content/browser/accessibility/accessibility_mode_browsertest.cc - chromium/src - Git at Google

 // Copyright 2014 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "base/test/run_until.h"
 #include "base/test/scoped_run_loop_timeout.h"
 #include "build/build_config.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/accessibility_notification_waiter.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/scoped_accessibility_mode_override.h"
 #include "content/shell/browser/shell.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/accessibility/ax_mode.h"
 #include "ui/accessibility/platform/browser_accessibility.h"
 #include "ui/accessibility/platform/browser_accessibility_manager.h"

 namespace content {

 const char kMinimalPageDataURL[] =
     "data:text/html,<html><head></head><body>Hello, world</body></html>";

 class AccessibilityModeTest : public ContentBrowserTest {
  protected:
   WebContentsImpl* web_contents() {
     return static_cast<WebContentsImpl*>(shell()->web_contents());
   }

   const ui::BrowserAccessibility* FindNode(ax::mojom::Role role,
                                            const std::string& name) {
     const ui::BrowserAccessibility* root =
         GetManager()->GetBrowserAccessibilityRoot();
     CHECK(root);
     return FindNodeInSubtree(*root, role, name);
   }

   ui::BrowserAccessibilityManager* GetManager() {
     WebContentsImpl* web_contents =
         static_cast<WebContentsImpl*>(shell()->web_contents());
     return web_contents->GetRootBrowserAccessibilityManager();
   }

  private:
   const ui::BrowserAccessibility* FindNodeInSubtree(
       const ui::BrowserAccessibility& node,
       ax::mojom::Role role,
       const std::string& name) {
     if (node.GetRole() == role &&
         node.GetStringAttribute(ax::mojom::StringAttribute::kName) == name) {
       return &node;
     }
     for (unsigned int i = 0; i < node.PlatformChildCount(); ++i) {
       const ui::BrowserAccessibility* result =
           FindNodeInSubtree(*node.PlatformGetChild(i), role, name);
       if (result) {
         return result;
       }
     }
     return nullptr;
   }
 };

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AccessibilityModeOff) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
   EXPECT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());
   EXPECT_EQ(nullptr, GetManager());
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AccessibilityModeComplete) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
   ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

   AccessibilityNotificationWaiter waiter(shell()->web_contents());
   ScopedAccessibilityModeOverride scoped_accessibility_mode(
       web_contents(), ui::kAXModeComplete);
   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
   ASSERT_TRUE(waiter.WaitForNotification());
   EXPECT_NE(nullptr, GetManager());
 }

 // Tests that adding kAXModeComplete via BrowserAccessibilityState gives the
 // flags to an active WebContents.
 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
                        AccessibilityModeCompleteViaContent) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
   ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

   AccessibilityNotificationWaiter waiter(shell()->web_contents());
   ScopedAccessibilityModeOverride complete(ui::kAXModeComplete);
   ASSERT_TRUE(waiter.WaitForNotification());
   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
   EXPECT_NE(nullptr, GetManager());
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
                        AccessibilityModeWebContentsOnly) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
   ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

   AccessibilityNotificationWaiter waiter(shell()->web_contents());
   ScopedAccessibilityModeOverride scoped_accessibility_mode(
       web_contents(), ui::kAXModeWebContentsOnly);

   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeWebContentsOnly);
   ASSERT_TRUE(waiter.WaitForNotification());
   EXPECT_EQ(nullptr, GetManager());
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AddingModes) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));

   AccessibilityNotificationWaiter waiter(shell()->web_contents());
   ScopedAccessibilityModeOverride scoped_accessibility_mode(
       web_contents(), ui::kAXModeWebContentsOnly);
   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeWebContentsOnly);
   ASSERT_TRUE(waiter.WaitForNotification());
   EXPECT_EQ(nullptr, GetManager());

   AccessibilityNotificationWaiter waiter2(shell()->web_contents());
   ScopedAccessibilityModeOverride scoped_accessibility_mode2(
       web_contents(), ui::kAXModeComplete);
   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
   ASSERT_TRUE(waiter2.WaitForNotification());
   EXPECT_NE(nullptr, GetManager());
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
                        FullAccessibilityHasInlineTextBoxes) {
   // TODO(dmazzoni): On Android we use an ifdef to disable inline text boxes,
   // we should do it with accessibility flags instead. http://crbug.com/672205
 #if !BUILDFLAG(IS_ANDROID)
   EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

