chrome/browser/accessibility/renderer_accessibility_browsertest.cc - platform/external/chromium - Git at Google

 // Copyright (c) 2011 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/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/test/in_process_browser_test.h"
 #include "chrome/test/ui_test_utils.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/renderer_host/render_widget_host.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/common/notification_type.h"

 #if defined(OS_WIN)
 #include <atlbase.h>
 #include <atlcom.h>
 #endif

 using webkit_glue::WebAccessibility;

 namespace {

 class RendererAccessibilityBrowserTest : public InProcessBrowserTest {
  public:
   RendererAccessibilityBrowserTest() {}

   // Tell the renderer to send an accessibility tree, then wait for the
   // notification that it's been received.
   const WebAccessibility& GetWebAccessibilityTree() {
     RenderWidgetHostView* host_view =
         browser()->GetSelectedTabContents()->GetRenderWidgetHostView();
     RenderWidgetHost* host = host_view->GetRenderWidgetHost();
     RenderViewHost* view_host = static_cast<RenderViewHost*>(host);
     view_host->set_save_accessibility_tree_for_testing(true);
     view_host->EnableRendererAccessibility();
     ui_test_utils::WaitForNotification(
         NotificationType::RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED);
     return view_host->accessibility_tree();
   }

   // Make sure each node in the tree has an unique id.
   void RecursiveAssertUniqueIds(
       const WebAccessibility& node, base::hash_set<int>* ids) {
     ASSERT_TRUE(ids->find(node.id) == ids->end());
     ids->insert(node.id);
     for (size_t i = 0; i < node.children.size(); i++)
       RecursiveAssertUniqueIds(node.children[i], ids);
   }

   // InProcessBrowserTest
   void SetUpInProcessBrowserTestFixture();
   void TearDownInProcessBrowserTestFixture();

  protected:
   std::string GetAttr(const WebAccessibility& node,
                       const WebAccessibility::Attribute attr);
 };

 void RendererAccessibilityBrowserTest::SetUpInProcessBrowserTestFixture() {
 #if defined(OS_WIN)
   // ATL needs a pointer to a COM module.
   static CComModule module;
   _pAtlModule = &module;

   // Make sure COM is initialized for this thread; it's safe to call twice.
   ::CoInitialize(NULL);
 #endif
 }

 void RendererAccessibilityBrowserTest::TearDownInProcessBrowserTestFixture() {
 #if defined(OS_WIN)
   ::CoUninitialize();
 #endif
 }

 // Convenience method to get the value of a particular WebAccessibility
 // node attribute as a UTF-8 const char*.
 std::string RendererAccessibilityBrowserTest::GetAttr(
     const WebAccessibility& node, const WebAccessibility::Attribute attr) {
   std::map<int32, string16>::const_iterator iter = node.attributes.find(attr);
   if (iter != node.attributes.end())
     return UTF16ToUTF8(iter->second);
   else
     return "";
 }

 IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
                        CrossPlatformWebpageAccessibility) {
   // 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);
   const WebAccessibility& tree = GetWebAccessibilityTree();

   // Check properties of the root element of the tree.
   EXPECT_STREQ(url_str, GetAttr(tree, WebAccessibility::ATTR_DOC_URL).c_str());
   EXPECT_STREQ(
       "Accessibility Test",
       GetAttr(tree, WebAccessibility::ATTR_DOC_TITLE).c_str());
   EXPECT_STREQ(
       "html", GetAttr(tree, WebAccessibility::ATTR_DOC_DOCTYPE).c_str());
   EXPECT_STREQ(
       "text/html", GetAttr(tree, WebAccessibility::ATTR_DOC_MIMETYPE).c_str());
   EXPECT_STREQ("Accessibility Test", UTF16ToUTF8(tree.name).c_str());
   EXPECT_EQ(WebAccessibility::ROLE_WEB_AREA, tree.role);

   // Check properites of the BODY element.
   ASSERT_EQ(1U, tree.children.size());
   const WebAccessibility& body = tree.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_GROUP, body.role);
   EXPECT_STREQ("body", GetAttr(body, WebAccessibility::ATTR_HTML_TAG).c_str());
   EXPECT_STREQ("block", GetAttr(body, WebAccessibility::ATTR_DISPLAY).c_str());

