Just now I have a look at the tags page and see that they all have a slash just like the things on title bar. That looks somewhat weird to me regarding that they are not at the root directory. For example
/questions has a slash because it's at the top level directory, but
/bash is not OK because it should have been
/bash would yield "No such file or directory").
This reminds me of the second design draft where the tag is surrounded by square brackets
[bash] and has a monospace font. It was my suggestion and I liked that, but anything else can be better than a slash :)