   AccessibilityNotificationWaiter waiter(shell()->web_contents(),
                                          ax::mojom::Event::kLoadComplete);
   ScopedAccessibilityModeOverride scoped_accessibility_mode(
       web_contents(), ui::kAXModeComplete);
   GURL url("data:text/html,<p>Para</p>");
   EXPECT_TRUE(NavigateToURL(shell(), url));
   ASSERT_TRUE(waiter.WaitForNotification());

   const ui::BrowserAccessibility* text =
       FindNode(ax::mojom::Role::kStaticText, "Para");
   ASSERT_NE(nullptr, text);
   ASSERT_EQ(1U, text->InternalChildCount());
   ui::BrowserAccessibility* inline_text = text->InternalGetChild(0);
   ASSERT_NE(nullptr, inline_text);
   EXPECT_EQ(ax::mojom::Role::kInlineTextBox, inline_text->GetRole());
 #endif  // !BUILDFLAG(IS_ANDROID)
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
                        MinimalAccessibilityModeHasNoInlineTextBoxes) {
   // TODO(dmazzoni): On Android we use an ifdef to disable inline text boxes,
   // we should do it with accessibility flags instead. http://crbug.com/672205
 #if !BUILDFLAG(IS_ANDROID)
   EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

   AccessibilityNotificationWaiter waiter(
       shell()->web_contents(),
       ax::mojom::Event::kLoadComplete);
   ScopedAccessibilityModeOverride basic(ui::kAXModeBasic);
   GURL url("data:text/html,<p>Para</p>");
   EXPECT_TRUE(NavigateToURL(shell(), url));
   ASSERT_TRUE(waiter.WaitForNotification());

   const ui::BrowserAccessibility* text =
       FindNode(ax::mojom::Role::kStaticText, "Para");
   ASSERT_NE(nullptr, text);
   EXPECT_EQ(0U, text->InternalChildCount());
 #endif  // !BUILDFLAG(IS_ANDROID)
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AddScreenReaderModeFlag) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

   AccessibilityNotificationWaiter waiter(
       shell()->web_contents(),
       ax::mojom::Event::kLoadComplete);
   ScopedAccessibilityModeOverride basic(ui::kAXModeBasic);
   GURL url("data:text/html,<input aria-label=Foo placeholder=Bar>");
   EXPECT_TRUE(NavigateToURL(shell(), url));
   ASSERT_TRUE(waiter.WaitForNotification());

   const ui::BrowserAccessibility* textbox =
       FindNode(ax::mojom::Role::kTextField, "Foo");
   ASSERT_NE(nullptr, textbox);
   EXPECT_FALSE(
       textbox->HasStringAttribute(ax::mojom::StringAttribute::kPlaceholder));
   int original_id = textbox->GetId();

   AccessibilityNotificationWaiter waiter2(shell()->web_contents(),
                                           ax::mojom::Event::kLoadComplete);
   ScopedAccessibilityModeOverride ax_mode_override(
       ui::AXMode::kExtendedProperties);
   ASSERT_TRUE(waiter2.WaitForNotification());

   const ui::BrowserAccessibility* textbox2 =
       FindNode(ax::mojom::Role::kTextField, "Foo");
   ASSERT_NE(nullptr, textbox2);
   EXPECT_TRUE(
       textbox2->HasStringAttribute(ax::mojom::StringAttribute::kPlaceholder));
   EXPECT_EQ(original_id, textbox2->GetId());
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, TestEngineUseHistograms) {
   // Check that we are starting with AXMode, so that we don't fail if a11y was
   // already on when the test starts, e.g. in Android Automotive.
   if (!BrowserAccessibilityState::GetInstance()
            ->GetAccessibilityMode()
            .is_mode_off()) {
     return;
   }

   base::HistogramTester histograms;
   histograms.ExpectTotalCount("Accessibility.EngineUse.PageNavsUntilStart", 0);
   histograms.ExpectTotalCount("Accessibility.EngineUse.TimeUntilStart", 0);

