diff --git a/src/browser/dom/nodelist.zig b/src/browser/dom/nodelist.zig
index 56194c2fa..22e8708fe 100644
--- a/src/browser/dom/nodelist.zig
+++ b/src/browser/dom/nodelist.zig
@@ -110,7 +110,7 @@ pub const NodeList = struct {
         try self.nodes.append(alloc, node);
     }
 
-    pub fn get_length(self: *NodeList) u32 {
+    pub fn get_length(self: *const NodeList) u32 {
         return @intCast(self.nodes.items.len);
     }
 
diff --git a/src/browser/html/elements.zig b/src/browser/html/elements.zig
index 5be01a1e4..57d2fa298 100644
--- a/src/browser/html/elements.zig
+++ b/src/browser/html/elements.zig
@@ -61,7 +61,6 @@ pub const Interfaces = .{
     HTMLHeadElement,
     HTMLHeadingElement,
     HTMLHtmlElement,
-    HTMLIFrameElement,
     HTMLImageElement,
     HTMLImageElement.Factory,
     HTMLInputElement,
@@ -102,6 +101,7 @@ pub const Interfaces = .{
     HTMLVideoElement,
 
     @import("form.zig").HTMLFormElement,
+    @import("iframe.zig").HTMLIFrameElement,
     @import("select.zig").Interfaces,
 };
 
@@ -584,12 +584,6 @@ pub const HTMLHtmlElement = struct {
     pub const subtype = .node;
 };
 
-pub const HTMLIFrameElement = struct {
-    pub const Self = parser.IFrame;
-    pub const prototype = *HTMLElement;
-    pub const subtype = .node;
-};
-
 pub const HTMLImageElement = struct {
     pub const Self = parser.Image;
     pub const prototype = *HTMLElement;
diff --git a/src/browser/html/iframe.zig b/src/browser/html/iframe.zig
new file mode 100644
index 000000000..f8edf5080
--- /dev/null
+++ b/src/browser/html/iframe.zig
@@ -0,0 +1,30 @@
+// Copyright (C) 2023-2025  Lightpanda (Selecy SAS)
+//
+// Francis Bouvier <francis@lightpanda.io>
+// Pierre Tachoire <pierre@lightpanda.io>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+
+const parser = @import("../netsurf.zig");
+const Page = @import("../page.zig").Page;
+const HTMLElement = @import("elements.zig").HTMLElement;
+
+// https://html.spec.whatwg.org/multipage/iframe-embed-object.html#htmliframeelement
+pub const HTMLIFrameElement = struct {
+    pub const Self = parser.IFrame;
+    pub const prototype = *HTMLElement;
+    pub const subtype = .node;
+};
diff --git a/src/browser/html/window.zig b/src/browser/html/window.zig
index b1aedf513..d85269da5 100644
--- a/src/browser/html/window.zig
+++ b/src/browser/html/window.zig
@@ -34,6 +34,7 @@ const MediaQueryList = @import("media_query_list.zig").MediaQueryList;
 const Performance = @import("../dom/performance.zig").Performance;
 const CSSStyleDeclaration = @import("../cssom/CSSStyleDeclaration.zig");
 const Screen = @import("screen.zig").Screen;
+const domcss = @import("../dom/css.zig");
 const Css = @import("../css/css.zig").Css;
 
 const Function = Env.Function;
@@ -127,7 +128,43 @@ pub const Window = struct {
         return self;
     }
 
-    // TODO: frames
+    // frames return the window itself, but accessing it via a pseudo
+    // array returns the Window object corresponding to the given frame or
+    // iframe.
+    // https://developer.mozilla.org/en-US/docs/Web/API/Window/frames
+    pub fn get_frames(self: *Window) *Window {
+        return self;
+    }
+
+    pub fn indexed_get(self: *Window, index: u32, has_value: *bool, page: *Page) !*Window {
+        const frames = try domcss.querySelectorAll(
+            page.call_arena,
+            parser.documentHTMLToNode(self.document),
+            "iframe",
+        );
+
+        if (index >= frames.nodes.items.len) {
+            has_value.* = false;
+            return undefined;
+        }
+
+        has_value.* = true;
+        // TODO return the correct frame's window
+        // frames.nodes.items[indexed]
+        return error.TODO;
+    }
+
+    // Retrieve the numbre of frames/iframes from the DOM dynamically.
+    pub fn get_length(self: *const Window, page: *Page) !u32 {
+        const frames = try domcss.querySelectorAll(
+            page.call_arena,
+            parser.documentHTMLToNode(self.document),
+            "iframe",
+        );
+
+        return frames.get_length();
+    }
+
     pub fn get_top(self: *Window) *Window {
         return self;
     }
@@ -504,6 +541,14 @@ test "Browser.HTML.Window" {
         .{ "scrollend", "true" },
     }, .{});
 
+    try runner.testCases(&.{
+        .{ "window == window.self", "true" },
+        .{ "window == window.parent", "true" },
+        .{ "window == window.top", "true" },
+        .{ "window == window.frames", "true" },
+        .{ "window.frames.length", "0" },
+    }, .{});
+
     try runner.testCases(&.{
         .{ "var qm = false; window.queueMicrotask(() => {qm = true });", null },
         .{ "qm", "true" },
@@ -526,3 +571,26 @@ test "Browser.HTML.Window" {
         }, .{});
     }
 }
+
+test "Browser.HTML.Window.frames" {
+    var runner = try testing.jsRunner(testing.tracking_allocator, .{ .html = 
+        \\<body>
+        \\ <iframe
+        \\   src="https://httpbin.io/html"
+        \\   title="iframea">
+        \\ </iframe>
+        \\ <iframe
+        \\   src="https://httpbin.io/html"
+        \\   title="iframeb">
+        \\ </iframe>
+        \\</body>
+    });
+
+    defer runner.deinit();
+
+    try runner.testCases(&.{
+        .{ "frames.length", "2" },
+        .{ "try { frames[1] } catch (e) { e }", "Error: TODO" }, // TODO fixme
+        .{ "frames[3]", "undefined" },
+    }, .{});
+}