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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Nested calc (e.g. calc(calc(x))) doesn't work"
   href="https://bugs.webkit.org/show_bug.cgi?id=166493">166493</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Nested calc (e.g. calc(calc(x))) doesn't work
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>Safari 10
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>CSS
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>oliverjash&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When nesting occurs in the CSS calc function, WebKit fails to calculate the result.

Example (works in Chrome, empty in Safari): <a href="http://jsbin.com/tonova/10/edit?html,css,output">http://jsbin.com/tonova/10/edit?html,css,output</a>

This is quite common when using CSS variables, e.g. <a href="http://jsbin.com/tonova/11/edit?html,css,output">http://jsbin.com/tonova/11/edit?html,css,output</a>

There could be some overlap here with issue <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Nested calculations using intermediate CSS Custom Properties don't work"
   href="show_bug.cgi?id=161002">https://bugs.webkit.org/show_bug.cgi?id=161002</a></pre>
        </div>
      </p>
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