   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));

   // We only consider it a start when AXMode::kWebContents is set.
   ScopedAccessibilityModeOverride native_apis(ui::AXMode::kNativeAPIs);
   histograms.ExpectTotalCount("Accessibility.EngineUse.PageNavsUntilStart", 0);
   histograms.ExpectTotalCount("Accessibility.EngineUse.TimeUntilStart", 0);

   EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

   // This is considered a start of the engine (the Blink a11y pipeline).
   ScopedAccessibilityModeOverride web_contents(ui::AXMode::kWebContents);
   ASSERT_TRUE(base::test::RunUntil([&]() {
     return histograms
                .GetAllSamples("Accessibility.EngineUse.PageNavsUntilStart")
                .empty() == false;
   }));

   histograms.ExpectTotalCount("Accessibility.EngineUse.PageNavsUntilStart", 1);
   histograms.ExpectUniqueSample("Accessibility.EngineUse.PageNavsUntilStart", 2,
                                 1);
   histograms.ExpectTotalCount("Accessibility.EngineUse.TimeUntilStart", 1);
 }

 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
                        ReEnablingAccessibilityDoesNotTimeout) {
   EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
   ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

   AccessibilityNotificationWaiter waiter(shell()->web_contents());
   ScopedAccessibilityModeOverride scoped_accessibility_mode(
       web_contents(), ui::kAXModeWebContentsOnly);
   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeWebContentsOnly);
   ASSERT_TRUE(waiter.WaitForNotification());
   EXPECT_EQ(nullptr, GetManager());

   AccessibilityNotificationWaiter waiter2(shell()->web_contents());
   ScopedAccessibilityModeOverride scoped_accessibility_mode2(
       web_contents(), ui::kAXModeComplete);
   EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
   ASSERT_TRUE(waiter2.WaitForNotification());
   EXPECT_NE(nullptr, GetManager());
 }

 // Test platform node ids on OS's that have platform nodes.
 #if !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_ANDROID)
 IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, ReEnablingDoesNotAlterUniqueIds) {
   ASSERT_TRUE(NavigateToURL(shell(), GURL(R"HTML(
       data:text/html,<!DOCTYPE html>
       <html>
       <body>
         <button>Button 1</button>
         <iframe srcdoc="
           <!DOCTYPE html>
           <html>
           <body>
             <button>Button 2</button>
           </body>
           </html>
         "></iframe>
         <button>Button 3</button>
       </body>
       </html>)HTML")));

   // Turn accessibility on.
   AccessibilityNotificationWaiter waiter(shell()->web_contents());
   std::optional<ScopedAccessibilityModeOverride> ax_mode(ui::kAXModeComplete);
   ASSERT_TRUE(waiter.WaitForNotification());
   WaitForAccessibilityTreeToContainNodeWithName(shell()->web_contents(),
                                                 "Button 2");

   // Save unique ids.
   auto accessibility_mode = web_contents()->GetAccessibilityMode();
   ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kNativeAPIs));
   ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kWebContents));
   EXPECT_NE(nullptr, GetManager());
   const ui::BrowserAccessibility* button_1 =
       FindNode(ax::mojom::Role::kButton, "Button 1");
   ASSERT_NE(nullptr, button_1);
   const ui::BrowserAccessibility* button_2 =
       FindNode(ax::mojom::Role::kButton, "Button 2");
   ASSERT_NE(nullptr, button_2);

   int32_t unique_id_1 = button_1->GetAXPlatformNode()->GetUniqueId();
   int32_t unique_id_2 = button_2->GetAXPlatformNode()->GetUniqueId();

   // Turn accessibility off again.
   ax_mode.reset();
   accessibility_mode = web_contents()->GetAccessibilityMode();
   ASSERT_TRUE(accessibility_mode.is_mode_off());
   EXPECT_EQ(nullptr, GetManager());