   // Check properties of the two children of the BODY element.
   ASSERT_EQ(2U, body.children.size());

   const WebAccessibility& button = body.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button.role);
   EXPECT_STREQ(
       "input", GetAttr(button, WebAccessibility::ATTR_HTML_TAG).c_str());
   EXPECT_STREQ("push", UTF16ToUTF8(button.name).c_str());
   EXPECT_STREQ(
       "inline-block", GetAttr(button, WebAccessibility::ATTR_DISPLAY).c_str());
   ASSERT_EQ(2U, button.html_attributes.size());
   EXPECT_STREQ("type", UTF16ToUTF8(button.html_attributes[0].first).c_str());
   EXPECT_STREQ("button", UTF16ToUTF8(button.html_attributes[0].second).c_str());
   EXPECT_STREQ("value", UTF16ToUTF8(button.html_attributes[1].first).c_str());
   EXPECT_STREQ("push", UTF16ToUTF8(button.html_attributes[1].second).c_str());

   const WebAccessibility& checkbox = body.children[1];
   EXPECT_EQ(WebAccessibility::ROLE_CHECKBOX, checkbox.role);
   EXPECT_STREQ(
       "input", GetAttr(checkbox, WebAccessibility::ATTR_HTML_TAG).c_str());
   EXPECT_STREQ(
       "inline-block",
       GetAttr(checkbox, WebAccessibility::ATTR_DISPLAY).c_str());
   ASSERT_EQ(1U, checkbox.html_attributes.size());
   EXPECT_STREQ(
       "type", UTF16ToUTF8(checkbox.html_attributes[0].first).c_str());
   EXPECT_STREQ(
     "checkbox", UTF16ToUTF8(checkbox.html_attributes[0].second).c_str());
 }

 IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
                        CrossPlatformUnselectedEditableTextAccessibility) {
   // 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

   const WebAccessibility& tree = GetWebAccessibilityTree();
   ASSERT_EQ(1U, tree.children.size());
   const WebAccessibility& body = tree.children[0];
   ASSERT_EQ(1U, body.children.size());
   const WebAccessibility& text = body.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_TEXT_FIELD, text.role);
   EXPECT_STREQ(
       "input", GetAttr(text, WebAccessibility::ATTR_HTML_TAG).c_str());
   EXPECT_STREQ(
       "0", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_START).c_str());
   EXPECT_STREQ(
       "0", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_END).c_str());
   EXPECT_STREQ("Hello, world.", UTF16ToUTF8(text.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(RendererAccessibilityBrowserTest,
                        CrossPlatformSelectedEditableTextAccessibility) {
   // 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

   const WebAccessibility& tree = GetWebAccessibilityTree();
   ASSERT_EQ(1U, tree.children.size());
   const WebAccessibility& body = tree.children[0];
   ASSERT_EQ(1U, body.children.size());
   const WebAccessibility& text = body.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_TEXT_FIELD, text.role);
   EXPECT_STREQ(
       "input", GetAttr(text, WebAccessibility::ATTR_HTML_TAG).c_str());
   EXPECT_STREQ(
       "0", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_START).c_str());
   EXPECT_STREQ(
       "13", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_END).c_str());
   EXPECT_STREQ("Hello, world.", UTF16ToUTF8(text.value).c_str());
 }

 IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
                        CrossPlatformMultipleInheritanceAccessibility) {
   // 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 WebAccessibilityObject 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

   const WebAccessibility& tree = GetWebAccessibilityTree();
   ASSERT_EQ(1U, tree.children.size());
   const WebAccessibility& table = tree.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_TABLE, table.role);
   const WebAccessibility& row = table.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_ROW, row.role);
   const WebAccessibility& cell1 = row.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_CELL, cell1.role);
   const WebAccessibility& cell2 = row.children[1];
   EXPECT_EQ(WebAccessibility::ROLE_CELL, cell2.role);
   const WebAccessibility& column1 = table.children[1];
   EXPECT_EQ(WebAccessibility::ROLE_COLUMN, column1.role);
   EXPECT_EQ(0U, column1.children.size());
   EXPECT_EQ(1U, column1.indirect_child_ids.size());
   EXPECT_EQ(cell1.id, column1.indirect_child_ids[0]);
   const WebAccessibility& column2 = table.children[2];
   EXPECT_EQ(WebAccessibility::ROLE_COLUMN, column2.role);
   EXPECT_EQ(0U, column2.children.size());
   EXPECT_EQ(1U, column2.indirect_child_ids.size());
   EXPECT_EQ(cell2.id, column2.indirect_child_ids[0]);
 }

 IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
                        CrossPlatformMultipleInheritanceAccessibility2) {
   // 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

   const WebAccessibility& tree = GetWebAccessibilityTree();
   base::hash_set<int> ids;
   RecursiveAssertUniqueIds(tree, &ids);
 }

 IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
                        CrossPlatformIframeAccessibility) {
   // 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

   const WebAccessibility& tree = GetWebAccessibilityTree();
   ASSERT_EQ(1U, tree.children.size());
   const WebAccessibility& body = tree.children[0];
   ASSERT_EQ(3U, body.children.size());

   const WebAccessibility& button1 = body.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button1.role);
   EXPECT_STREQ("Button 1", UTF16ToUTF8(button1.name).c_str());

   const WebAccessibility& iframe = body.children[1];
   EXPECT_STREQ("iframe",
                GetAttr(iframe, WebAccessibility::ATTR_HTML_TAG).c_str());
   ASSERT_EQ(1U, iframe.children.size());

   const WebAccessibility& scroll_area = iframe.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_SCROLLAREA, scroll_area.role);
   ASSERT_EQ(1U, scroll_area.children.size());

   const WebAccessibility& sub_document = scroll_area.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_WEB_AREA, sub_document.role);
   ASSERT_EQ(1U, sub_document.children.size());

   const WebAccessibility& sub_body = sub_document.children[0];
   ASSERT_EQ(1U, sub_body.children.size());

   const WebAccessibility& button2 = sub_body.children[0];
   EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button2.role);
   EXPECT_STREQ("Button 2", UTF16ToUTF8(button2.name).c_str());

   const WebAccessibility& button3 = body.children[2];
   EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button3.role);
   EXPECT_STREQ("Button 3", UTF16ToUTF8(button3.name).c_str());
 }

 IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
                        CrossPlatformDuplicateChildrenAccessibility) {
   // 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);
   browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

   const WebAccessibility& tree = GetWebAccessibilityTree();
   base::hash_set<int> ids;
   RecursiveAssertUniqueIds(tree, &ids);
 }

 }  // namespace
	// Copyright (c) 2011 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/utf_string_conversions.h"
	#include "chrome/browser/ui/browser.h"
	#include "chrome/browser/ui/browser_window.h"
	#include "chrome/common/render_messages.h"
	#include "chrome/test/in_process_browser_test.h"
	#include "chrome/test/ui_test_utils.h"
	#include "content/browser/renderer_host/render_view_host.h"
	#include "content/browser/renderer_host/render_widget_host.h"
	#include "content/browser/renderer_host/render_widget_host_view.h"
	#include "content/browser/tab_contents/tab_contents.h"
	#include "content/common/notification_type.h"

	#if defined(OS_WIN)
	#include <atlbase.h>
	#include <atlcom.h>
	#endif

	using webkit_glue::WebAccessibility;

	namespace {

	class RendererAccessibilityBrowserTest : public InProcessBrowserTest {
	public:
	RendererAccessibilityBrowserTest() {}

	// Tell the renderer to send an accessibility tree, then wait for the
	// notification that it's been received.
	const WebAccessibility& GetWebAccessibilityTree() {
	RenderWidgetHostView* host_view =
	browser()->GetSelectedTabContents()->GetRenderWidgetHostView();
	RenderWidgetHost* host = host_view->GetRenderWidgetHost();
	RenderViewHost* view_host = static_cast<RenderViewHost*>(host);
	view_host->set_save_accessibility_tree_for_testing(true);
	view_host->EnableRendererAccessibility();
	ui_test_utils::WaitForNotification(
	NotificationType::RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED);
	return view_host->accessibility_tree();
	}

	// Make sure each node in the tree has an unique id.
	void RecursiveAssertUniqueIds(
	const WebAccessibility& node, base::hash_set<int>* ids) {
	ASSERT_TRUE(ids->find(node.id) == ids->end());
	ids->insert(node.id);
	for (size_t i = 0; i < node.children.size(); i++)
	RecursiveAssertUniqueIds(node.children[i], ids);
	}

	// InProcessBrowserTest
	void SetUpInProcessBrowserTestFixture();
	void TearDownInProcessBrowserTestFixture();

	protected:
	std::string GetAttr(const WebAccessibility& node,
	const WebAccessibility::Attribute attr);
	};

	void RendererAccessibilityBrowserTest::SetUpInProcessBrowserTestFixture() {
	#if defined(OS_WIN)
	// ATL needs a pointer to a COM module.
	static CComModule module;
	_pAtlModule = &module;

