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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <string>
 #include <vector>

 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/test/accessibility_browser_test_utils.h"
 #include "ui/accessibility/ax_node.h"
 #include "ui/accessibility/ax_tree.h"

 #if defined(OS_WIN)
 #include <atlbase.h>
 #include <atlcom.h>
 #include "base/win/scoped_com_initializer.h"
 #include "ui/base/win/atl_module.h"
 #endif

 // TODO(dmazzoni): Disabled accessibility tests on Win64. crbug.com/179717
 #if defined(OS_WIN) && defined(ARCH_CPU_X86_64)
 #define MAYBE_TableSpan DISABLED_TableSpan
 #else
 #define MAYBE_TableSpan TableSpan
 #endif

 namespace content {

 class CrossPlatformAccessibilityBrowserTest : public ContentBrowserTest {
  public:
   CrossPlatformAccessibilityBrowserTest() {}

   // Tell the renderer to send an accessibility tree, then wait for the
   // notification that it's been received.
   const ui::AXTree& GetAXTree(
       AccessibilityMode accessibility_mode = AccessibilityModeComplete) {
     AccessibilityNotificationWaiter waiter(
         shell(), accessibility_mode, ui::AX_EVENT_LAYOUT_COMPLETE);
     waiter.WaitForNotification();
     return waiter.GetAXTree();
   }

   // Make sure each node in the tree has a unique id.
   void RecursiveAssertUniqueIds(
       const ui::AXNode* node, base::hash_set<int>* ids) {
     ASSERT_TRUE(ids->find(node->id()) == ids->end());
     ids->insert(node->id());
     for (int i = 0; i < node->child_count(); i++)
       RecursiveAssertUniqueIds(node->ChildAtIndex(i), ids);
   }

   // ContentBrowserTest
   void SetUpInProcessBrowserTestFixture() override;
   void TearDownInProcessBrowserTestFixture() override;

  protected:
   std::string GetAttr(const ui::AXNode* node,
                       const ui::AXStringAttribute attr);
   int GetIntAttr(const ui::AXNode* node,
                  const ui::AXIntAttribute attr);
   bool GetBoolAttr(const ui::AXNode* node,
                    const ui::AXBoolAttribute attr);

  private:
 #if defined(OS_WIN)
   scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_;
 #endif

   DISALLOW_COPY_AND_ASSIGN(CrossPlatformAccessibilityBrowserTest);
 };

 void CrossPlatformAccessibilityBrowserTest::SetUpInProcessBrowserTestFixture() {
 #if defined(OS_WIN)
   ui::win::CreateATLModuleIfNeeded();
   com_initializer_.reset(new base::win::ScopedCOMInitializer());
 #endif
 }

 void
 CrossPlatformAccessibilityBrowserTest::TearDownInProcessBrowserTestFixture() {
 #if defined(OS_WIN)
   com_initializer_.reset();
 #endif
 }

 // Convenience method to get the value of a particular AXNode
 // attribute as a UTF-8 string.
 std::string CrossPlatformAccessibilityBrowserTest::GetAttr(
     const ui::AXNode* node,
     const ui::AXStringAttribute attr) {
   const ui::AXNodeData& data = node->data();
   for (size_t i = 0; i < data.string_attributes.size(); ++i) {
     if (data.string_attributes[i].first == attr)
       return data.string_attributes[i].second;
   }
   return std::string();
 }

 // Convenience method to get the value of a particular AXNode
 // integer attribute.
 int CrossPlatformAccessibilityBrowserTest::GetIntAttr(
     const ui::AXNode* node,
     const ui::AXIntAttribute attr) {
   const ui::AXNodeData& data = node->data();
   for (size_t i = 0; i < data.int_attributes.size(); ++i) {
     if (data.int_attributes[i].first == attr)
       return data.int_attributes[i].second;
   }
   return -1;
 }

 // Convenience method to get the value of a particular AXNode
 // boolean attribute.
 bool CrossPlatformAccessibilityBrowserTest::GetBoolAttr(
     const ui::AXNode* node,
     const ui::AXBoolAttribute attr) {
   const ui::AXNodeData& data = node->data();
   for (size_t i = 0; i < data.bool_attributes.size(); ++i) {
     if (data.bool_attributes[i].first == attr)
       return data.bool_attributes[i].second;
   }
   return false;
 }

 // Marked flaky per http://crbug.com/101984
 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        DISABLED_WebpageAccessibility) {
   // Create a data url and load it.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<html><head><title>Accessibility Test</title></head>"
       "<body><input type='button' value='push' /><input type='checkbox' />"
       "</body></html>";
   GURL url(url_str);
   NavigateToURL(shell(), url);
   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();

