diff --git a/src/browser/js/bridge.zig b/src/browser/js/bridge.zig
index 38226456..4a313b6b 100644
--- a/src/browser/js/bridge.zig
+++ b/src/browser/js/bridge.zig
@@ -447,6 +447,7 @@ pub const JsApis = flattenTypes(&.{
     @import("../webapi/Document.zig"),
     @import("../webapi/HTMLDocument.zig"),
     @import("../webapi/History.zig"),
+    @import("../webapi/intl/Intl.zig"),
     @import("../webapi/KeyValueList.zig"),
     @import("../webapi/DocumentFragment.zig"),
     @import("../webapi/DocumentType.zig"),
@@ -458,6 +459,7 @@ pub const JsApis = flattenTypes(&.{
     @import("../webapi/Element.zig"),
     @import("../webapi/element/Attribute.zig"),
     @import("../webapi/element/Html.zig"),
+    @import("../webapi/element/html/IFrame.zig"),
     @import("../webapi/element/html/Anchor.zig"),
     @import("../webapi/element/html/Body.zig"),
     @import("../webapi/element/html/BR.zig"),
diff --git a/src/browser/tests/document/document.html b/src/browser/tests/document/document.html
index 4241293a..5b2e4000 100644
--- a/src/browser/tests/document/document.html
+++ b/src/browser/tests/document/document.html
@@ -11,6 +11,7 @@
   testing.expectEqual(null, document.parentNode);
   testing.expectEqual(undefined, document.getCurrentScript);
   testing.expectEqual("http://127.0.0.1:9582/src/browser/tests/document/document.html", document.URL);
+  testing.expectEqual(window, document.defaultView);
 </script>
 
 <script id=headAndbody>
diff --git a/src/browser/webapi/Document.zig b/src/browser/webapi/Document.zig
index d255542f..70a40767 100644
--- a/src/browser/webapi/Document.zig
+++ b/src/browser/webapi/Document.zig
@@ -195,6 +195,11 @@ pub const JsApi = struct {
     pub const querySelectorAll = bridge.function(Document.querySelectorAll, .{ .dom_exception = true });
     pub const getElementsByTagName = bridge.function(Document.getElementsByTagName, .{});
     pub const getElementsByClassName = bridge.function(Document.getElementsByClassName, .{});
+    pub const defaultView = bridge.accessor(struct{
+        fn defaultView(_: *const Document, page: *Page) *@import("Window.zig") {
+            return page.window;
+        }
+    }.defaultView, null, .{.cache = "defaultView"});
 };
 
 const testing = @import("../../testing.zig");
diff --git a/src/browser/webapi/Element.zig b/src/browser/webapi/Element.zig
index e6fca509..e0089076 100644
--- a/src/browser/webapi/Element.zig
+++ b/src/browser/webapi/Element.zig
@@ -107,6 +107,7 @@ pub fn getTagNameLower(self: *const Element) []const u8 {
                 .head => "head",
                 .html => "html",
                 .hr => "hr",
+                .iframe => "iframe",
                 .img => "img",
                 .input => "input",
                 .li => "li",
@@ -148,6 +149,7 @@ pub fn getTagNameSpec(self: *const Element, buf: []u8) []const u8 {
                 .head => "HEAD",
                 .html => "HTML",
                 .hr => "HR",
+                .iframe => "IFRAME",
                 .img => "IMG",
                 .input => "INPUT",
                 .li => "LI",
@@ -522,6 +524,7 @@ pub fn getTag(self: *const Element) Tag {
             .form => .form,
             .p => .p,
             .custom => .custom,
+            .iframe => .iframe,
             .img => .img,
             .br => .br,
             .button => .button,
@@ -577,6 +580,7 @@ pub const Tag = enum {
     hr,
     html,
     i,
+    iframe,
     img,
     input,
     li,
diff --git a/src/browser/webapi/Window.zig b/src/browser/webapi/Window.zig
index 944ea860..d5261fed 100644
--- a/src/browser/webapi/Window.zig
+++ b/src/browser/webapi/Window.zig
@@ -6,6 +6,7 @@ const log = @import("../../log.zig");
 const Page = @import("../Page.zig");
 const Console = @import("Console.zig");
 const History = @import("History.zig");
+const Intl = @import("intl/Intl.zig");
 const Navigator = @import("Navigator.zig");
 const Document = @import("Document.zig");
 const Location = @import("Location.zig");
@@ -52,6 +53,10 @@ pub fn getNavigator(_: *const Window) Navigator {
     return .{};
 }
 
