domdocument first child element code example
Example: how to add first child using js
var eElement; // some E DOM instance
var newFirstElement; //element which should be first in E
eElement.insertBefore(newFirstElement, eElement.firstChild);
var eElement; // some E DOM instance
var newFirstElement; //element which should be first in E
eElement.insertBefore(newFirstElement, eElement.firstChild);