title: How to parametrize the host in style content references?
body: <p>What is the simplest way to set a parametric host in one or several CSS style sheets, for static content like images?</p>
  
  <p>By <em>parametric host</em>, i mean having the host define somewhere else, while the path is standing, so that the host definition can be changed for different levels of deployment.</p>
  
  <p>While this is trivial to do for javascript included images, and while a <code>&lt;base&gt;</code> url is provided for HTML, i don't know how to achieve the same result with style assets.</p>
  
  <p>Notes:</p>
  
  <ul>
  <li>the question is about standard CSS, without preprocessors</li>
  <li>using relative paths will not work, since the style sheets need to be loaded from different domains</li>
  </ul>