   // Check properties of thet tree.
   EXPECT_STREQ(url_str, tree.data().url.c_str());
   EXPECT_STREQ("Accessibility Test", tree.data().title.c_str());
   EXPECT_STREQ("html", tree.data().doctype.c_str());
   EXPECT_STREQ("text/html", tree.data().mimetype.c_str());

   // Check properties of the root element of the tree.
   EXPECT_STREQ(
       "Accessibility Test",
       GetAttr(root, ui::AX_ATTR_NAME).c_str());
   EXPECT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, root->data().role);

   // Check properties of the BODY element.
   ASSERT_EQ(1, root->child_count());
   const ui::AXNode* body = root->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_GROUP, body->data().role);
   EXPECT_STREQ("body",
                GetAttr(body, ui::AX_ATTR_HTML_TAG).c_str());
   EXPECT_STREQ("block",
                GetAttr(body, ui::AX_ATTR_DISPLAY).c_str());

   // Check properties of the two children of the BODY element.
   ASSERT_EQ(2, body->child_count());

   const ui::AXNode* button = body->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_BUTTON, button->data().role);
   EXPECT_STREQ(
       "input", GetAttr(button, ui::AX_ATTR_HTML_TAG).c_str());
   EXPECT_STREQ(
       "push",
       GetAttr(button, ui::AX_ATTR_NAME).c_str());
   EXPECT_STREQ(
       "inline-block",
       GetAttr(button, ui::AX_ATTR_DISPLAY).c_str());
   ASSERT_EQ(2U, button->data().html_attributes.size());
   EXPECT_STREQ("type", button->data().html_attributes[0].first.c_str());
   EXPECT_STREQ("button", button->data().html_attributes[0].second.c_str());
   EXPECT_STREQ("value", button->data().html_attributes[1].first.c_str());
   EXPECT_STREQ("push", button->data().html_attributes[1].second.c_str());

   const ui::AXNode* checkbox = body->ChildAtIndex(1);
   EXPECT_EQ(ui::AX_ROLE_CHECK_BOX, checkbox->data().role);
   EXPECT_STREQ(
       "input", GetAttr(checkbox, ui::AX_ATTR_HTML_TAG).c_str());
   EXPECT_STREQ(
       "inline-block",
       GetAttr(checkbox, ui::AX_ATTR_DISPLAY).c_str());
   ASSERT_EQ(1U, checkbox->data().html_attributes.size());
   EXPECT_STREQ("type", checkbox->data().html_attributes[0].first.c_str());
   EXPECT_STREQ("checkbox", checkbox->data().html_attributes[0].second.c_str());
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        UnselectedEditableTextAccessibility) {
   // Create a data url and load it.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<body>"
       "<input value=\"Hello, world.\"/>"
       "</body></html>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   ASSERT_EQ(1, root->child_count());
   const ui::AXNode* body = root->ChildAtIndex(0);
   ASSERT_EQ(1, body->child_count());
   const ui::AXNode* text = body->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, text->data().role);
   EXPECT_STREQ(
       "input", GetAttr(text, ui::AX_ATTR_HTML_TAG).c_str());
   EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_START));
   EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_END));
   EXPECT_STREQ(
       "Hello, world.",
       GetAttr(text, ui::AX_ATTR_VALUE).c_str());

