erty-type"><span class="qm-api-type">HTMLElement</span></span></span><span class="qm-api-header-tags"></span></div></div></div></div><div class="qm-api-collapsible-content"><div class="qm-api-item-content"><div class="qm-api-description"><div class="qm-html-paragraph">The  <code class="qm-code-highlight-code qm-code-font">th</code>  node of the top left cell. Values entered in this cell will affect the sizes of the left&#x2F;top headings. </div></div></div></div></div></div></div></div></div><div class="qm-