js insert element as first child code example
Example 1: javascript append how first element
// 2018+ Version
parentElement.prepend(newFirstChild)
Example 2: 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);
Example 3: append element in a div as first child
ParentNode.insertBefore(<your element>, ParentNode.firstChild);