element.firstChild is returning ‘

by

You should skip the TextNodes, a simple function can help you:

function getFirstChild(el){
  var firstChild = el.firstChild;
  while(firstChild != null && firstChild.nodeType == 3){ // skip TextNodes
    firstChild = firstChild.nextSibling;
  }
  return firstChild;
}

Usage:

var tabContainer = document.getElementById(TabContainer);
var tabs = getFirstChild(tabContainer);

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