throws DOMException { return internalInsertBefore(newChild, refChild, false);
internalInsertBefore(newChild, oldChild, true); if (newChild != oldChild) { internalRemoveChild(oldChild, true);
throws DOMException { return internalInsertBefore(newChild, refChild, false);
internalInsertBefore(newChild, oldChild, true); if (newChild != oldChild) { internalRemoveChild(oldChild, true);