   // Turn accessibility on again.
   AccessibilityNotificationWaiter waiter_3(shell()->web_contents());
   ax_mode.emplace(ui::kAXModeBasic);
   ASSERT_TRUE(waiter_3.WaitForNotification());
   WaitForAccessibilityTreeToContainNodeWithName(shell()->web_contents(),
                                                 "Button 2");

   // Compare unique id for newly created a11y nodes with previous unique ids.
   accessibility_mode = web_contents()->GetAccessibilityMode();
   ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kNativeAPIs));
   ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kWebContents));
   EXPECT_NE(nullptr, GetManager());
   const ui::BrowserAccessibility* button_1_refresh =
       FindNode(ax::mojom::Role::kButton, "Button 1");
   ASSERT_NE(nullptr, button_1_refresh);
   // button_1 is now a dangling pointer for the old button.
   // The pointers are not the same, proving that button_1_refresh is new.
   ASSERT_NE(button_1, button_1_refresh);
   const ui::BrowserAccessibility* button_2_refresh =
       FindNode(ax::mojom::Role::kButton, "Button 2");
   ASSERT_NE(nullptr, button_2_refresh);
   // button_2 is now a dangling pointer for the old button.
   // The pointers are not the same, proving that button_2_refresh is new.
   ASSERT_NE(button_2, button_2_refresh);

   EXPECT_EQ(unique_id_1, button_1_refresh->GetAXPlatformNode()->GetUniqueId());
   EXPECT_EQ(unique_id_2, button_2_refresh->GetAXPlatformNode()->GetUniqueId());
 }
 #endif  // #if !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_ANDROID)

 }  // namespace content
	// Copyright 2014 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "base/test/run_until.h"
	#include "base/test/scoped_run_loop_timeout.h"
	#include "build/build_config.h"
	#include "content/browser/renderer_host/render_view_host_impl.h"
	#include "content/browser/renderer_host/render_widget_host_impl.h"
	#include "content/browser/renderer_host/render_widget_host_view_base.h"
	#include "content/browser/web_contents/web_contents_impl.h"
	#include "content/public/browser/browser_accessibility_state.h"
	#include "content/public/browser/render_view_host.h"
	#include "content/public/browser/render_widget_host.h"
	#include "content/public/browser/render_widget_host_view.h"
	#include "content/public/browser/web_contents.h"
	#include "content/public/common/url_constants.h"
	#include "content/public/test/accessibility_notification_waiter.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/scoped_accessibility_mode_override.h"
	#include "content/shell/browser/shell.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "ui/accessibility/ax_mode.h"
	#include "ui/accessibility/platform/browser_accessibility.h"
	#include "ui/accessibility/platform/browser_accessibility_manager.h"

	namespace content {

	const char kMinimalPageDataURL[] =
	"data:text/html,<html><head></head><body>Hello, world</body></html>";

	class AccessibilityModeTest : public ContentBrowserTest {
	protected:
	WebContentsImpl* web_contents() {
	return static_cast<WebContentsImpl*>(shell()->web_contents());
	}

	const ui::BrowserAccessibility* FindNode(ax::mojom::Role role,
	const std::string& name) {
	const ui::BrowserAccessibility* root =
	GetManager()->GetBrowserAccessibilityRoot();
	CHECK(root);
	return FindNodeInSubtree(*root, role, name);
	}

	ui::BrowserAccessibilityManager* GetManager() {
	WebContentsImpl* web_contents =
	static_cast<WebContentsImpl*>(shell()->web_contents());
	return web_contents->GetRootBrowserAccessibilityManager();
	}

	private:
	const ui::BrowserAccessibility* FindNodeInSubtree(
	const ui::BrowserAccessibility& node,
	ax::mojom::Role role,
	const std::string& name) {
	if (node.GetRole() == role &&
	node.GetStringAttribute(ax::mojom::StringAttribute::kName) == name) {
	return &node;
	}
	for (unsigned int i = 0; i < node.PlatformChildCount(); ++i) {
	const ui::BrowserAccessibility* result =
	FindNodeInSubtree(*node.PlatformGetChild(i), role, name);
	if (result) {
	return result;
	}
	}
	return nullptr;
	}
	};