   // TODO(dmazzoni): as soon as more accessibility code is cross-platform,
   // this code should test that the accessible info is dynamically updated
   // if the selection or value changes.
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        SelectedEditableTextAccessibility) {
   // Create a data url and load it.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<body onload=\"document.body.children[0].select();\">"
       "<input value=\"Hello, world.\"/>"
       "</body></html>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   ASSERT_EQ(1, root->child_count());
   const ui::AXNode* body = root->ChildAtIndex(0);
   ASSERT_EQ(1, body->child_count());
   const ui::AXNode* text = body->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, text->data().role);
   EXPECT_STREQ(
       "input", GetAttr(text, ui::AX_ATTR_HTML_TAG).c_str());
   EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_START));
   EXPECT_EQ(13, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_END));
   EXPECT_STREQ(
       "Hello, world.",
       GetAttr(text, ui::AX_ATTR_VALUE).c_str());
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        MultipleInheritanceAccessibility) {
   // In a WebKit accessibility render tree for a table, each cell is a
   // child of both a row and a column, so it appears to use multiple
   // inheritance. Make sure that the ui::AXNodeDataObject tree only
   // keeps one copy of each cell, and uses an indirect child id for the
   // additional reference to it.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<table border=1><tr><td>1</td><td>2</td></tr></table>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   ASSERT_EQ(1, root->child_count());
   const ui::AXNode* table = root->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_TABLE, table->data().role);
   const ui::AXNode* row = table->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_ROW, row->data().role);
   const ui::AXNode* cell1 = row->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_CELL, cell1->data().role);
   const ui::AXNode* cell2 = row->ChildAtIndex(1);
   EXPECT_EQ(ui::AX_ROLE_CELL, cell2->data().role);
   const ui::AXNode* column1 = table->ChildAtIndex(1);
   EXPECT_EQ(ui::AX_ROLE_COLUMN, column1->data().role);
   EXPECT_EQ(0, column1->child_count());
   EXPECT_EQ(1U, column1->data().intlist_attributes.size());
   EXPECT_EQ(ui::AX_ATTR_INDIRECT_CHILD_IDS,
             column1->data().intlist_attributes[0].first);
   const std::vector<int32> column1_indirect_child_ids =
       column1->data().intlist_attributes[0].second;
   EXPECT_EQ(1U, column1_indirect_child_ids.size());
   EXPECT_EQ(cell1->id(), column1_indirect_child_ids[0]);
   const ui::AXNode* column2 = table->ChildAtIndex(2);
   EXPECT_EQ(ui::AX_ROLE_COLUMN, column2->data().role);
   EXPECT_EQ(0, column2->child_count());
   EXPECT_EQ(ui::AX_ATTR_INDIRECT_CHILD_IDS,
             column2->data().intlist_attributes[0].first);
   const std::vector<int32> column2_indirect_child_ids =
       column2->data().intlist_attributes[0].second;
   EXPECT_EQ(1U, column2_indirect_child_ids.size());
   EXPECT_EQ(cell2->id(), column2_indirect_child_ids[0]);
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        MultipleInheritanceAccessibility2) {
   // Here's another html snippet where WebKit puts the same node as a child
   // of two different parents. Instead of checking the exact output, just
   // make sure that no id is reused in the resulting tree.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<script>\n"
       "  document.writeln('<q><section></section></q><q><li>');\n"
       "  setTimeout(function() {\n"
       "    document.close();\n"
       "  }, 1);\n"
       "</script>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   base::hash_set<int> ids;
   RecursiveAssertUniqueIds(root, &ids);
 }

 // TODO(dmazzoni): Needs to be rebaselined. http://crbug.com/347464
 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        DISABLED_IframeAccessibility) {
   // Create a data url and load it.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html><html><body>"
       "<button>Button 1</button>"
       "<iframe src='data:text/html,"
       "<!doctype html><html><body><button>Button 2</button></body></html>"
       "'></iframe>"
       "<button>Button 3</button>"
       "</body></html>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   ASSERT_EQ(1, root->child_count());
   const ui::AXNode* body = root->ChildAtIndex(0);
   ASSERT_EQ(3, body->child_count());

   const ui::AXNode* button1 = body->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_BUTTON, button1->data().role);
   EXPECT_STREQ(
       "Button 1",
       GetAttr(button1, ui::AX_ATTR_NAME).c_str());

   const ui::AXNode* iframe = body->ChildAtIndex(1);
   EXPECT_STREQ("iframe",
                GetAttr(iframe, ui::AX_ATTR_HTML_TAG).c_str());
   ASSERT_EQ(1, iframe->child_count());

   const ui::AXNode* scroll_area = iframe->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_SCROLL_AREA, scroll_area->data().role);
   ASSERT_EQ(1, scroll_area->child_count());

   const ui::AXNode* sub_document = scroll_area->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_WEB_AREA, sub_document->data().role);
   ASSERT_EQ(1, sub_document->child_count());

   const ui::AXNode* sub_body = sub_document->ChildAtIndex(0);
   ASSERT_EQ(1, sub_body->child_count());

   const ui::AXNode* button2 = sub_body->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_BUTTON, button2->data().role);
   EXPECT_STREQ("Button 2",
                GetAttr(button2, ui::AX_ATTR_NAME).c_str());

   const ui::AXNode* button3 = body->ChildAtIndex(2);
   EXPECT_EQ(ui::AX_ROLE_BUTTON, button3->data().role);
   EXPECT_STREQ("Button 3",
                GetAttr(button3, ui::AX_ATTR_NAME).c_str());
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        DuplicateChildrenAccessibility) {
   // Here's another html snippet where WebKit has a parent node containing
   // two duplicate child nodes. Instead of checking the exact output, just
   // make sure that no id is reused in the resulting tree.
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<em><code ><h4 ></em>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   base::hash_set<int> ids;
   RecursiveAssertUniqueIds(root, &ids);
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        MAYBE_TableSpan) {
   // +---+---+---+
   // |   1   | 2 |
   // +---+---+---+
   // | 3 |   4   |
   // +---+---+---+