	// Make sure COM is initialized for this thread; it's safe to call twice.
	::CoInitialize(NULL);
	#endif
	}

	void RendererAccessibilityBrowserTest::TearDownInProcessBrowserTestFixture() {
	#if defined(OS_WIN)
	::CoUninitialize();
	#endif
	}

	// Convenience method to get the value of a particular WebAccessibility
	// node attribute as a UTF-8 const char*.
	std::string RendererAccessibilityBrowserTest::GetAttr(
	const WebAccessibility& node, const WebAccessibility::Attribute attr) {
	std::map<int32, string16>::const_iterator iter = node.attributes.find(attr);
	if (iter != node.attributes.end())
	return UTF16ToUTF8(iter->second);
	else
	return "";
	}

	IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
	CrossPlatformWebpageAccessibility) {
	// 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);
	const WebAccessibility& tree = GetWebAccessibilityTree();

	// Check properties of the root element of the tree.
	EXPECT_STREQ(url_str, GetAttr(tree, WebAccessibility::ATTR_DOC_URL).c_str());
	EXPECT_STREQ(
	"Accessibility Test",
	GetAttr(tree, WebAccessibility::ATTR_DOC_TITLE).c_str());
	EXPECT_STREQ(
	"html", GetAttr(tree, WebAccessibility::ATTR_DOC_DOCTYPE).c_str());
	EXPECT_STREQ(
	"text/html", GetAttr(tree, WebAccessibility::ATTR_DOC_MIMETYPE).c_str());
	EXPECT_STREQ("Accessibility Test", UTF16ToUTF8(tree.name).c_str());
	EXPECT_EQ(WebAccessibility::ROLE_WEB_AREA, tree.role);

	// Check properites of the BODY element.
	ASSERT_EQ(1U, tree.children.size());
	const WebAccessibility& body = tree.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_GROUP, body.role);
	EXPECT_STREQ("body", GetAttr(body, WebAccessibility::ATTR_HTML_TAG).c_str());
	EXPECT_STREQ("block", GetAttr(body, WebAccessibility::ATTR_DISPLAY).c_str());

	// Check properties of the two children of the BODY element.
	ASSERT_EQ(2U, body.children.size());

	const WebAccessibility& button = body.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button.role);
	EXPECT_STREQ(
	"input", GetAttr(button, WebAccessibility::ATTR_HTML_TAG).c_str());
	EXPECT_STREQ("push", UTF16ToUTF8(button.name).c_str());
	EXPECT_STREQ(
	"inline-block", GetAttr(button, WebAccessibility::ATTR_DISPLAY).c_str());
	ASSERT_EQ(2U, button.html_attributes.size());
	EXPECT_STREQ("type", UTF16ToUTF8(button.html_attributes[0].first).c_str());
	EXPECT_STREQ("button", UTF16ToUTF8(button.html_attributes[0].second).c_str());
	EXPECT_STREQ("value", UTF16ToUTF8(button.html_attributes[1].first).c_str());
	EXPECT_STREQ("push", UTF16ToUTF8(button.html_attributes[1].second).c_str());

	const WebAccessibility& checkbox = body.children[1];
	EXPECT_EQ(WebAccessibility::ROLE_CHECKBOX, checkbox.role);
	EXPECT_STREQ(
	"input", GetAttr(checkbox, WebAccessibility::ATTR_HTML_TAG).c_str());
	EXPECT_STREQ(
	"inline-block",
	GetAttr(checkbox, WebAccessibility::ATTR_DISPLAY).c_str());
	ASSERT_EQ(1U, checkbox.html_attributes.size());
	EXPECT_STREQ(
	"type", UTF16ToUTF8(checkbox.html_attributes[0].first).c_str());
	EXPECT_STREQ(
	"checkbox", UTF16ToUTF8(checkbox.html_attributes[0].second).c_str());
	}

	IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
	CrossPlatformUnselectedEditableTextAccessibility) {
	// 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

	const WebAccessibility& tree = GetWebAccessibilityTree();
	ASSERT_EQ(1U, tree.children.size());
	const WebAccessibility& body = tree.children[0];
	ASSERT_EQ(1U, body.children.size());
	const WebAccessibility& text = body.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_TEXT_FIELD, text.role);
	EXPECT_STREQ(
	"input", GetAttr(text, WebAccessibility::ATTR_HTML_TAG).c_str());
	EXPECT_STREQ(
	"0", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_START).c_str());
	EXPECT_STREQ(
	"0", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_END).c_str());
	EXPECT_STREQ("Hello, world.", UTF16ToUTF8(text.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(RendererAccessibilityBrowserTest,
	CrossPlatformSelectedEditableTextAccessibility) {
	// 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

