="attributes">&lt;optional><br></td><td class="default"></td><td class="description last"><p>Root element to attach to, the document body by default</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="src_engine.js.html">src/engine.js</a>, <a href="src_engine.js.html#line115">line 115</a></li></ul></dd></div></dl><h3 class="name has-anchor" id=".engineObjectsCallback"><span class="type-signa