Add trailing slash to taxonomy term. Issue with relative URL
The key to this answere is that the URL needs to end with a slash. 

I turns out Redirect modules will remove trailing slashes. 

You can disable clean URLs if you want trailing slash. Which is not ideal. 

A workaround would be to use this code for particular links: 

&lt;p&gt;&lt;a href="home" id="relurl" target="_blank" title="This is a relative link!"&gt;link&lt;/a&gt;


var x = window.location.href; // Current page URL
var link = document.getElementById("relurl"); // store the element
var curHref = link.getAttribute('href'); // Get HREF paramter
link.setAttribute('href', x + "/"+ curHref);