Sometimes you need to work on application code and a dependency at the same time. You might be the author of a dependency and don’t have good test coverage yet. The application can serve as an end-to-end test for the dependency. Maybe you need to debug an issue in your application and the problem seems to be in the dependency sources.
Before we come to how to style underlines, we should answer the question: should we underline?In graphic design, underlines are generally seen as unsophisticated. There are nicer ways to draw emphasis, to establish hierarchy, and to demarcate titles.