diff --git a/src/dom/document.zig b/src/dom/document.zig
index b5e57a10..831ad81d 100644
--- a/src/dom/document.zig
+++ b/src/dom/document.zig
@@ -36,6 +36,11 @@ pub const Document = struct {
         return Element.toInterface(e);
     }
 
+    pub fn _createElementNS(self: *parser.Document, ns: []const u8, tag_name: []const u8) ElementUnion {
+        const e = parser.documentCreateElementNS(self, ns, tag_name);
+        return Element.toInterface(e);
+    }
+
     // We can't simply use libdom dom_document_get_elements_by_tag_name here.
     // Indeed, netsurf implemented a previous dom spec when
     // getElementsByTagName returned a NodeList.
@@ -51,6 +56,16 @@ pub const Document = struct {
             .match = tag_name,
         };
     }
+
+    // TODO implement the filter by namespace
+    pub fn _getElementsByTagNameNS(self: *parser.Document, namespace: []const u8, localname: []const u8) HTMLCollection {
+        _ = namespace;
+        const root = parser.documentGetDocumentNode(self);
+        return HTMLCollection{
+            .root = root,
+            .match = localname,
+        };
+    }
 };
 
 // Tests
@@ -88,6 +103,14 @@ pub fn testExecFn(
     };
     try checkCases(js_env, &getElementsByTagName);
 
+    var getElementsByTagNameNS = [_]Case{
+        .{ .src = "let a = document.getElementsByTagNameNS('', 'p')", .ex = "undefined" },
+        .{ .src = "a.length", .ex = "2" },
+        .{ .src = "let b = document.getElementsByTagNameNS(null, 'p')", .ex = "undefined" },
+        .{ .src = "b.length", .ex = "2" },
+    };
+    try checkCases(js_env, &getElementsByTagNameNS);
+
     const tags = comptime parser.Tag.all();
     comptime var createElements: [(tags.len) * 2]Case = undefined;
     inline for (tags, 0..) |tag, i| {
diff --git a/src/netsurf.zig b/src/netsurf.zig
index 992b8e46..f9126450 100644
--- a/src/netsurf.zig
+++ b/src/netsurf.zig
@@ -752,6 +752,12 @@ pub inline fn documentCreateElement(doc: *Document, tag_name: []const u8) *Eleme
     return elem.?;
 }
 
+pub inline fn documentCreateElementNS(doc: *Document, ns: []const u8, tag_name: []const u8) *Element {
+    var elem: ?*Element = undefined;
+    _ = documentVtable(doc).dom_document_create_element_ns.?(doc, stringFromData(ns), stringFromData(tag_name), &elem);
+    return elem.?;
+}
+
 // DocumentHTML
 pub const DocumentHTML = c.dom_html_document;