content/browser/accessibility/cross_platform_accessibility_browsertest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6 #include <vector>
   7
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "content/browser/renderer_host/render_view_host_impl.h"
  10 #include "content/public/browser/notification_service.h"
  11 #include "content/public/browser/notification_types.h"
  12 #include "content/public/browser/render_widget_host_view.h"
  13 #include "content/public/test/content_browser_test.h"
  14 #include "content/public/test/content_browser_test_utils.h"
  15 #include "content/shell/browser/shell.h"
  16 #include "content/test/accessibility_browser_test_utils.h"
  17 #include "ui/accessibility/ax_node.h"
  18 #include "ui/accessibility/ax_tree.h"
  19
  20 #if defined(OS_WIN)
  21 #include <atlbase.h>
  22 #include <atlcom.h>
  23 #include "base/win/scoped_com_initializer.h"
  24 #include "ui/base/win/atl_module.h"
  25 #endif
  26
  27 // TODO(dmazzoni): Disabled accessibility tests on Win64. crbug.com/179717
  28 #if defined(OS_WIN) && defined(ARCH_CPU_X86_64)
  29 #define MAYBE_TableSpan DISABLED_TableSpan
  30 #else
  31 #define MAYBE_TableSpan TableSpan
  32 #endif
  33
  34 namespace content {
  35
  36 class CrossPlatformAccessibilityBrowserTest : public ContentBrowserTest {
  37  public:
  38   CrossPlatformAccessibilityBrowserTest() {}
  39
  40   // Tell the renderer to send an accessibility tree, then wait for the
  41   // notification that it's been received.
  42   const ui::AXTree& GetAXTree(
  43       AccessibilityMode accessibility_mode = AccessibilityModeComplete) {
  44     AccessibilityNotificationWaiter waiter(
  45         shell(), accessibility_mode, ui::AX_EVENT_LAYOUT_COMPLETE);
  46     waiter.WaitForNotification();
  47     return waiter.GetAXTree();
  48   }
  49
  50   // Make sure each node in the tree has a unique id.
  51   void RecursiveAssertUniqueIds(
  52       const ui::AXNode* node, base::hash_set<int>* ids) {
  53     ASSERT_TRUE(ids->find(node->id()) == ids->end());
  54     ids->insert(node->id());
  55     for (int i = 0; i < node->child_count(); i++)
  56       RecursiveAssertUniqueIds(node->ChildAtIndex(i), ids);
  57   }
  58
  59   // ContentBrowserTest
  60   void SetUpInProcessBrowserTestFixture() override;
  61   void TearDownInProcessBrowserTestFixture() override;
  62
  63  protected:
  64   std::string GetAttr(const ui::AXNode* node,
  65                       const ui::AXStringAttribute attr);
  66   int GetIntAttr(const ui::AXNode* node,
  67                  const ui::AXIntAttribute attr);
  68   bool GetBoolAttr(const ui::AXNode* node,
  69                    const ui::AXBoolAttribute attr);
  70
  71  private:
  72 #if defined(OS_WIN)
  73   scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_;
  74 #endif
  75
  76   DISALLOW_COPY_AND_ASSIGN(CrossPlatformAccessibilityBrowserTest);
  77 };
  78
  79 void CrossPlatformAccessibilityBrowserTest::SetUpInProcessBrowserTestFixture() {
  80 #if defined(OS_WIN)
  81   ui::win::CreateATLModuleIfNeeded();
  82   com_initializer_.reset(new base::win::ScopedCOMInitializer());
  83 #endif
  84 }
  85
  86 void
  87 CrossPlatformAccessibilityBrowserTest::TearDownInProcessBrowserTestFixture() {
  88 #if defined(OS_WIN)
  89   com_initializer_.reset();
  90 #endif
  91 }
  92
  93 // Convenience method to get the value of a particular AXNode
  94 // attribute as a UTF-8 string.
