diff --git a/src/browser/tests/element/inner.html b/src/browser/tests/element/inner.html
index b8023122..c9bb0894 100644
--- a/src/browser/tests/element/inner.html
+++ b/src/browser/tests/element/inner.html
@@ -143,7 +143,6 @@
   // innerText does NOT parse HTML (unlike innerHTML)
   d1.innerText = 'hello <div>world</div><b>!!</b>';
   testing.expectEqual('hello <div>world</div><b>!!</b>', d1.innerText);
-  console.warn(d1.innerHTML);
   testing.expectEqual('hello &lt;div&gt;world&lt;/div&gt;&lt;b&gt;!!&lt;/b&gt;', d1.innerHTML);
 
   // Setting empty string clears children
diff --git a/src/browser/tests/net/headers.html b/src/browser/tests/net/headers.html
index d0d1c35e..07e96725 100644
--- a/src/browser/tests/net/headers.html
+++ b/src/browser/tests/net/headers.html
@@ -17,15 +17,145 @@
   testing.expectEqual(null, headers.get('Content-Type'));
   testing.expectEqual(false, headers.has('Content-Type'));
 }
+</script>
 
+<script id=case-insensitive>
+// Headers should be case-insensitive per HTTP spec
+{
+  const headers = new Headers();
+
+  // Set with one case, get with another
+  headers.set('Content-Type', 'application/json');
+  testing.expectEqual('application/json', headers.get('content-type'));
+  testing.expectEqual('application/json', headers.get('CONTENT-TYPE'));
+  testing.expectEqual('application/json', headers.get('Content-Type'));
+
+  // has should be case-insensitive
+  testing.expectEqual(true, headers.has('content-type'));
+  testing.expectEqual(true, headers.has('CONTENT-TYPE'));
+  testing.expectEqual(true, headers.has('Content-Type'));
+
+  // delete should be case-insensitive
+  headers.delete('CONTENT-TYPE');
+  testing.expectEqual(false, headers.has('content-type'));
+  testing.expectEqual(false, headers.has('Content-Type'));
+}
+
+{
+  const headers = new Headers();
+
+  // Append with different cases - should all be treated as same header
+  headers.append('Accept', 'application/json');
+  headers.append('ACCEPT', 'text/html');
+  headers.append('accept', 'text/plain');
+
+  // Verify all values are present using iteration
+  const values = Array.from(headers.values());
+  testing.expectEqual(3, values.length);
+  testing.expectEqual('application/json', values[0]);
+  testing.expectEqual('text/html', values[1]);
+  testing.expectEqual('text/plain', values[2]);
+}
+
+{
+  const headers = new Headers();
+
+  // Set should replace regardless of case
+  headers.set('Authorization', 'Bearer token1');
+  headers.set('AUTHORIZATION', 'Bearer token2');
+
+  testing.expectEqual('Bearer token2', headers.get('authorization'));
+
+  // Should only have one entry after set replaces
+  const entries = Array.from(headers.entries());
+  testing.expectEqual(1, entries.length);
+  testing.expectEqual('authorization', entries[0][0]);
+  testing.expectEqual('Bearer token2', entries[0][1]);
+}
+</script>
+
+<script id=iterators>
+// Test keys(), values(), entries() iterators
+{
+  const headers = new Headers();
+  headers.set('Content-Type', 'application/json');
+  headers.set('Authorization', 'Bearer token123');
+  headers.set('X-Custom', 'test-value');
+
+  // Test keys()
+  const keys = Array.from(headers.keys());
+  testing.expectEqual(3, keys.length);
+  testing.expectEqual('content-type', keys[0]);
+  testing.expectEqual('authorization', keys[1]);
+  testing.expectEqual('x-custom', keys[2]);
+
+  // Test values()
+  const values = Array.from(headers.values());
+  testing.expectEqual(3, values.length);
+  testing.expectEqual('application/json', values[0]);
+  testing.expectEqual('Bearer token123', values[1]);
+  testing.expectEqual('test-value', values[2]);
+
+  // Test entries()
+  const entries = Array.from(headers.entries());
+  testing.expectEqual(3, entries.length);
+  testing.expectEqual('content-type', entries[0][0]);
+  testing.expectEqual('application/json', entries[0][1]);
+  testing.expectEqual('authorization', entries[1][0]);
+  testing.expectEqual('Bearer token123', entries[1][1]);
+  testing.expectEqual('x-custom', entries[2][0]);
+  testing.expectEqual('test-value', entries[2][1]);
+}
+
+// Test forEach()
+{
+  const headers = new Headers();
+  headers.set('Content-Type', 'application/json');
+  headers.set('Authorization', 'Bearer token123');
+
+  const collected = [];
+  headers.forEach(function(value, name, headersObj) {
+    collected.push([name, value]);
+    testing.expectEqual(headers, headersObj);
+  });
+
+  testing.expectEqual(2, collected.length);
+  testing.expectEqual('content-type', collected[0][0]);
+  testing.expectEqual('application/json', collected[0][1]);
+  testing.expectEqual('authorization', collected[1][0]);
+  testing.expectEqual('Bearer token123', collected[1][1]);
+}
+
+// Test forEach with thisArg
+{
+  const headers = new Headers();
+  headers.set('X-Test', 'value');
+
+  const context = { count: 0 };
+  headers.forEach(function() {
+    this.count++;
+  }, context);
+
+  testing.expectEqual(1, context.count);
+}
+
+// Test multiple values for same header using append
 {
   const headers = new Headers();
   headers.append('Accept', 'application/json');
   headers.append('Accept', 'text/html');
+  headers.append('Accept', 'text/plain');
 
