diff --git a/src/dom/document.zig b/src/dom/document.zig
index 9c878871..47582f6b 100644
--- a/src/dom/document.zig
+++ b/src/dom/document.zig
@@ -5,6 +5,7 @@ const parser = @import("../netsurf.zig");
 const jsruntime = @import("jsruntime");
 const Case = jsruntime.test_utils.Case;
 const checkCases = jsruntime.test_utils.checkCases;
+const Variadic = jsruntime.Variadic;
 
 const Node = @import("node.zig").Node;
 const NodeList = @import("nodelist.zig").NodeList;
@@ -228,6 +229,28 @@ pub const Document = struct {
         return list;
     }
 
+    // TODO according with https://dom.spec.whatwg.org/#parentnode, the
+    // function must accept either node or string.
+    // blocked by https://github.com/lightpanda-io/jsruntime-lib/issues/114
+    pub fn _prepend(_: *parser.Document, _: ?Variadic(*parser.Node)) !void {
+        return parser.DOMError.HierarchyRequest;
+    }
+
+    // TODO according with https://dom.spec.whatwg.org/#parentnode, the
+    // function must accept either node or string.
+    // blocked by https://github.com/lightpanda-io/jsruntime-lib/issues/114
+    pub fn _append(_: *parser.Document, _: ?Variadic(*parser.Node)) !void {
+        return parser.DOMError.HierarchyRequest;
+    }
+
+    // TODO according with https://dom.spec.whatwg.org/#parentnode, the
+    // function must accept either node or string.
+    // blocked by https://github.com/lightpanda-io/jsruntime-lib/issues/114
+    pub fn _replaceChildren(_: *parser.Document, _: ?Variadic(*parser.Node)) !void {
+        // TODO implement function correctly
+        return parser.DOMError.HierarchyRequest;
+    }
+
     pub fn deinit(_: *parser.Document, _: std.mem.Allocator) void {}
 };
 
diff --git a/src/dom/element.zig b/src/dom/element.zig
index 43000655..47d42b05 100644
--- a/src/dom/element.zig
+++ b/src/dom/element.zig
@@ -299,7 +299,7 @@ pub const Element = struct {
         }
 
         for (nodes.?.slice) |node| {
-            _ = try parser.nodeInsertBefore(nself, first.?, node);
+            _ = try parser.nodeInsertBefore(nself, node, first.?);
         }
     }
 
@@ -319,8 +319,8 @@ pub const Element = struct {
     // function must accept either node or string.
     // blocked by https://github.com/lightpanda-io/jsruntime-lib/issues/114
     pub fn _replaceChildren(self: *parser.Element, nodes: ?Variadic(*parser.Node)) !void {
-        // if (nodes == null) return;
-        // if (nodes.?.slice.len == 0) return;
+        if (nodes == null) return;
+        if (nodes.?.slice.len == 0) return;
 
         const nself = parser.elementToNode(self);