  95 std::string CrossPlatformAccessibilityBrowserTest::GetAttr(
  96     const ui::AXNode* node,
  97     const ui::AXStringAttribute attr) {
  98   const ui::AXNodeData& data = node->data();
  99   for (size_t i = 0; i < data.string_attributes.size(); ++i) {
 100     if (data.string_attributes[i].first == attr)
 101       return data.string_attributes[i].second;
 102   }
 103   return std::string();
 104 }
 105
 106 // Convenience method to get the value of a particular AXNode
 107 // integer attribute.
 108 int CrossPlatformAccessibilityBrowserTest::GetIntAttr(
 109     const ui::AXNode* node,
 110     const ui::AXIntAttribute attr) {
 111   const ui::AXNodeData& data = node->data();
 112   for (size_t i = 0; i < data.int_attributes.size(); ++i) {
 113     if (data.int_attributes[i].first == attr)
 114       return data.int_attributes[i].second;
 115   }
 116   return -1;
 117 }
 118
 119 // Convenience method to get the value of a particular AXNode
 120 // boolean attribute.
 121 bool CrossPlatformAccessibilityBrowserTest::GetBoolAttr(
 122     const ui::AXNode* node,
 123     const ui::AXBoolAttribute attr) {
 124   const ui::AXNodeData& data = node->data();
 125   for (size_t i = 0; i < data.bool_attributes.size(); ++i) {
 126     if (data.bool_attributes[i].first == attr)
 127       return data.bool_attributes[i].second;
 128   }
 129   return false;
 130 }
 131
 132 // Marked flaky per http://crbug.com/101984
 133 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 134                        DISABLED_WebpageAccessibility) {
 135   // Create a data url and load it.
 136   const char url_str[] =
 137       "data:text/html,"
 138       "<!doctype html>"
 139       "<html><head><title>Accessibility Test</title></head>"
 140       "<body><input type='button' value='push' /><input type='checkbox' />"
 141       "</body></html>";
 142   GURL url(url_str);
 143   NavigateToURL(shell(), url);
 144   const ui::AXTree& tree = GetAXTree();
 145   const ui::AXNode* root = tree.root();
 146
 147   // Check properties of the root element of the tree.
 148   EXPECT_STREQ(url_str,
 149                GetAttr(root, ui::AX_ATTR_DOC_URL).c_str());
 150   EXPECT_STREQ(
 151       "Accessibility Test",
 152       GetAttr(root, ui::AX_ATTR_DOC_TITLE).c_str());
 153   EXPECT_STREQ(
 154       "html", GetAttr(root, ui::AX_ATTR_DOC_DOCTYPE).c_str());
 155   EXPECT_STREQ(
 156       "text/html",
 157       GetAttr(root, ui::AX_ATTR_DOC_MIMETYPE).c_str());
 158   EXPECT_STREQ(
 159       "Accessibility Test",
 160       GetAttr(root, ui::AX_ATTR_NAME).c_str());
 161   EXPECT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, root->data().role);
 162
 163   // Check properties of the BODY element.
 164   ASSERT_EQ(1, root->child_count());
 165   const ui::AXNode* body = root->ChildAtIndex(0);
 166   EXPECT_EQ(ui::AX_ROLE_GROUP, body->data().role);
 167   EXPECT_STREQ("body",
 168                GetAttr(body, ui::AX_ATTR_HTML_TAG).c_str());
 169   EXPECT_STREQ("block",
 170                GetAttr(body, ui::AX_ATTR_DISPLAY).c_str());
 171
 172   // Check properties of the two children of the BODY element.
