Inserts all of the nodes into this node directly before refChild.
See also:
Node insertAllBefore(Iterable<Node> newNodes, Node refChild) { if (newNodes is _ChildNodeListLazy) { _ChildNodeListLazy otherList = newNodes; if (identical(otherList._this, this)) { throw new ArgumentError(newNodes); } // Optimized route for copying between nodes. for (var i = 0, len = otherList.length; i < len; ++i) { this.insertBefore(otherList._this.firstChild, refChild); } } else { for (var node in newNodes) { this.insertBefore(node, refChild); } } }
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https://api.dart.dev/stable/2.5.0/dart-html/Node/insertAllBefore.html