diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
index 9d2df8d09dc4..b89938f3c560 100644
--- a/LayoutTests/ChangeLog
+++ b/LayoutTests/ChangeLog
@@ -1,3 +1,13 @@
+2017-09-27  Joanmarie Diggs  <jdiggs@igalia.com>
+
+        [ATK] atk_table_cell_get_position() should return values of aria-rowindex and aria-colindex, if present
+        https://bugs.webkit.org/show_bug.cgi?id=171176
+
+        Reviewed by Chris Fleizach.
+
+        * accessibility/aria-table-attributes.html: Updated to reflect new behavior.
+        * platform/gtk/accessibility/aria-table-attributes-expected.txt: Updated to reflect new behavior.
+
 2017-09-26  Joanmarie Diggs  <jdiggs@igalia.com>
 
         AX: Several ARIA roles with presentational children are exposing children
diff --git a/LayoutTests/accessibility/aria-table-attributes.html b/LayoutTests/accessibility/aria-table-attributes.html
index ae56983f0299..95f07cf1009d 100644
--- a/LayoutTests/accessibility/aria-table-attributes.html
+++ b/LayoutTests/accessibility/aria-table-attributes.html
@@ -97,11 +97,17 @@
           // aria-colindex from parent row
           shouldBe("cell4.numberAttributeValue('AXARIAColumnIndex')", "3");
           
-          // aria-colspan and aria-rowspan
-          shouldBe("cell2.rowIndexRange()", "'{1, 2}'");
-          shouldBe("cell5.columnIndexRange()", "'{2, 3}'");
-          // aria-rowspan="0"
-          shouldBe("cell3.rowIndexRange()", "'{1, 2}'");
+          // aria-colspan and aria-rowspan, including aria-rowspan="0"
+          if (accessibilityController.platformName == "atk") {
+              // 0-based because these methods use the AtkTableCell interface
+              shouldBe("cell2.rowIndexRange()", "'{7, 2}'");
+              shouldBe("cell5.columnIndexRange()", "'{3, 3}'");
+              shouldBe("cell3.rowIndexRange()", "'{7, 2}'");
+          } else {
+              shouldBe("cell2.rowIndexRange()", "'{1, 2}'");
+              shouldBe("cell5.columnIndexRange()", "'{2, 3}'");
+              shouldBe("cell3.rowIndexRange()", "'{1, 2}'");
+          }
           shouldBe("cell6.rowIndexRange()", "'{0, 2}'");
           // use rowspan for native table
           shouldBe("cell7.rowIndexRange()", "'{0, 2}'");
diff --git a/LayoutTests/platform/gtk/accessibility/aria-table-attributes-expected.txt b/LayoutTests/platform/gtk/accessibility/aria-table-attributes-expected.txt
index 95d49a169d3d..2cebb504be82 100644
--- a/LayoutTests/platform/gtk/accessibility/aria-table-attributes-expected.txt
+++ b/LayoutTests/platform/gtk/accessibility/aria-table-attributes-expected.txt
@@ -12,9 +12,9 @@ PASS cell1.numberAttributeValue('AXARIARowIndex') is 7
 PASS cell2.numberAttributeValue('AXARIAColumnIndex') is 4
 PASS cell2.numberAttributeValue('AXARIARowIndex') is 8
 PASS cell4.numberAttributeValue('AXARIAColumnIndex') is 3
-PASS cell2.rowIndexRange() is '{1, 2}'
-PASS cell5.columnIndexRange() is '{2, 3}'
-PASS cell3.rowIndexRange() is '{1, 2}'
+PASS cell2.rowIndexRange() is '{7, 2}'
+PASS cell5.columnIndexRange() is '{3, 3}'
+PASS cell3.rowIndexRange() is '{7, 2}'
 PASS cell6.rowIndexRange() is '{0, 2}'
 PASS cell7.rowIndexRange() is '{0, 2}'
 PASS successfullyParsed is true
diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index 1a1c2a34d50c..d9ba6ead2c96 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,19 @@
+2017-09-27  Joanmarie Diggs  <jdiggs@igalia.com>
+
+        [ATK] atk_table_cell_get_position() should return values of aria-rowindex and aria-colindex, if present
+        https://bugs.webkit.org/show_bug.cgi?id=171176
+
+        Reviewed by Chris Fleizach.
+
+        Modify webKitAccessibleTableCellGetPosition() to prefer the ARIA value
+        over the DOM-based value.
+
+        No new tests needed: We have coverage through aria-table-attributes.html.
+        Platform expectations for this test were updated.
+
+        * accessibility/atk/WebKitAccessibleInterfaceTableCell.cpp:
+        (webkitAccessibleTableCellGetPosition):
+
 2017-09-26  Joanmarie Diggs  <jdiggs@igalia.com>
 
         AX: Several ARIA roles with presentational children are exposing children
diff --git a/Source/WebCore/accessibility/atk/WebKitAccessibleInterfaceTableCell.cpp b/Source/WebCore/accessibility/atk/WebKitAccessibleInterfaceTableCell.cpp
index 3d1e96211e94..1f096d1ddcb6 100644
--- a/Source/WebCore/accessibility/atk/WebKitAccessibleInterfaceTableCell.cpp
+++ b/Source/WebCore/accessibility/atk/WebKitAccessibleInterfaceTableCell.cpp
@@ -119,12 +119,22 @@ gboolean webkitAccessibleTableCellGetPosition(AtkTableCell* cell, gint* row, gin
 
     std::pair<unsigned, unsigned> columnRowRange;
     if (row) {
-        downcast<AccessibilityTableCell>(*axObject).rowIndexRange(columnRowRange);
-        *row = columnRowRange.first;
+        // aria-rowindex is 1-based.
+        int rowIndex = downcast<AccessibilityTableCell>(*axObject).ariaRowIndex() - 1;
+        if (rowIndex <= -1) {
+            downcast<AccessibilityTableCell>(*axObject).rowIndexRange(columnRowRange);
+            rowIndex = columnRowRange.first;
+        }
+        *row = rowIndex;
     }
     if (column) {
-        downcast<AccessibilityTableCell>(*axObject).columnIndexRange(columnRowRange);
-        *column = columnRowRange.first;
+        // aria-colindex is 1-based.
+        int columnIndex = downcast<AccessibilityTableCell>(*axObject).ariaColumnIndex() - 1;
+        if (columnIndex <= -1) {
+            downcast<AccessibilityTableCell>(*axObject).columnIndexRange(columnRowRange);
+            columnIndex = columnRowRange.first;
+        }
+        *column = columnIndex;
     }
 
     return true;