title: Firefox renders table incorrect with multiple rowspan and colspan
body: <p>The following code works well in Chrome and IE, but does not working in Firefox.</p>
  
  <p>The <code>table</code> is generated dynamically and <code>tr</code>/<code>td</code> can't be removed from the following example</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.widget-table-container,
  tr td {
    border: 1px solid red;
  }
  .widget {
    border: 1px solid green;
    margin: 0px;
    padding: 0px;
    background-color: #ffffff;
    border-radius: 5px;
    overflow: hidden;
    height: 100%;
    width: 100%;
    left: 1px;
    top: 1px;
    bottom: 0px;
    right: 0px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;table class="widget-table-container"&gt;
    &lt;tbody&gt;
      &lt;tr&gt;
        &lt;td colspan="2" rowspan="2" style="width: 378px; height: 378px;"&gt;
          &lt;div class="widget" style="width: 371px; height: 371px; background-color:lightblue;"&gt;
            &lt;div class="widget-title"&gt;
              &lt;p&gt;Title&lt;/p&gt;
            &lt;/div&gt;
            &lt;div class="widget-body"&gt;&lt;/div&gt;
          &lt;/div&gt;
        &lt;/td&gt;
        &lt;td colspan="8" rowspan="4" style="width: 1512px; height: 756px;"&gt;
          &lt;div class="widget" style="width: 1493px; height: 745px;"&gt;
            &lt;div class="widget-title"&gt;Title CPU&lt;/p&gt;
            &lt;/div&gt;
            &lt;div class="widget-body"&gt;BODY&lt;/div&gt;
          &lt;/div&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
      &lt;tr&gt;
      &lt;/tr&gt;
      &lt;tr&gt;
        &lt;td colspan="2" rowspan="2" style="width: 378px; height: 378px;"&gt;
          &lt;div class="widget" style="width: 371px; height: 371px;"&gt;
            &lt;div class="widget-title"&gt;
              &lt;p&gt;Some Title&lt;/p&gt;
            &lt;/div&gt;
            &lt;div class="widget-body"&gt;&lt;/div&gt;
          &lt;/div&gt;
        &lt;/td&gt;
      &lt;/tr&gt;
      &lt;tr&gt;&lt;/tr&gt;
    &lt;/tbody&gt;
  &lt;/table&gt;</code></pre>
  </div>
  </div>
  </p>