There's some squirrely behavior going on when using the [tag:tag] syntax for linking tags on Meta.

In Chrome (29.0.1547.76 m, Windows 7), when written in one continuous line in Markdown, tags overflow both the preview pane of the editor and the page:

The same happens in Firefox (24.0, Windows 7):

In IE 10 (10.0.8), the tags do wrap. However, it cuts a tag on the boundary into two pieces:

Here is a post that produces this behavior.