title: Cannot understand JavaScript instruction
body: <p>I am interested in the <a href="https://github.com/atstp/wasabi" rel="nofollow noreferrer">Wasabi</a> tool.
  Please have a look on <a href="https://github.com/atstp/wasabi#in-a-browser" rel="nofollow noreferrer">this piece of code</a>.</p>
  <p>I don't understand this instruction:</p>
  <pre><code>var W = window.Wasabi = window.Wasabi || {};
  </code></pre>
  <p>My final purpose is to adjust a CSS property, dynamically loaded by the JavaScript...</p>
  <p>Thanks for the help.</p>