 173   ASSERT_EQ(2, body->child_count());
 174
 175   const ui::AXNode* button = body->ChildAtIndex(0);
 176   EXPECT_EQ(ui::AX_ROLE_BUTTON, button->data().role);
 177   EXPECT_STREQ(
 178       "input", GetAttr(button, ui::AX_ATTR_HTML_TAG).c_str());
 179   EXPECT_STREQ(
 180       "push",
 181       GetAttr(button, ui::AX_ATTR_NAME).c_str());
 182   EXPECT_STREQ(
 183       "inline-block",
 184       GetAttr(button, ui::AX_ATTR_DISPLAY).c_str());
 185   ASSERT_EQ(2U, button->data().html_attributes.size());
 186   EXPECT_STREQ("type", button->data().html_attributes[0].first.c_str());
 187   EXPECT_STREQ("button", button->data().html_attributes[0].second.c_str());
 188   EXPECT_STREQ("value", button->data().html_attributes[1].first.c_str());
 189   EXPECT_STREQ("push", button->data().html_attributes[1].second.c_str());
 190
 191   const ui::AXNode* checkbox = body->ChildAtIndex(1);
 192   EXPECT_EQ(ui::AX_ROLE_CHECK_BOX, checkbox->data().role);
 193   EXPECT_STREQ(
 194       "input", GetAttr(checkbox, ui::AX_ATTR_HTML_TAG).c_str());
 195   EXPECT_STREQ(
 196       "inline-block",
 197       GetAttr(checkbox, ui::AX_ATTR_DISPLAY).c_str());
 198   ASSERT_EQ(1U, checkbox->data().html_attributes.size());
 199   EXPECT_STREQ("type", checkbox->data().html_attributes[0].first.c_str());
 200   EXPECT_STREQ("checkbox", checkbox->data().html_attributes[0].second.c_str());
 201 }
 202
 203 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 204                        UnselectedEditableTextAccessibility) {
 205   // Create a data url and load it.
 206   const char url_str[] =
 207       "data:text/html,"
 208       "<!doctype html>"
 209       "<body>"
 210       "<input value=\"Hello, world.\"/>"
 211       "</body></html>";
 212   GURL url(url_str);
 213   NavigateToURL(shell(), url);
 214
 215   const ui::AXTree& tree = GetAXTree();
 216   const ui::AXNode* root = tree.root();
 217   ASSERT_EQ(1, root->child_count());
 218   const ui::AXNode* body = root->ChildAtIndex(0);
 219   ASSERT_EQ(1, body->child_count());
 220   const ui::AXNode* text = body->ChildAtIndex(0);
 221   EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, text->data().role);
 222   EXPECT_STREQ(
 223       "input", GetAttr(text, ui::AX_ATTR_HTML_TAG).c_str());
 224   EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_START));
 225   EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_END));
 226   EXPECT_STREQ(
 227       "Hello, world.",
 228       GetAttr(text, ui::AX_ATTR_VALUE).c_str());
 229
 230   // TODO(dmazzoni): as soon as more accessibility code is cross-platform,
 231   // this code should test that the accessible info is dynamically updated
 232   // if the selection or value changes.
 233 }
 234
 235 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 236                        SelectedEditableTextAccessibility) {
 237   // Create a data url and load it.
 238   const char url_str[] =
 239       "data:text/html,"
 240       "<!doctype html>"
 241       "<body onload=\"document.body.children[0].select();\">"
 242       "<input value=\"Hello, world.\"/>"
 243       "</body></html>";
 244   GURL url(url_str);
 245   NavigateToURL(shell(), url);
 246
 247   const ui::AXTree& tree = GetAXTree();
 248   const ui::AXNode* root = tree.root();
 249   ASSERT_EQ(1, root->child_count());
 250   const ui::AXNode* body = root->ChildAtIndex(0);
 251   ASSERT_EQ(1, body->child_count());
 252   const ui::AXNode* text = body->ChildAtIndex(0);
 253   EXPECT_EQ(ui::AX_ROLE_TEXT_FIELD, text->data().role);
 254   EXPECT_STREQ(
 255       "input", GetAttr(text, ui::AX_ATTR_HTML_TAG).c_str());
 256   EXPECT_EQ(0, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_START));
 257   EXPECT_EQ(13, GetIntAttr(text, ui::AX_ATTR_TEXT_SEL_END));
 258   EXPECT_STREQ(
 259       "Hello, world.",
 260       GetAttr(text, ui::AX_ATTR_VALUE).c_str());
 261 }
 262
 263 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 264                        MultipleInheritanceAccessibility) {
 265   // In a WebKit accessibility render tree for a table, each cell is a
 266   // child of both a row and a column, so it appears to use multiple
 267   // inheritance. Make sure that the ui::AXNodeDataObject tree only
 268   // keeps one copy of each cell, and uses an indirect child id for the
 269   // additional reference to it.