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AccessibilityModeOff) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
	EXPECT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());
	EXPECT_EQ(nullptr, GetManager());
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AccessibilityModeComplete) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
	ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

	AccessibilityNotificationWaiter waiter(shell()->web_contents());
	ScopedAccessibilityModeOverride scoped_accessibility_mode(
	web_contents(), ui::kAXModeComplete);
	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
	ASSERT_TRUE(waiter.WaitForNotification());
	EXPECT_NE(nullptr, GetManager());
	}

	// Tests that adding kAXModeComplete via BrowserAccessibilityState gives the
	// flags to an active WebContents.
	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
	AccessibilityModeCompleteViaContent) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
	ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

	AccessibilityNotificationWaiter waiter(shell()->web_contents());
	ScopedAccessibilityModeOverride complete(ui::kAXModeComplete);
	ASSERT_TRUE(waiter.WaitForNotification());
	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
	EXPECT_NE(nullptr, GetManager());
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
	AccessibilityModeWebContentsOnly) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
	ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

	AccessibilityNotificationWaiter waiter(shell()->web_contents());
	ScopedAccessibilityModeOverride scoped_accessibility_mode(
	web_contents(), ui::kAXModeWebContentsOnly);

	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeWebContentsOnly);
	ASSERT_TRUE(waiter.WaitForNotification());
	EXPECT_EQ(nullptr, GetManager());
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AddingModes) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));

	AccessibilityNotificationWaiter waiter(shell()->web_contents());
	ScopedAccessibilityModeOverride scoped_accessibility_mode(
	web_contents(), ui::kAXModeWebContentsOnly);
	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeWebContentsOnly);
	ASSERT_TRUE(waiter.WaitForNotification());
	EXPECT_EQ(nullptr, GetManager());

	AccessibilityNotificationWaiter waiter2(shell()->web_contents());
	ScopedAccessibilityModeOverride scoped_accessibility_mode2(
	web_contents(), ui::kAXModeComplete);
	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
	ASSERT_TRUE(waiter2.WaitForNotification());
	EXPECT_NE(nullptr, GetManager());
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
	FullAccessibilityHasInlineTextBoxes) {
	// TODO(dmazzoni): On Android we use an ifdef to disable inline text boxes,
	// we should do it with accessibility flags instead. http://crbug.com/672205
	#if !BUILDFLAG(IS_ANDROID)
	EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

	AccessibilityNotificationWaiter waiter(shell()->web_contents(),
	ax::mojom::Event::kLoadComplete);
	ScopedAccessibilityModeOverride scoped_accessibility_mode(
	web_contents(), ui::kAXModeComplete);
	GURL url("data:text/html,<p>Para</p>");
	EXPECT_TRUE(NavigateToURL(shell(), url));
	ASSERT_TRUE(waiter.WaitForNotification());

	const ui::BrowserAccessibility* text =
	FindNode(ax::mojom::Role::kStaticText, "Para");
	ASSERT_NE(nullptr, text);
	ASSERT_EQ(1U, text->InternalChildCount());
	ui::BrowserAccessibility* inline_text = text->InternalGetChild(0);
	ASSERT_NE(nullptr, inline_text);
	EXPECT_EQ(ax::mojom::Role::kInlineTextBox, inline_text->GetRole());
	#endif // !BUILDFLAG(IS_ANDROID)
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
	MinimalAccessibilityModeHasNoInlineTextBoxes) {
	// TODO(dmazzoni): On Android we use an ifdef to disable inline text boxes,
	// we should do it with accessibility flags instead. http://crbug.com/672205
	#if !BUILDFLAG(IS_ANDROID)
	EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

	AccessibilityNotificationWaiter waiter(
	shell()->web_contents(),
	ax::mojom::Event::kLoadComplete);
	ScopedAccessibilityModeOverride basic(ui::kAXModeBasic);
	GURL url("data:text/html,<p>Para</p>");
	EXPECT_TRUE(NavigateToURL(shell(), url));
	ASSERT_TRUE(waiter.WaitForNotification());

	const ui::BrowserAccessibility* text =
	FindNode(ax::mojom::Role::kStaticText, "Para");
	ASSERT_NE(nullptr, text);
	EXPECT_EQ(0U, text->InternalChildCount());
	#endif // !BUILDFLAG(IS_ANDROID)
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, AddScreenReaderModeFlag) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