   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<table border=1>"
       " <tr>"
       "  <td colspan=2>1</td><td>2</td>"
       " </tr>"
       " <tr>"
       "  <td>3</td><td colspan=2>4</td>"
       " </tr>"
       "</table>";
   GURL url(url_str);
   NavigateToURL(shell(), url);

   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   const ui::AXNode* table = root->ChildAtIndex(0);
   EXPECT_EQ(ui::AX_ROLE_TABLE, table->data().role);
   ASSERT_GE(table->child_count(), 5);
   EXPECT_EQ(ui::AX_ROLE_ROW, table->ChildAtIndex(0)->data().role);
   EXPECT_EQ(ui::AX_ROLE_ROW, table->ChildAtIndex(1)->data().role);
   EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(2)->data().role);
   EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(3)->data().role);
   EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(4)->data().role);
   EXPECT_EQ(3,
             GetIntAttr(table, ui::AX_ATTR_TABLE_COLUMN_COUNT));
   EXPECT_EQ(2, GetIntAttr(table, ui::AX_ATTR_TABLE_ROW_COUNT));

   const ui::AXNode* cell1 = table->ChildAtIndex(0)->ChildAtIndex(0);
   const ui::AXNode* cell2 = table->ChildAtIndex(0)->ChildAtIndex(1);
   const ui::AXNode* cell3 = table->ChildAtIndex(1)->ChildAtIndex(0);
   const ui::AXNode* cell4 = table->ChildAtIndex(1)->ChildAtIndex(1);

   ASSERT_EQ(ui::AX_ATTR_CELL_IDS,
             table->data().intlist_attributes[0].first);
   const std::vector<int32>& table_cell_ids =
       table->data().intlist_attributes[0].second;
   ASSERT_EQ(6U, table_cell_ids.size());
   EXPECT_EQ(cell1->id(), table_cell_ids[0]);
   EXPECT_EQ(cell1->id(), table_cell_ids[1]);
   EXPECT_EQ(cell2->id(), table_cell_ids[2]);
   EXPECT_EQ(cell3->id(), table_cell_ids[3]);
   EXPECT_EQ(cell4->id(), table_cell_ids[4]);
   EXPECT_EQ(cell4->id(), table_cell_ids[5]);

   EXPECT_EQ(0, GetIntAttr(cell1,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
   EXPECT_EQ(0, GetIntAttr(cell1,
                           ui::AX_ATTR_TABLE_CELL_ROW_INDEX));
   EXPECT_EQ(2, GetIntAttr(cell1,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
   EXPECT_EQ(1, GetIntAttr(cell1,
                           ui::AX_ATTR_TABLE_CELL_ROW_SPAN));
   EXPECT_EQ(2, GetIntAttr(cell2,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
   EXPECT_EQ(1, GetIntAttr(cell2,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
   EXPECT_EQ(0, GetIntAttr(cell3,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
   EXPECT_EQ(1, GetIntAttr(cell3,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
   EXPECT_EQ(1, GetIntAttr(cell4,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
   EXPECT_EQ(2, GetIntAttr(cell4,
                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
 }

 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
                        WritableElement) {
   const char url_str[] =
       "data:text/html,"
       "<!doctype html>"
       "<div role='textbox' tabindex=0>"
       " Some text"
       "</div>";
   GURL url(url_str);
   NavigateToURL(shell(), url);
   const ui::AXTree& tree = GetAXTree();
   const ui::AXNode* root = tree.root();
   ASSERT_EQ(1, root->child_count());
   const ui::AXNode* textbox = root->ChildAtIndex(0);
   EXPECT_EQ(true, GetBoolAttr(textbox, ui::AX_ATTR_CAN_SET_VALUE));
 }

 }  // namespace content
	// Copyright (c) 2012 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <string>
	#include <vector>