-  const all = headers.getAll('Accept');
-  testing.expectEqual(2, all.length);
-  testing.expectEqual('application/json', all[0]);
-  testing.expectEqual('text/html', all[1]);
+  const values = [];
+  headers.forEach((value, name) => {
+    if (name === 'accept') {
+      values.push(value);
+    }
+  });
+
+  testing.expectEqual(3, values.length);
+  testing.expectEqual('application/json', values[0]);
+  testing.expectEqual('text/html', values[1]);
+  testing.expectEqual('text/plain', values[2]);
 }
 </script>
diff --git a/src/browser/webapi/collections/NodeList.zig b/src/browser/webapi/collections/NodeList.zig
index 0e4a3c2e..dae61509 100644
--- a/src/browser/webapi/collections/NodeList.zig
+++ b/src/browser/webapi/collections/NodeList.zig
@@ -75,7 +75,7 @@ pub fn forEach(self: *NodeList, cb: js.Function, page: *Page) !void {
 
         var result: js.Function.Result = undefined;
         cb.tryCall(void, .{ next.value, i, self }, &result) catch {
-            log.debug(.js, "forEach callback", .{ .err = result.exception, .stack = result.stack });
+            log.debug(.js, "forEach callback", .{ .err = result.exception, .stack = result.stack, .source = "nodelist" });
             return;
         };
     }
diff --git a/src/browser/webapi/net/Headers.zig b/src/browser/webapi/net/Headers.zig
index 9dea0b95..136207bd 100644
--- a/src/browser/webapi/net/Headers.zig
+++ b/src/browser/webapi/net/Headers.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const js = @import("../../js/js.zig");
+const log = @import("../../../log.zig");
 
 const Page = @import("../../Page.zig");
 const KeyValueList = @import("../KeyValueList.zig");
@@ -15,27 +16,58 @@ pub fn init(page: *Page) !*Headers {
 }
 
 pub fn append(self: *Headers, name: []const u8, value: []const u8, page: *Page) !void {
-    try self._list.append(page.arena, name, value);
+    const normalized_name = normalizeHeaderName(name, page);
+    try self._list.append(page.arena, normalized_name, value);
 }
 
-pub fn delete(self: *Headers, name: []const u8) void {
-    self._list.delete(name, null);
+pub fn delete(self: *Headers, name: []const u8, page: *Page) void {
+    const normalized_name = normalizeHeaderName(name, page);
+    self._list.delete(normalized_name, null);
 }
 
-pub fn get(self: *const Headers, name: []const u8) ?[]const u8 {
-    return self._list.get(name);
+pub fn get(self: *const Headers, name: []const u8, page: *Page) ?[]const u8 {
+    const normalized_name = normalizeHeaderName(name, page);
+    return self._list.get(normalized_name);
 }
 
-pub fn getAll(self: *const Headers, name: []const u8, page: *Page) ![]const []const u8 {
-    return self._list.getAll(name, page);
-}
-
-pub fn has(self: *const Headers, name: []const u8) bool {
-    return self._list.has(name);
+pub fn has(self: *const Headers, name: []const u8, page: *Page) bool {
+    const normalized_name = normalizeHeaderName(name, page);
+    return self._list.has(normalized_name);
 }
 
 pub fn set(self: *Headers, name: []const u8, value: []const u8, page: *Page) !void {
-    try self._list.set(page.arena, name, value);
+    const normalized_name = normalizeHeaderName(name, page);
+    try self._list.set(page.arena, normalized_name, value);
+}
+
+pub fn keys(self: *Headers, page: *Page) !*KeyValueList.KeyIterator {
+    return KeyValueList.KeyIterator.init(.{ .list = self, .kv = &self._list }, page);
+}
+
+pub fn values(self: *Headers, page: *Page) !*KeyValueList.ValueIterator {
+    return KeyValueList.ValueIterator.init(.{ .list = self, .kv = &self._list }, page);
+}
+
+pub fn entries(self: *Headers, page: *Page) !*KeyValueList.EntryIterator {
+    return KeyValueList.EntryIterator.init(.{ .list = self, .kv = &self._list }, page);
+}
+
+pub fn forEach(self: *Headers, cb_: js.Function, js_this_: ?js.Object) !void {
+    const cb = if (js_this_) |js_this| try cb_.withThis(js_this) else cb_;
+
+    for (self._list._entries.items) |entry| {
+        var result: js.Function.Result = undefined;
+        cb.tryCall(void, .{ entry.value.str(), entry.name.str(), self }, &result) catch {
+            log.debug(.js, "forEach callback", .{ .err = result.exception, .stack = result.stack, .source = "headers" });
+        };
+    }
+}
+
+fn normalizeHeaderName(name: []const u8, page: *Page) []const u8 {
+    if (name.len > page.buf.len) {
+        return name;
+    }
+    return std.ascii.lowerString(&page.buf, name);
 }
 
 pub const JsApi = struct {
@@ -51,9 +83,12 @@ pub const JsApi = struct {
     pub const append = bridge.function(Headers.append, .{});
     pub const delete = bridge.function(Headers.delete, .{});
     pub const get = bridge.function(Headers.get, .{});
-    pub const getAll = bridge.function(Headers.getAll, .{});
     pub const has = bridge.function(Headers.has, .{});
     pub const set = bridge.function(Headers.set, .{});
+    pub const keys = bridge.function(Headers.keys, .{});
+    pub const values = bridge.function(Headers.values, .{});
+    pub const entries = bridge.function(Headers.entries, .{});
+    pub const forEach = bridge.function(Headers.forEach, .{});
 };
 
 const testing = @import("../../../testing.zig");