title: CSS3 calc() validation: Value Error : width Parse Error
body: <p>I need to validate a CSS3 file where I'm using the following code:</p>
  
  <pre><code>width:calc(96.3% - 312px)
  </code></pre>
  
  <p>It returns this error:</p>
  
  <blockquote>
    <p>Value Error : width Parse Error - 312px)</p>
  </blockquote>
  
  <p>My last choice is to use a Javascript function on page load and window resize to get the width value when it's possible using CSS3 (only for IE8 or older).</p>