	#include "base/strings/utf_string_conversions.h"
	#include "content/browser/renderer_host/render_view_host_impl.h"
	#include "content/public/browser/notification_service.h"
	#include "content/public/browser/notification_types.h"
	#include "content/public/browser/render_widget_host_view.h"
	#include "content/public/test/content_browser_test.h"
	#include "content/public/test/content_browser_test_utils.h"
	#include "content/shell/browser/shell.h"
	#include "content/test/accessibility_browser_test_utils.h"
	#include "ui/accessibility/ax_node.h"
	#include "ui/accessibility/ax_tree.h"

	#if defined(OS_WIN)
	#include <atlbase.h>
	#include <atlcom.h>
	#include "base/win/scoped_com_initializer.h"
	#include "ui/base/win/atl_module.h"
	#endif

	// TODO(dmazzoni): Disabled accessibility tests on Win64. crbug.com/179717
	#if defined(OS_WIN) && defined(ARCH_CPU_X86_64)
	#define MAYBE_TableSpan DISABLED_TableSpan
	#else
	#define MAYBE_TableSpan TableSpan
	#endif

	namespace content {

	class CrossPlatformAccessibilityBrowserTest : public ContentBrowserTest {
	public:
	CrossPlatformAccessibilityBrowserTest() {}

	// Tell the renderer to send an accessibility tree, then wait for the
	// notification that it's been received.
	const ui::AXTree& GetAXTree(
	AccessibilityMode accessibility_mode = AccessibilityModeComplete) {
	AccessibilityNotificationWaiter waiter(
	shell(), accessibility_mode, ui::AX_EVENT_LAYOUT_COMPLETE);
	waiter.WaitForNotification();
	return waiter.GetAXTree();
	}

	// Make sure each node in the tree has a unique id.
	void RecursiveAssertUniqueIds(
	const ui::AXNode* node, base::hash_set<int>* ids) {
	ASSERT_TRUE(ids->find(node->id()) == ids->end());
	ids->insert(node->id());
	for (int i = 0; i < node->child_count(); i++)
	RecursiveAssertUniqueIds(node->ChildAtIndex(i), ids);
	}

	// ContentBrowserTest
	void SetUpInProcessBrowserTestFixture() override;
	void TearDownInProcessBrowserTestFixture() override;

	protected:
	std::string GetAttr(const ui::AXNode* node,
	const ui::AXStringAttribute attr);
	int GetIntAttr(const ui::AXNode* node,
	const ui::AXIntAttribute attr);
	bool GetBoolAttr(const ui::AXNode* node,
	const ui::AXBoolAttribute attr);

	private:
	#if defined(OS_WIN)
	scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_;
	#endif

	DISALLOW_COPY_AND_ASSIGN(CrossPlatformAccessibilityBrowserTest);
	};

	void CrossPlatformAccessibilityBrowserTest::SetUpInProcessBrowserTestFixture() {
	#if defined(OS_WIN)
	ui::win::CreateATLModuleIfNeeded();
	com_initializer_.reset(new base::win::ScopedCOMInitializer());
	#endif
	}

	void
	CrossPlatformAccessibilityBrowserTest::TearDownInProcessBrowserTestFixture() {
	#if defined(OS_WIN)
	com_initializer_.reset();
	#endif
	}

	// Convenience method to get the value of a particular AXNode
	// attribute as a UTF-8 string.
	std::string CrossPlatformAccessibilityBrowserTest::GetAttr(
	const ui::AXNode* node,
	const ui::AXStringAttribute attr) {
	const ui::AXNodeData& data = node->data();
	for (size_t i = 0; i < data.string_attributes.size(); ++i) {
	if (data.string_attributes[i].first == attr)
	return data.string_attributes[i].second;
	}
	return std::string();
	}

	// Convenience method to get the value of a particular AXNode
	// integer attribute.
	int CrossPlatformAccessibilityBrowserTest::GetIntAttr(
	const ui::AXNode* node,
	const ui::AXIntAttribute attr) {
	const ui::AXNodeData& data = node->data();
	for (size_t i = 0; i < data.int_attributes.size(); ++i) {
	if (data.int_attributes[i].first == attr)
	return data.int_attributes[i].second;
	}
	return -1;
	}

	// Convenience method to get the value of a particular AXNode
	// boolean attribute.
	bool CrossPlatformAccessibilityBrowserTest::GetBoolAttr(
	const ui::AXNode* node,
	const ui::AXBoolAttribute attr) {
	const ui::AXNodeData& data = node->data();
	for (size_t i = 0; i < data.bool_attributes.size(); ++i) {
	if (data.bool_attributes[i].first == attr)
	return data.bool_attributes[i].second;
	}
	return false;
	}

