In Visual Studio (2013, if it's significant) I see this in the "Scripts" section of a .cshtml file:
The green undersscores may actually be being rendered by Resharper (version 2016.1, if it's significant).
I suspect this is some sort of warning, but how can I see what the warning is, and how to resolve whatever is causing the warning? Hovering does nothing; 2-clicking does invoke a "Format Selection" icon (doubtless from Resharper), but selecting it does nothing.