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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 - Flex box container: some items do not render if added dynamically"
   href="https://bugs.webkit.org/show_bug.cgi?id=160551">160551</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Flex box container:  some items do not render if added dynamically
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>OS X 10.11
          </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>jeanfelixg&#64;gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>simon.fraser&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=285325" name="attach_285325" title="Sample to reproduce the issue.">attachment 285325</a> <a href="attachment.cgi?id=285325&amp;action=edit" title="Sample to reproduce the issue.">[details]</a></span>
Sample to reproduce the issue.

Webkit nightly and Safari tech preview both have the issue.

When adding HTML dynamically into a flex box containers, some of the elements are not painted. 
A page resize is needed to reveal all its content.  Mouse hover reveals the underlaying elements.

I extracted a sample from an app im working on...  I used a setTimeout to simulate an XHR request for dynamic HTML content.

So, in the sample, there are flex containers inside other flex container (which have other elements that i removed for brevity) and it adds the dynamic content in &quot;#jsSectionContentsimpleList57a33a09696da&quot;. The dynamic content is also a flex box container with both a section (blue) and a footer (green).

Open flex_draw.html from the zip to have a look.


P.S. Chrome, FF, IE11, Edge render it without issue.

Thanks!</pre>
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