Link Wrench is a WordPress plugin that adds a span with class=”insidelink” inside your links. I wrote it to deliver the effect we wanted for the links on StrawberryCat.com.
The plugin is available under the GNU GPLv3 license. You may clone, download or fork it on GitHub. The WordPress.org page for the plugin is here.
As an example of what can be done with this plugin, on StrawberryCat.com we style the links with:
And style the insidelink class with:
The result is this:
Here is a link to StrawberryCat’s site, styled in the manner I describe above.