 270   const char url_str[] =
 271       "data:text/html,"
 272       "<!doctype html>"
 273       "<table border=1><tr><td>1</td><td>2</td></tr></table>";
 274   GURL url(url_str);
 275   NavigateToURL(shell(), url);
 276
 277   const ui::AXTree& tree = GetAXTree();
 278   const ui::AXNode* root = tree.root();
 279   ASSERT_EQ(1, root->child_count());
 280   const ui::AXNode* table = root->ChildAtIndex(0);
 281   EXPECT_EQ(ui::AX_ROLE_TABLE, table->data().role);
 282   const ui::AXNode* row = table->ChildAtIndex(0);
 283   EXPECT_EQ(ui::AX_ROLE_ROW, row->data().role);
 284   const ui::AXNode* cell1 = row->ChildAtIndex(0);
 285   EXPECT_EQ(ui::AX_ROLE_CELL, cell1->data().role);
 286   const ui::AXNode* cell2 = row->ChildAtIndex(1);
 287   EXPECT_EQ(ui::AX_ROLE_CELL, cell2->data().role);
 288   const ui::AXNode* column1 = table->ChildAtIndex(1);
 289   EXPECT_EQ(ui::AX_ROLE_COLUMN, column1->data().role);
 290   EXPECT_EQ(0, column1->child_count());
 291   EXPECT_EQ(1U, column1->data().intlist_attributes.size());
 292   EXPECT_EQ(ui::AX_ATTR_INDIRECT_CHILD_IDS,
 293             column1->data().intlist_attributes[0].first);
 294   const std::vector<int32> column1_indirect_child_ids =
 295       column1->data().intlist_attributes[0].second;
 296   EXPECT_EQ(1U, column1_indirect_child_ids.size());
 297   EXPECT_EQ(cell1->id(), column1_indirect_child_ids[0]);
 298   const ui::AXNode* column2 = table->ChildAtIndex(2);
 299   EXPECT_EQ(ui::AX_ROLE_COLUMN, column2->data().role);
 300   EXPECT_EQ(0, column2->child_count());
 301   EXPECT_EQ(ui::AX_ATTR_INDIRECT_CHILD_IDS,
 302             column2->data().intlist_attributes[0].first);
 303   const std::vector<int32> column2_indirect_child_ids =
 304       column2->data().intlist_attributes[0].second;
 305   EXPECT_EQ(1U, column2_indirect_child_ids.size());
 306   EXPECT_EQ(cell2->id(), column2_indirect_child_ids[0]);
 307 }
 308
 309 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 310                        MultipleInheritanceAccessibility2) {
 311   // Here's another html snippet where WebKit puts the same node as a child
 312   // of two different parents. Instead of checking the exact output, just
 313   // make sure that no id is reused in the resulting tree.
 314   const char url_str[] =
 315       "data:text/html,"
 316       "<!doctype html>"
 317       "<script>\n"
 318       "  document.writeln('<q><section></section></q><q><li>');\n"
 319       "  setTimeout(function() {\n"
 320       "    document.close();\n"
 321       "  }, 1);\n"
 322       "</script>";
 323   GURL url(url_str);
 324   NavigateToURL(shell(), url);
 325
 326   const ui::AXTree& tree = GetAXTree();
 327   const ui::AXNode* root = tree.root();
 328   base::hash_set<int> ids;
 329   RecursiveAssertUniqueIds(root, &ids);
 330 }
 331
 332 // TODO(dmazzoni): Needs to be rebaselined. http://crbug.com/347464
 333 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 334                        DISABLED_IframeAccessibility) {
 335   // Create a data url and load it.
