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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Implement &#64;counter-style"
   href="https://bugs.webkit.org/show_bug.cgi?id=167645">167645</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Implement &#64;counter-style
          </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>Unspecified
          </td>
        </tr>

        <tr>
          <th>URL</th>
          <td>data:text/html,&lt;style&gt;&#64;counter-style negplus { system: numeric; symbols: '-' '+'; } ol { list-style: negplus }&lt;/style&gt;&lt;ol&gt;&lt;li&gt;1&lt;/li&gt;&lt;li&gt;2&lt;/li&gt;&lt;/ol&gt;
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </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>ebraminio&#64;gmail.com
          </td>
        </tr></table>
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        <div>
        <pre>Related w3 document:
<a href="https://www.w3.org/TR/css-counter-styles-3/">https://www.w3.org/TR/css-counter-styles-3/</a>

To repro:
data:text/html,&lt;style&gt;&#64;counter-style negplus { system: numeric; symbols: '-' '+'; } ol { list-style: negplus }&lt;/style&gt;&lt;ol&gt;&lt;li&gt;1&lt;/li&gt;&lt;li&gt;2&lt;/li&gt;&lt;/ol&gt;

Expected:
Like Firefox, you should see something like:
 +. 1
+-. 2

Actual:
Whole &#64;counter-style is not supported it seems.</pre>
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