Bug 1792964: Add hittesting test for tables, table rows, table cells r=eeejay

Differential Revision: https://phabricator.services.mozilla.com/D159524

accessible/tests/browser/hittest/browser_test_general.js

@@ -78,6 +78,13 @@ async function runTests(browser, accDoc) {
     container2Input,
     container2Input
   );
+
+  info("hittesting table, row, cells -- rows are not in the layout tree");
+  const table = findAccessibleChildByID(accDoc, "table");
+  const row = findAccessibleChildByID(accDoc, "row");
+  const cell1 = findAccessibleChildByID(accDoc, "cell1");
+
+  await hitTest(browser, table, row, cell1);
 }
 
 addAccessibleTask(
@@ -106,6 +113,13 @@ addAccessibleTask(
   <div id="container2" style="width: 0px">
     <input id="container2_input">
   </div>
+
+  <table id="table" border>
+    <tr id="row">
+      <td id="cell1">hello</td>
+      <td id="cell2">world</td>
+    </tr>
+  </table>
   `,
   runTests,
   {