	// Marked flaky per http://crbug.com/101984
	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	DISABLED_WebpageAccessibility) {
	// Create a data url and load it.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<html><head><title>Accessibility Test</title></head>"
	"<body><input type='button' value='push' /><input type='checkbox' />"
	"</body></html>";
	GURL url(url_str);
	NavigateToURL(shell(), url);
	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();

	// Check properties of thet tree.
	EXPECT_STREQ(url_str, tree.data().url.c_str());
	EXPECT_STREQ("Accessibility Test", tree.data().title.c_str());
	EXPECT_STREQ("html", tree.data().doctype.c_str());
	EXPECT_STREQ("text/html", tree.data().mimetype.c_str());

	// Check properties of the root element of the tree.
	EXPECT_STREQ(
	"Accessibility Test",
	GetAttr(root, ui::AX_ATTR_NAME).c_str());
	EXPECT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, root->data().role);

	// Check properties of the BODY element.
	ASSERT_EQ(1, root->child_count());
	const ui::AXNode* body = root->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_GROUP, body->data().role);
	EXPECT_STREQ("body",
	GetAttr(body, ui::AX_ATTR_HTML_TAG).c_str());
	EXPECT_STREQ("block",
	GetAttr(body, ui::AX_ATTR_DISPLAY).c_str());

	// Check properties of the two children of the BODY element.
	ASSERT_EQ(2, body->child_count());

	const ui::AXNode* button = body->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_BUTTON, button->data().role);
	EXPECT_STREQ(
	"input", GetAttr(button, ui::AX_ATTR_HTML_TAG).c_str());
	EXPECT_STREQ(
	"push",
	GetAttr(button, ui::AX_ATTR_NAME).c_str());
	EXPECT_STREQ(
	"inline-block",
	GetAttr(button, ui::AX_ATTR_DISPLAY).c_str());
	ASSERT_EQ(2U, button->data().html_attributes.size());
	EXPECT_STREQ("type", button->data().html_attributes[0].first.c_str());
	EXPECT_STREQ("button", button->data().html_attributes[0].second.c_str());
	EXPECT_STREQ("value", button->data().html_attributes[1].first.c_str());
	EXPECT_STREQ("push", button->data().html_attributes[1].second.c_str());

	const ui::AXNode* checkbox = body->ChildAtIndex(1);
	EXPECT_EQ(ui::AX_ROLE_CHECK_BOX, checkbox->data().role);
	EXPECT_STREQ(
	"input", GetAttr(checkbox, ui::AX_ATTR_HTML_TAG).c_str());
	EXPECT_STREQ(
	"inline-block",
	GetAttr(checkbox, ui::AX_ATTR_DISPLAY).c_str());
	ASSERT_EQ(1U, checkbox->data().html_attributes.size());
	EXPECT_STREQ("type", checkbox->data().html_attributes[0].first.c_str());
	EXPECT_STREQ("checkbox", checkbox->data().html_attributes[0].second.c_str());
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	UnselectedEditableTextAccessibility) {
	// Create a data url and load it.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<body>"
	"<input value=\"Hello, world.\"/>"
	"</body></html>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	ASSERT_EQ(1, root->child_count());
	const ui::AXNode* body = root->ChildAtIndex(0);
	ASSERT_EQ(1, body->child_count());
	const ui::AXNode* text = body->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, text->data().role);
	EXPECT_STREQ(
	"input", GetAttr(text, ui::AX_ATTR_HTML_TAG).c_str());
	EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_START));
	EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_END));
	EXPECT_STREQ(
	"Hello, world.",
	GetAttr(text, ui::AX_ATTR_VALUE).c_str());