	AccessibilityNotificationWaiter waiter(
	shell()->web_contents(),
	ax::mojom::Event::kLoadComplete);
	ScopedAccessibilityModeOverride basic(ui::kAXModeBasic);
	GURL url("data:text/html,<input aria-label=Foo placeholder=Bar>");
	EXPECT_TRUE(NavigateToURL(shell(), url));
	ASSERT_TRUE(waiter.WaitForNotification());

	const ui::BrowserAccessibility* textbox =
	FindNode(ax::mojom::Role::kTextField, "Foo");
	ASSERT_NE(nullptr, textbox);
	EXPECT_FALSE(
	textbox->HasStringAttribute(ax::mojom::StringAttribute::kPlaceholder));
	int original_id = textbox->GetId();

	AccessibilityNotificationWaiter waiter2(shell()->web_contents(),
	ax::mojom::Event::kLoadComplete);
	ScopedAccessibilityModeOverride ax_mode_override(
	ui::AXMode::kExtendedProperties);
	ASSERT_TRUE(waiter2.WaitForNotification());

	const ui::BrowserAccessibility* textbox2 =
	FindNode(ax::mojom::Role::kTextField, "Foo");
	ASSERT_NE(nullptr, textbox2);
	EXPECT_TRUE(
	textbox2->HasStringAttribute(ax::mojom::StringAttribute::kPlaceholder));
	EXPECT_EQ(original_id, textbox2->GetId());
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, TestEngineUseHistograms) {
	// Check that we are starting with AXMode, so that we don't fail if a11y was
	// already on when the test starts, e.g. in Android Automotive.
	if (!BrowserAccessibilityState::GetInstance()
	->GetAccessibilityMode()
	.is_mode_off()) {
	return;
	}

	base::HistogramTester histograms;
	histograms.ExpectTotalCount("Accessibility.EngineUse.PageNavsUntilStart", 0);
	histograms.ExpectTotalCount("Accessibility.EngineUse.TimeUntilStart", 0);

	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));

	// We only consider it a start when AXMode::kWebContents is set.
	ScopedAccessibilityModeOverride native_apis(ui::AXMode::kNativeAPIs);
	histograms.ExpectTotalCount("Accessibility.EngineUse.PageNavsUntilStart", 0);
	histograms.ExpectTotalCount("Accessibility.EngineUse.TimeUntilStart", 0);

	EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));

	// This is considered a start of the engine (the Blink a11y pipeline).
	ScopedAccessibilityModeOverride web_contents(ui::AXMode::kWebContents);
	ASSERT_TRUE(base::test::RunUntil([&]() {
	return histograms
	.GetAllSamples("Accessibility.EngineUse.PageNavsUntilStart")
	.empty() == false;
	}));

	histograms.ExpectTotalCount("Accessibility.EngineUse.PageNavsUntilStart", 1);
	histograms.ExpectUniqueSample("Accessibility.EngineUse.PageNavsUntilStart", 2,
	1);
	histograms.ExpectTotalCount("Accessibility.EngineUse.TimeUntilStart", 1);
	}

	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest,
	ReEnablingAccessibilityDoesNotTimeout) {
	EXPECT_TRUE(NavigateToURL(shell(), GURL(kMinimalPageDataURL)));
	ASSERT_TRUE(web_contents()->GetAccessibilityMode().is_mode_off());

	AccessibilityNotificationWaiter waiter(shell()->web_contents());
	ScopedAccessibilityModeOverride scoped_accessibility_mode(
	web_contents(), ui::kAXModeWebContentsOnly);
	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeWebContentsOnly);
	ASSERT_TRUE(waiter.WaitForNotification());
	EXPECT_EQ(nullptr, GetManager());