+pub fn getIntl(_: *const Window) Intl {
+    return .{};
+}
+
 pub fn getLocalStorage(self: *const Window) *storage.Lookup {
     return &self._storage_bucket.local;
 }
@@ -266,6 +271,7 @@ pub const JsApi = struct {
     pub const parent = bridge.accessor(Window.getWindow, null, .{ .cache = "parent" });
     pub const console = bridge.accessor(Window.getConsole, null, .{ .cache = "console" });
     pub const navigator = bridge.accessor(Window.getNavigator, null, .{ .cache = "navigator" });
+    pub const Intl = bridge.accessor(Window.getIntl, null, .{ .cache = "Intl" });
     pub const localStorage = bridge.accessor(Window.getLocalStorage, null, .{ .cache = "localStorage" });
     pub const sessionStorage = bridge.accessor(Window.getSessionStorage, null, .{ .cache = "sessionStorage" });
     pub const document = bridge.accessor(Window.getDocument, null, .{ .cache = "document" });
diff --git a/src/browser/webapi/element/Html.zig b/src/browser/webapi/element/Html.zig
index ed2a95c2..c16b539d 100644
--- a/src/browser/webapi/element/Html.zig
+++ b/src/browser/webapi/element/Html.zig
@@ -31,6 +31,7 @@ pub const TextArea = @import("html/TextArea.zig");
 pub const Paragraph = @import("html/Paragraph.zig");
 pub const Select = @import("html/Select.zig");
 pub const Option = @import("html/Option.zig");
+pub const IFrame = @import("html/IFrame.zig");
 
 const HtmlElement = @This();
 
@@ -51,6 +52,7 @@ pub const Type = union(enum) {
     html: Html,
     hr: HR,
     img: Image,
+    iframe: IFrame,
     input: *Input,
     li: LI,
     link: Link,
@@ -89,6 +91,7 @@ pub fn className(self: *const HtmlElement) []const u8 {
         .p => "[object HtmlParagraphElement]",
         .custom => "[object CUSTOM-TODO]",
         .img => "[object HTMLImageElement]",
+        .iframe => "[object HTMLIFrameElement]",
         .br => "[object HTMLBRElement]",
         .button => "[object HTMLButtonElement]",
         .heading => "[object HTMLHeadingElement]",
diff --git a/src/browser/webapi/element/html/IFrame.zig b/src/browser/webapi/element/html/IFrame.zig
new file mode 100644
index 00000000..a9267666
--- /dev/null
+++ b/src/browser/webapi/element/html/IFrame.zig
@@ -0,0 +1,24 @@
+const js = @import("../../../js/js.zig");
+const Node = @import("../../Node.zig");
+const Element = @import("../../Element.zig");
+const HtmlElement = @import("../Html.zig");
+
+const IFrame = @This();
+_proto: *HtmlElement,
+
+pub fn asElement(self: *IFrame) *Element {
+    return self._proto._proto;
+}
+pub fn asNode(self: *IFrame) *Node {
+    return self.asElement().asNode();
+}
+
+pub const JsApi = struct {
+    pub const bridge = js.Bridge(IFrame);
+
+    pub const Meta = struct {
+        pub const name = "HTMLIFrameElement";
+        pub const prototype_chain = bridge.prototypeChain();
+        pub var class_id: bridge.ClassId = undefined;
+    };
+};
diff --git a/src/browser/webapi/intl/Intl.zig b/src/browser/webapi/intl/Intl.zig
new file mode 100644
index 00000000..4015d478
--- /dev/null
+++ b/src/browser/webapi/intl/Intl.zig
@@ -0,0 +1,20 @@
+const std = @import("std");
+const js = @import("../../js/js.zig");
+
+const Intl = @This();
+
+// Skeleton implementation with no actual functionality yet.
+// This allows `if (Intl)` checks to pass, while property checks
+// like `if (Intl.Locale)` will return undefined.
+// We can add actual implementations as we encounter real-world use cases.
+
+pub const JsApi = struct {
+    pub const bridge = js.Bridge(Intl);
+
+    pub const Meta = struct {
+        pub const name = "Intl";
+        pub var class_id: bridge.ClassId = undefined;
+        pub const prototype_chain = bridge.prototypeChain();
+        pub const empty_with_no_proto = true;
+    };
+};