	const WebAccessibility& tree = GetWebAccessibilityTree();
	ASSERT_EQ(1U, tree.children.size());
	const WebAccessibility& body = tree.children[0];
	ASSERT_EQ(1U, body.children.size());
	const WebAccessibility& text = body.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_TEXT_FIELD, text.role);
	EXPECT_STREQ(
	"input", GetAttr(text, WebAccessibility::ATTR_HTML_TAG).c_str());
	EXPECT_STREQ(
	"0", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_START).c_str());
	EXPECT_STREQ(
	"13", GetAttr(text, WebAccessibility::ATTR_TEXT_SEL_END).c_str());
	EXPECT_STREQ("Hello, world.", UTF16ToUTF8(text.value).c_str());
	}

	IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
	CrossPlatformMultipleInheritanceAccessibility) {
	// 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 WebAccessibilityObject 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

	const WebAccessibility& tree = GetWebAccessibilityTree();
	ASSERT_EQ(1U, tree.children.size());
	const WebAccessibility& table = tree.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_TABLE, table.role);
	const WebAccessibility& row = table.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_ROW, row.role);
	const WebAccessibility& cell1 = row.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_CELL, cell1.role);
	const WebAccessibility& cell2 = row.children[1];
	EXPECT_EQ(WebAccessibility::ROLE_CELL, cell2.role);
	const WebAccessibility& column1 = table.children[1];
	EXPECT_EQ(WebAccessibility::ROLE_COLUMN, column1.role);
	EXPECT_EQ(0U, column1.children.size());
	EXPECT_EQ(1U, column1.indirect_child_ids.size());
	EXPECT_EQ(cell1.id, column1.indirect_child_ids[0]);
	const WebAccessibility& column2 = table.children[2];
	EXPECT_EQ(WebAccessibility::ROLE_COLUMN, column2.role);
	EXPECT_EQ(0U, column2.children.size());
	EXPECT_EQ(1U, column2.indirect_child_ids.size());
	EXPECT_EQ(cell2.id, column2.indirect_child_ids[0]);
	}

	IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
	CrossPlatformMultipleInheritanceAccessibility2) {
	// 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

	const WebAccessibility& tree = GetWebAccessibilityTree();
	base::hash_set<int> ids;
	RecursiveAssertUniqueIds(tree, &ids);
	}

	IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
	CrossPlatformIframeAccessibility) {
	// 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

	const WebAccessibility& tree = GetWebAccessibilityTree();
	ASSERT_EQ(1U, tree.children.size());
	const WebAccessibility& body = tree.children[0];
	ASSERT_EQ(3U, body.children.size());

	const WebAccessibility& button1 = body.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button1.role);
	EXPECT_STREQ("Button 1", UTF16ToUTF8(button1.name).c_str());

	const WebAccessibility& iframe = body.children[1];
	EXPECT_STREQ("iframe",
	GetAttr(iframe, WebAccessibility::ATTR_HTML_TAG).c_str());
	ASSERT_EQ(1U, iframe.children.size());

	const WebAccessibility& scroll_area = iframe.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_SCROLLAREA, scroll_area.role);
	ASSERT_EQ(1U, scroll_area.children.size());

	const WebAccessibility& sub_document = scroll_area.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_WEB_AREA, sub_document.role);
	ASSERT_EQ(1U, sub_document.children.size());

	const WebAccessibility& sub_body = sub_document.children[0];
	ASSERT_EQ(1U, sub_body.children.size());

	const WebAccessibility& button2 = sub_body.children[0];
	EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button2.role);
	EXPECT_STREQ("Button 2", UTF16ToUTF8(button2.name).c_str());

	const WebAccessibility& button3 = body.children[2];
	EXPECT_EQ(WebAccessibility::ROLE_BUTTON, button3.role);
	EXPECT_STREQ("Button 3", UTF16ToUTF8(button3.name).c_str());
	}

	IN_PROC_BROWSER_TEST_F(RendererAccessibilityBrowserTest,
	CrossPlatformDuplicateChildrenAccessibility) {
	// 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);
	browser()->OpenURL(url, GURL(), CURRENT_TAB, PageTransition::TYPED);

	const WebAccessibility& tree = GetWebAccessibilityTree();
	base::hash_set<int> ids;
	RecursiveAssertUniqueIds(tree, &ids);
	}

	} // namespace