 336   const char url_str[] =
 337       "data:text/html,"
 338       "<!doctype html><html><body>"
 339       "<button>Button 1</button>"
 340       "<iframe src='data:text/html,"
 341       "<!doctype html><html><body><button>Button 2</button></body></html>"
 342       "'></iframe>"
 343       "<button>Button 3</button>"
 344       "</body></html>";
 345   GURL url(url_str);
 346   NavigateToURL(shell(), url);
 347
 348   const ui::AXTree& tree = GetAXTree();
 349   const ui::AXNode* root = tree.root();
 350   ASSERT_EQ(1, root->child_count());
 351   const ui::AXNode* body = root->ChildAtIndex(0);
 352   ASSERT_EQ(3, body->child_count());
 353
 354   const ui::AXNode* button1 = body->ChildAtIndex(0);
 355   EXPECT_EQ(ui::AX_ROLE_BUTTON, button1->data().role);
 356   EXPECT_STREQ(
 357       "Button 1",
 358       GetAttr(button1, ui::AX_ATTR_NAME).c_str());
 359
 360   const ui::AXNode* iframe = body->ChildAtIndex(1);
 361   EXPECT_STREQ("iframe",
 362                GetAttr(iframe, ui::AX_ATTR_HTML_TAG).c_str());
 363   ASSERT_EQ(1, iframe->child_count());
 364
 365   const ui::AXNode* scroll_area = iframe->ChildAtIndex(0);
 366   EXPECT_EQ(ui::AX_ROLE_SCROLL_AREA, scroll_area->data().role);
 367   ASSERT_EQ(1, scroll_area->child_count());
 368
 369   const ui::AXNode* sub_document = scroll_area->ChildAtIndex(0);
 370   EXPECT_EQ(ui::AX_ROLE_WEB_AREA, sub_document->data().role);
 371   ASSERT_EQ(1, sub_document->child_count());
 372
 373   const ui::AXNode* sub_body = sub_document->ChildAtIndex(0);
 374   ASSERT_EQ(1, sub_body->child_count());
 375
 376   const ui::AXNode* button2 = sub_body->ChildAtIndex(0);
 377   EXPECT_EQ(ui::AX_ROLE_BUTTON, button2->data().role);
 378   EXPECT_STREQ("Button 2",
 379                GetAttr(button2, ui::AX_ATTR_NAME).c_str());
 380
 381   const ui::AXNode* button3 = body->ChildAtIndex(2);
 382   EXPECT_EQ(ui::AX_ROLE_BUTTON, button3->data().role);
 383   EXPECT_STREQ("Button 3",
 384                GetAttr(button3, ui::AX_ATTR_NAME).c_str());
 385 }
 386
 387 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 388                        DuplicateChildrenAccessibility) {
 389   // Here's another html snippet where WebKit has a parent node containing
 390   // two duplicate child nodes. Instead of checking the exact output, just
 391   // make sure that no id is reused in the resulting tree.
 392   const char url_str[] =
 393       "data:text/html,"
 394       "<!doctype html>"
 395       "<em><code ><h4 ></em>";
 396   GURL url(url_str);
 397   NavigateToURL(shell(), url);
 398
 399   const ui::AXTree& tree = GetAXTree();
 400   const ui::AXNode* root = tree.root();
 401   base::hash_set<int> ids;
 402   RecursiveAssertUniqueIds(root, &ids);
 403 }
 404
 405 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 406                        MAYBE_TableSpan) {
 407   // +---+---+---+
 408   // |   1   | 2 |
 409   // +---+---+---+
 410   // | 3 |   4   |
 411   // +---+---+---+
 412
 413   const char url_str[] =
 414       "data:text/html,"
 415       "<!doctype html>"
 416       "<table border=1>"
 417       " <tr>"
 418       "  <td colspan=2>1</td><td>2</td>"
 419       " </tr>"
 420       " <tr>"
 421       "  <td>3</td><td colspan=2>4</td>"
 422       " </tr>"
 423       "</table>";
 424   GURL url(url_str);
 425   NavigateToURL(shell(), url);
 426
 427   const ui::AXTree& tree = GetAXTree();