	// TODO(dmazzoni): as soon as more accessibility code is cross-platform,
	// this code should test that the accessible info is dynamically updated
	// if the selection or value changes.
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	SelectedEditableTextAccessibility) {
	// Create a data url and load it.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<body onload=\"document.body.children[0].select();\">"
	"<input value=\"Hello, world.\"/>"
	"</body></html>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	ASSERT_EQ(1, root->child_count());
	const ui::AXNode* body = root->ChildAtIndex(0);
	ASSERT_EQ(1, body->child_count());
	const ui::AXNode* text = body->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, text->data().role);
	EXPECT_STREQ(
	"input", GetAttr(text, ui::AX_ATTR_HTML_TAG).c_str());
	EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_START));
	EXPECT_EQ(13, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_END));
	EXPECT_STREQ(
	"Hello, world.",
	GetAttr(text, ui::AX_ATTR_VALUE).c_str());
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	MultipleInheritanceAccessibility) {
	// In a WebKit accessibility render tree for a table, each cell is a
	// child of both a row and a column, so it appears to use multiple
	// inheritance. Make sure that the ui::AXNodeDataObject tree only
	// keeps one copy of each cell, and uses an indirect child id for the
	// additional reference to it.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<table border=1><tr><td>1</td><td>2</td></tr></table>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	ASSERT_EQ(1, root->child_count());
	const ui::AXNode* table = root->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_TABLE, table->data().role);
	const ui::AXNode* row = table->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_ROW, row->data().role);
	const ui::AXNode* cell1 = row->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_CELL, cell1->data().role);
	const ui::AXNode* cell2 = row->ChildAtIndex(1);
	EXPECT_EQ(ui::AX_ROLE_CELL, cell2->data().role);
	const ui::AXNode* column1 = table->ChildAtIndex(1);
	EXPECT_EQ(ui::AX_ROLE_COLUMN, column1->data().role);
	EXPECT_EQ(0, column1->child_count());
	EXPECT_EQ(1U, column1->data().intlist_attributes.size());
	EXPECT_EQ(ui::AX_ATTR_INDIRECT_CHILD_IDS,
	column1->data().intlist_attributes[0].first);
	const std::vector<int32> column1_indirect_child_ids =
	column1->data().intlist_attributes[0].second;
	EXPECT_EQ(1U, column1_indirect_child_ids.size());
	EXPECT_EQ(cell1->id(), column1_indirect_child_ids[0]);
	const ui::AXNode* column2 = table->ChildAtIndex(2);
	EXPECT_EQ(ui::AX_ROLE_COLUMN, column2->data().role);
	EXPECT_EQ(0, column2->child_count());
	EXPECT_EQ(ui::AX_ATTR_INDIRECT_CHILD_IDS,
	column2->data().intlist_attributes[0].first);
	const std::vector<int32> column2_indirect_child_ids =
	column2->data().intlist_attributes[0].second;
	EXPECT_EQ(1U, column2_indirect_child_ids.size());
	EXPECT_EQ(cell2->id(), column2_indirect_child_ids[0]);
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	MultipleInheritanceAccessibility2) {
	// Here's another html snippet where WebKit puts the same node as a child
	// of two different parents. Instead of checking the exact output, just
	// make sure that no id is reused in the resulting tree.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<script>\n"
	" document.writeln('<q><section></section></q><q><li>');\n"
	" setTimeout(function() {\n"
	" document.close();\n"
	" }, 1);\n"
	"</script>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	base::hash_set<int> ids;
	RecursiveAssertUniqueIds(root, &ids);
	}

	// TODO(dmazzoni): Needs to be rebaselined. http://crbug.com/347464
	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	DISABLED_IframeAccessibility) {
	// Create a data url and load it.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html><html><body>"
	"<button>Button 1</button>"
	"<iframe src='data:text/html,"
	"<!doctype html><html><body><button>Button 2</button></body></html>"
	"'></iframe>"
	"<button>Button 3</button>"
	"</body></html>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	ASSERT_EQ(1, root->child_count());
	const ui::AXNode* body = root->ChildAtIndex(0);
	ASSERT_EQ(3, body->child_count());

	const ui::AXNode* button1 = body->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_BUTTON, button1->data().role);
	EXPECT_STREQ(
	"Button 1",
	GetAttr(button1, ui::AX_ATTR_NAME).c_str());

	const ui::AXNode* iframe = body->ChildAtIndex(1);
	EXPECT_STREQ("iframe",
	GetAttr(iframe, ui::AX_ATTR_HTML_TAG).c_str());
	ASSERT_EQ(1, iframe->child_count());

	const ui::AXNode* scroll_area = iframe->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_SCROLL_AREA, scroll_area->data().role);
	ASSERT_EQ(1, scroll_area->child_count());

	const ui::AXNode* sub_document = scroll_area->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_WEB_AREA, sub_document->data().role);
	ASSERT_EQ(1, sub_document->child_count());

	const ui::AXNode* sub_body = sub_document->ChildAtIndex(0);
	ASSERT_EQ(1, sub_body->child_count());

	const ui::AXNode* button2 = sub_body->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_BUTTON, button2->data().role);
	EXPECT_STREQ("Button 2",
	GetAttr(button2, ui::AX_ATTR_NAME).c_str());