	AccessibilityNotificationWaiter waiter2(shell()->web_contents());
	ScopedAccessibilityModeOverride scoped_accessibility_mode2(
	web_contents(), ui::kAXModeComplete);
	EXPECT_EQ(web_contents()->GetAccessibilityMode(), ui::kAXModeComplete);
	ASSERT_TRUE(waiter2.WaitForNotification());
	EXPECT_NE(nullptr, GetManager());
	}

	// Test platform node ids on OS's that have platform nodes.
	#if !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_ANDROID)
	IN_PROC_BROWSER_TEST_F(AccessibilityModeTest, ReEnablingDoesNotAlterUniqueIds) {
	ASSERT_TRUE(NavigateToURL(shell(), GURL(R"HTML(
	data:text/html,<!DOCTYPE html>
	<html>
	<body>
	<button>Button 1</button>
	<iframe srcdoc="
	<!DOCTYPE html>
	<html>
	<body>
	<button>Button 2</button>
	</body>
	</html>
	"></iframe>
	<button>Button 3</button>
	</body>
	</html>)HTML")));

	// Turn accessibility on.
	AccessibilityNotificationWaiter waiter(shell()->web_contents());
	std::optional<ScopedAccessibilityModeOverride> ax_mode(ui::kAXModeComplete);
	ASSERT_TRUE(waiter.WaitForNotification());
	WaitForAccessibilityTreeToContainNodeWithName(shell()->web_contents(),
	"Button 2");

	// Save unique ids.
	auto accessibility_mode = web_contents()->GetAccessibilityMode();
	ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kNativeAPIs));
	ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kWebContents));
	EXPECT_NE(nullptr, GetManager());
	const ui::BrowserAccessibility* button_1 =
	FindNode(ax::mojom::Role::kButton, "Button 1");
	ASSERT_NE(nullptr, button_1);
	const ui::BrowserAccessibility* button_2 =
	FindNode(ax::mojom::Role::kButton, "Button 2");
	ASSERT_NE(nullptr, button_2);

	int32_t unique_id_1 = button_1->GetAXPlatformNode()->GetUniqueId();
	int32_t unique_id_2 = button_2->GetAXPlatformNode()->GetUniqueId();

	// Turn accessibility off again.
	ax_mode.reset();
	accessibility_mode = web_contents()->GetAccessibilityMode();
	ASSERT_TRUE(accessibility_mode.is_mode_off());
	EXPECT_EQ(nullptr, GetManager());

	// Turn accessibility on again.
	AccessibilityNotificationWaiter waiter_3(shell()->web_contents());
	ax_mode.emplace(ui::kAXModeBasic);
	ASSERT_TRUE(waiter_3.WaitForNotification());
	WaitForAccessibilityTreeToContainNodeWithName(shell()->web_contents(),
	"Button 2");

	// Compare unique id for newly created a11y nodes with previous unique ids.
	accessibility_mode = web_contents()->GetAccessibilityMode();
	ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kNativeAPIs));
	ASSERT_TRUE(accessibility_mode.has_mode(ui::AXMode::kWebContents));
	EXPECT_NE(nullptr, GetManager());
	const ui::BrowserAccessibility* button_1_refresh =
	FindNode(ax::mojom::Role::kButton, "Button 1");
	ASSERT_NE(nullptr, button_1_refresh);
	// button_1 is now a dangling pointer for the old button.
	// The pointers are not the same, proving that button_1_refresh is new.
	ASSERT_NE(button_1, button_1_refresh);
	const ui::BrowserAccessibility* button_2_refresh =
	FindNode(ax::mojom::Role::kButton, "Button 2");
	ASSERT_NE(nullptr, button_2_refresh);
	// button_2 is now a dangling pointer for the old button.
	// The pointers are not the same, proving that button_2_refresh is new.
	ASSERT_NE(button_2, button_2_refresh);

	EXPECT_EQ(unique_id_1, button_1_refresh->GetAXPlatformNode()->GetUniqueId());
	EXPECT_EQ(unique_id_2, button_2_refresh->GetAXPlatformNode()->GetUniqueId());
	}
	#endif // #if !BUILDFLAG(IS_CHROMEOS) && !BUILDFLAG(IS_ANDROID)

	} // namespace content