title: Selenium IDE decrement value of var
body: <p>Hi I'm trying to do a simple decrement in Selenium but it isn't returning the subtraction, instead of it is returning a string. Follow my code:</p>
  
  <pre><code>&lt;tr&gt;
      &lt;td&gt;store&lt;/td&gt;
      &lt;td&gt;2&lt;/td&gt;
      &lt;td&gt;contador&lt;/td&gt;
  &lt;/tr&gt;
  
  &lt;tr&gt;
      &lt;td&gt;store&lt;/td&gt;
      &lt;td&gt;${contador}--&lt;/td&gt;
      &lt;td&gt;contador&lt;/td&gt;
  &lt;/tr&gt;
  
  &lt;tr&gt;
      &lt;td&gt;echo&lt;/td&gt;
      &lt;td&gt;${contador}&lt;/td&gt;
      &lt;td&gt;&lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>Expected: 1</p>
  
  <p>But get: 2--</p>