 428   const ui::AXNode* root = tree.root();
 429   const ui::AXNode* table = root->ChildAtIndex(0);
 430   EXPECT_EQ(ui::AX_ROLE_TABLE, table->data().role);
 431   ASSERT_GE(table->child_count(), 5);
 432   EXPECT_EQ(ui::AX_ROLE_ROW, table->ChildAtIndex(0)->data().role);
 433   EXPECT_EQ(ui::AX_ROLE_ROW, table->ChildAtIndex(1)->data().role);
 434   EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(2)->data().role);
 435   EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(3)->data().role);
 436   EXPECT_EQ(ui::AX_ROLE_COLUMN, table->ChildAtIndex(4)->data().role);
 437   EXPECT_EQ(3,
 438             GetIntAttr(table, ui::AX_ATTR_TABLE_COLUMN_COUNT));
 439   EXPECT_EQ(2, GetIntAttr(table, ui::AX_ATTR_TABLE_ROW_COUNT));
 440
 441   const ui::AXNode* cell1 = table->ChildAtIndex(0)->ChildAtIndex(0);
 442   const ui::AXNode* cell2 = table->ChildAtIndex(0)->ChildAtIndex(1);
 443   const ui::AXNode* cell3 = table->ChildAtIndex(1)->ChildAtIndex(0);
 444   const ui::AXNode* cell4 = table->ChildAtIndex(1)->ChildAtIndex(1);
 445
 446   ASSERT_EQ(ui::AX_ATTR_CELL_IDS,
 447             table->data().intlist_attributes[0].first);
 448   const std::vector<int32>& table_cell_ids =
 449       table->data().intlist_attributes[0].second;
 450   ASSERT_EQ(6U, table_cell_ids.size());
 451   EXPECT_EQ(cell1->id(), table_cell_ids[0]);
 452   EXPECT_EQ(cell1->id(), table_cell_ids[1]);
 453   EXPECT_EQ(cell2->id(), table_cell_ids[2]);
 454   EXPECT_EQ(cell3->id(), table_cell_ids[3]);
 455   EXPECT_EQ(cell4->id(), table_cell_ids[4]);
 456   EXPECT_EQ(cell4->id(), table_cell_ids[5]);
 457
 458   EXPECT_EQ(0, GetIntAttr(cell1,
 459                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
 460   EXPECT_EQ(0, GetIntAttr(cell1,
 461                           ui::AX_ATTR_TABLE_CELL_ROW_INDEX));
 462   EXPECT_EQ(2, GetIntAttr(cell1,
 463                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
 464   EXPECT_EQ(1, GetIntAttr(cell1,
 465                           ui::AX_ATTR_TABLE_CELL_ROW_SPAN));
 466   EXPECT_EQ(2, GetIntAttr(cell2,
 467                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
 468   EXPECT_EQ(1, GetIntAttr(cell2,
 469                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
 470   EXPECT_EQ(0, GetIntAttr(cell3,
 471                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
 472   EXPECT_EQ(1, GetIntAttr(cell3,
 473                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
 474   EXPECT_EQ(1, GetIntAttr(cell4,
 475                           ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX));
 476   EXPECT_EQ(2, GetIntAttr(cell4,
 477                           ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN));
 478 }
 479
 480 IN_PROC_BROWSER_TEST_F(CrossPlatformAccessibilityBrowserTest,
 481                        WritableElement) {
 482   const char url_str[] =
 483       "data:text/html,"
 484       "<!doctype html>"
 485       "<div role='textbox' tabindex=0>"
 486       " Some text"
 487       "</div>";
 488   GURL url(url_str);
 489   NavigateToURL(shell(), url);
 490   const ui::AXTree& tree = GetAXTree();
 491   const ui::AXNode* root = tree.root();
 492   ASSERT_EQ(1, root->child_count());
 493   const ui::AXNode* textbox = root->ChildAtIndex(0);
 494   EXPECT_EQ(true, GetBoolAttr(textbox, ui::AX_ATTR_CAN_SET_VALUE));
 495 }
 496
 497 }  // namespace content