	const ui::AXNode* button3 = body->ChildAtIndex(2);
	EXPECT_EQ(ui::AX_ROLE_BUTTON, button3->data().role);
	EXPECT_STREQ("Button 3",
	GetAttr(button3, ui::AX_ATTR_NAME).c_str());
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	DuplicateChildrenAccessibility) {
	// Here's another html snippet where WebKit has a parent node containing
	// two duplicate child nodes. Instead of checking the exact output, just
	// make sure that no id is reused in the resulting tree.
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<em><code ><h4 ></em>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	base::hash_set<int> ids;
	RecursiveAssertUniqueIds(root, &ids);
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	MAYBE_TableSpan) {
	// +---+---+---+
	// \| 1 \| 2 \|
	// +---+---+---+
	// \| 3 \| 4 \|
	// +---+---+---+

	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<table border=1>"
	" <tr>"
	" <td colspan=2>1</td><td>2</td>"
	" </tr>"
	" <tr>"
	" <td>3</td><td colspan=2>4</td>"
	" </tr>"
	"</table>";
	GURL url(url_str);
	NavigateToURL(shell(), url);

	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	const ui::AXNode* table = root->ChildAtIndex(0);
	EXPECT_EQ(ui::AX_ROLE_TABLE, table->data().role);
	ASSERT_GE(table->child_count(), 5);
	EXPECT_EQ(ui::AX_ROLE_ROW, table->ChildAtIndex(0)->data().role);
	EXPECT_EQ(ui::AX_ROLE_ROW, table->ChildAtIndex(1)->data().role);
	EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(2)->data().role);
	EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(3)->data().role);
	EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(4)->data().role);
	EXPECT_EQ(3,
	GetIntAttr(table, ui::AX_ATTR_TABLE_COLUMN_COUNT));
	EXPECT_EQ(2, GetIntAttr(table, ui::AX_ATTR_TABLE_ROW_COUNT));

	const ui::AXNode* cell1 = table->ChildAtIndex(0)->ChildAtIndex(0);
	const ui::AXNode* cell2 = table->ChildAtIndex(0)->ChildAtIndex(1);
	const ui::AXNode* cell3 = table->ChildAtIndex(1)->ChildAtIndex(0);
	const ui::AXNode* cell4 = table->ChildAtIndex(1)->ChildAtIndex(1);

	ASSERT_EQ(ui::AX_ATTR_CELL_IDS,
	table->data().intlist_attributes[0].first);
	const std::vector<int32>& table_cell_ids =
	table->data().intlist_attributes[0].second;
	ASSERT_EQ(6U, table_cell_ids.size());
	EXPECT_EQ(cell1->id(), table_cell_ids[0]);
	EXPECT_EQ(cell1->id(), table_cell_ids[1]);
	EXPECT_EQ(cell2->id(), table_cell_ids[2]);
	EXPECT_EQ(cell3->id(), table_cell_ids[3]);
	EXPECT_EQ(cell4->id(), table_cell_ids[4]);
	EXPECT_EQ(cell4->id(), table_cell_ids[5]);

	EXPECT_EQ(0, GetIntAttr(cell1,
	ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
	EXPECT_EQ(0, GetIntAttr(cell1,
	ui::AX_ATTR_TABLE_CELL_ROW_INDEX));
	EXPECT_EQ(2, GetIntAttr(cell1,
	ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
	EXPECT_EQ(1, GetIntAttr(cell1,
	ui::AX_ATTR_TABLE_CELL_ROW_SPAN));
	EXPECT_EQ(2, GetIntAttr(cell2,
	ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
	EXPECT_EQ(1, GetIntAttr(cell2,
	ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
	EXPECT_EQ(0, GetIntAttr(cell3,
	ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
	EXPECT_EQ(1, GetIntAttr(cell3,
	ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
	EXPECT_EQ(1, GetIntAttr(cell4,
	ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
	EXPECT_EQ(2, GetIntAttr(cell4,
	ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
	}

	IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
	WritableElement) {
	const char url_str[] =
	"data:text/html,"
	"<!doctype html>"
	"<div role='textbox' tabindex=0>"
	" Some text"
	"</div>";
	GURL url(url_str);
	NavigateToURL(shell(), url);
	const ui::AXTree& tree = GetAXTree();
	const ui::AXNode* root = tree.root();
	ASSERT_EQ(1, root->child_count());
	const ui::AXNode* textbox = root->ChildAtIndex(0);
	EXPECT_EQ(true, GetBoolAttr(textbox, ui::AX_ATTR_CAN_SET_VALUE));
	}

	} // namespace content