diff --git a/content/browser/android/text_suggestion_host_android_browsertest.cc b/content/browser/android/text_suggestion_host_android_browsertest.cc
new file mode 100644
index 0000000000000..8fd4125e5561c
--- /dev/null
+++ b/content/browser/android/text_suggestion_host_android_browsertest.cc
@@ -0,0 +1,88 @@
+// Copyright 2026 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/android/text_suggestion_host_android.h"
+
+#include "base/command_line.h"
+#include "content/browser/renderer_host/frame_tree_node.h"
+#include "content/browser/renderer_host/render_frame_host_impl.h"
+#include "content/browser/site_instance_impl.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/test/browser_test.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "net/dns/mock_host_resolver.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+#include "url/gurl.h"
+
+namespace content {
+
+class TextSuggestionHostAndroidBrowserTest : public ContentBrowserTest {
+ public:
+  TextSuggestionHostAndroidBrowserTest() = default;
+  ~TextSuggestionHostAndroidBrowserTest() override = default;
+
+ protected:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    IsolateAllSitesForTesting(command_line);
+  }
+
+  void SetUpOnMainThread() override {
+    host_resolver()->AddRule("*", "127.0.0.1");
+    SetupCrossSiteRedirector(embedded_test_server());
+    ASSERT_TRUE(embedded_test_server()->Start());
+  }
+
+  WebContentsImpl* web_contents() const {
+    return static_cast<WebContentsImpl*>(shell()->web_contents());
+  }
+};
+
+// The text-suggestion popup is displayed at WebContents scope but the
+// associated state must be tracked per frame so that suggestions chosen by the
+// user are routed back to the frame that requested the popup, even when a page
+// embeds out-of-process iframes and focus moves between them.
+IN_PROC_BROWSER_TEST_F(TextSuggestionHostAndroidBrowserTest,
+                       PerFrameStateWithCrossProcessIframe) {
+  GURL main_url(embedded_test_server()->GetURL(
+      "a.com", "/cross_site_iframe_factory.html?a(b)"));
+  ASSERT_TRUE(NavigateToURL(shell(), main_url));
+
+  FrameTreeNode* root = web_contents()->GetPrimaryFrameTree().root();
+  ASSERT_EQ(1u, root->child_count());
+  FrameTreeNode* child = root->child_at(0);
+
+  RenderFrameHostImpl* main_frame = root->current_frame_host();
+  RenderFrameHostImpl* child_frame = child->current_frame_host();
+  ASSERT_NE(main_frame->GetProcess(), child_frame->GetProcess());
+
+  auto* main_host =
+      TextSuggestionHostAndroid::GetOrCreateForCurrentDocument(main_frame);
+  auto* child_host =
+      TextSuggestionHostAndroid::GetOrCreateForCurrentDocument(child_frame);
+
+  // Each frame must get its own host so that callbacks from the popup are
+  // delivered to the originating frame.
+  EXPECT_NE(main_host, child_host);
+  EXPECT_EQ(static_cast<RenderFrameHost*>(main_frame),
+            &main_host->render_frame_host());
+  EXPECT_EQ(static_cast<RenderFrameHost*>(child_frame),
+            &child_host->render_frame_host());
+
+  // Moving focus to the cross-process child must not change which frame the
+  // main frame's host is associated with.
+  web_contents()->SetFocusedFrame(child,
+                                  child_frame->GetSiteInstance()->group());
+  EXPECT_EQ(child_frame, web_contents()->GetFocusedFrame());
+
+  EXPECT_EQ(main_host,
+            TextSuggestionHostAndroid::GetForCurrentDocument(main_frame));
+  EXPECT_EQ(static_cast<RenderFrameHost*>(main_frame),
+            &main_host->render_frame_host());
+}
+
+}  // namespace content
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 6715f3509d441..23c6d53e44b8d 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -2289,6 +2289,7 @@ test("content_browsertests") {
       "../browser/android/render_widget_host_connector_browsertest.cc",
       "../browser/android/render_widget_host_connector_browsertest.h",
       "../browser/android/synchronous_compositor_browsertest.cc",
+      "../browser/android/text_suggestion_host_android_browsertest.cc",
       "../browser/date_time_chooser/android/date_time_chooser_browsertest.cc",
       "../browser/media/session/audio_focus_delegate_android_browsertest.cc",
       "../browser/renderer_host/compositor_impl_android_browsertest.cc",