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diff --git a/editor/libeditor/tests/test_nsITableEditor_getCellIndexes.html b/editor/libeditor/tests/test_nsITableEditor_getCellIndexes.html
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+++ b/editor/libeditor/tests/test_nsITableEditor_getCellIndexes.html
@@ -0,0 +1,91 @@
+<!DOCTYPE>
+<html>
+<head>
+  <title>Test for nsITableEditor.getCellIndexes()</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<div id="display">
+</div>
+<div id="content" contenteditable></div>
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  let editor = document.getElementById("content");
+  let selection = document.getSelection();
+  let rowIndex = {}, columnIndex = {};
+
+  try {
+    getTableEditor().getCellIndexes(undefined, rowIndex, columnIndex);
+    ok(false, "nsITableEditor.getCellIndexes(undefined) should cause throwing an exception");
+  } catch (e) {
+    ok(true, "nsITableEditor.getCellIndexes(undefined) should cause throwing an exception");
+  }
+
+  try {
+    getTableEditor().getCellIndexes(null, rowIndex, columnIndex);
+    ok(false, "nsITableEditor.getCellIndexes(null) should cause throwing an exception");
+  } catch (e) {
+    ok(true, "nsITableEditor.getCellIndexes(null) should cause throwing an exception");
+  }
+
+  try {
+    getTableEditor().getCellIndexes(editor, rowIndex, columnIndex);
+    ok(false, "nsITableEditor.getCellIndexes() should cause throwing an exception if given node is not a <td> nor a <th>");
+  } catch (e) {
+    ok(true, "nsITableEditor.getCellIndexes() should cause throwing an exception if given node is not a <td> nor a <th>");
+  }
+
+  // Set id to "test" for the argument for getCellIndexes().
+  // Set data-row and data-col to expected indexes.
+  const kTests = [
+    '<table><tr><td id="test" data-row="0" data-col="0">cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td id="test" data-row="0" data-col="1">cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td id="test" data-row="0" data-col="2">cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td id="test" data-row="1" data-col="0">cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td id="test" data-row="1" data-col="1">cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td id="test" data-row="1" data-col="2">cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td id="test" data-row="2" data-col="0">cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td id="test" data-row="2" data-col="1">cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td id="test" data-row="2" data-col="2">cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td id="test" data-row="0" data-col="1" rowspan="2">cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td rowspan="2">cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td id="test" data-row="2" data-col="1">cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td id="test" data-row="0" data-col="1">cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td rowspan="2">cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td id="test" data-row="1" data-col="1" rowspan="2">cell2-2</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td id="test" data-row="1" data-col="0" colspan="2">cell2-1</td><td>cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td colspan="2">cell2-1</td><td id="test" data-row="1" data-col="2">cell2-3</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td id="test" data-row="1" data-col="0">cell2-1</td><td colspan="2">cell2-2</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><td>cell1-1</td><td>cell1-2</td><td>cell1-3</tr><tr><td>cell2-1</td><td id="test" data-row="1" data-col="1" colspan="2">cell2-2</td></tr><tr><td>cell3-1</td><td>cell3-2</td><td>cell3-3</td></tr></table>',
+    '<table><tr><th id="test" data-row="0" data-col="0">cell1-1</th><th>cell1-2</th><th>cell1-3</tr><tr><th>cell2-1</th><th>cell2-2</th><th>cell2-3</th></tr><tr><th>cell3-1</th><th>cell3-2</th><th>cell3-3</th></tr></table>',
+  ];
+
+  for (const kTest of kTests) {
+    editor.innerHTML = kTest;
+    let cell = document.getElementById("test");
+    getTableEditor().getCellIndexes(cell, rowIndex, columnIndex);
+    is(rowIndex.value.toString(10), cell.getAttribute("data-row"), `Specified cell element directly, row Index value of ${kTest}`);
+    is(columnIndex.value.toString(10), cell.getAttribute("data-col"), `Specified cell element directly, column Index value of ${kTest}`);
+    selection.collapse(cell.firstChild, 0);
+    getTableEditor().getCellIndexes(null, rowIndex, columnIndex);
+    is(rowIndex.value.toString(10), cell.getAttribute("data-row"), `Selection is collapsed in the cell element, row Index value of ${kTest}`);
+    is(columnIndex.value.toString(10), cell.getAttribute("data-col"), `Selection is collapsed in the cell element, column Index value of ${kTest}`);
+  }
+
+  SimpleTest.finish();
+});
+
+function getTableEditor() {
+  var Ci = SpecialPowers.Ci;
+  var editingSession = SpecialPowers.wrap(window).docShell.editingSession;
+  return editingSession.getEditorForWindow(window).QueryInterface(Ci.nsITableEditor);
+}
+
+</script>
+</body>
+
+</html>