrase has stopped working in Safari

I am experiencing the same problem in Chrome. It's frustrating because I can quickly learn about something in the original article, allowing me to have a quick read (sometimes within the explanation box) and then continue the article with a better understanding of the topic. That being said, sometimes when I click on the box I become immersed in the content there...and end up jumping from page to page as I continue to find interesting facts! It's not exactly a model that would work well in a formal learning environment, but I like to think of it as a form of free association, but tempered by some element of logic and order. Either way, I miss this and want it back!