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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 - position: sticky shouldn't create a stacking context"
   href="https://bugs.webkit.org/show_bug.cgi?id=168725">168725</a>
          </td>
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        <tr>
          <th>Summary</th>
          <td>position: sticky shouldn't create a stacking context
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>Safari 9
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </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>Layout and Rendering
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>flackr&#64;chromium.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bfulgham&#64;webkit.org, simon.fraser&#64;apple.com, zalan&#64;apple.com
          </td>
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      <p>
        <div>
        <pre>As far as I can tell from reading <a href="https://drafts.csswg.org/css2/visuren.html#z-index">https://drafts.csswg.org/css2/visuren.html#z-index</a> only position fixed implicitly creates a stacking context.

Loading <a href="http://output.jsbin.com/yucorey">http://output.jsbin.com/yucorey</a> shows an example page which demonstrates that currently sticky is creating a stacking context (i.e. the z-index 2 descendant is stacked below the z-index 1 sibling.</pre>
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      </p>
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