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diff --git a/editor/libeditor/tests/test_nsITableEditor_deleteTableCellContents.html b/editor/libeditor/tests/test_nsITableEditor_deleteTableCellContents.html
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+++ b/editor/libeditor/tests/test_nsITableEditor_deleteTableCellContents.html
@@ -0,0 +1,296 @@
+<!DOCTYPE>
+<html>
+<head>
+  <title>Test for nsITableEditor.deleteTableCellContents()</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>out of table<table><tr><td>default content</td></tr></table></div>
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(() => {
+  let editor = document.getElementById("content");
+  let selection = document.getSelection();
+  let selectionRanges = [];
+
+  function checkInputEvent(aEvent, aDescription) {
+    ok(aEvent instanceof InputEvent,
+       `"${aEvent.type}" event should be dispatched with InputEvent interface ${aDescription}`);
+    is(aEvent.cancelable, aEvent.type === "beforeinput",
+       `"${aEvent.type}" event should ${aEvent.type === "beforeinput" ? "be" : "be never"} cancelable ${aDescription}`);
+    is(aEvent.bubbles, true,
+       `"${aEvent.type}" event should always bubble ${aDescription}`);
+    is(aEvent.inputType, "deleteContent",
+       `inputType of "${aEvent.type}" event should be "deleteContent" ${aDescription}`);
+    is(aEvent.data, null,
+       `data of "${aEvent.type}" event should be null ${aDescription}`);
+    is(aEvent.dataTransfer, null,
+       `dataTransfer of "${aEvent.type}" event should be null ${aDescription}`);
+    let targetRanges = aEvent.getTargetRanges();
+    if (aEvent.type === "beforeinput") {
+      is(targetRanges.length, selectionRanges.length,
+         `getTargetRanges() of "beforeinput" event should return selection ranges ${aDescription}`);
+      if (targetRanges.length === selectionRanges.length) {
+        for (let i = 0; i < selectionRanges.length; i++) {
+          is(targetRanges[i].startContainer, selectionRanges[i].startContainer,
+             `startContainer of getTargetRanges()[${i}] of "beforeinput" event does not match ${aDescription}`);
+          is(targetRanges[i].startOffset, selectionRanges[i].startOffset,
+             `startOffset of getTargetRanges()[${i}] of "beforeinput" event does not match ${aDescription}`);
+          is(targetRanges[i].endContainer, selectionRanges[i].endContainer,
+             `endContainer of getTargetRanges()[${i}] of "beforeinput" event does not match ${aDescription}`);
+          is(targetRanges[i].endOffset, selectionRanges[i].endOffset,
+             `endOffset of getTargetRanges()[${i}] of "beforeinput" event does not match ${aDescription}`);
+        }
+      }
+    } else {
+      is(targetRanges.length, 0,
+         `getTargetRanges() of "${aEvent.type}" event should return empty array ${aDescription}`);
+    }
+  }
+
+  let beforeInputEvents = [];
+  let inputEvents = [];
+  function onBeforeInput(aEvent) {
+    beforeInputEvents.push(aEvent);
+    selectionRanges = [];
+    for (let i = 0; i < selection.rangeCount; i++) {
+      let range = selection.getRangeAt(i);
+      selectionRanges.push({startContainer: range.startContainer, startOffset: range.startOffset,
+                            endContainer: range.endContainer, endOffset: range.endOffset});
+    }
+  }
+  function onInput(aEvent) {
+    inputEvents.push(aEvent);
+  }
+  editor.addEventListener("beforeinput", onBeforeInput);
+  editor.addEventListener("input", onInput);
+
+  selection.collapse(editor.firstChild, 0);
+  beforeInputEvents = [];
+  inputEvents = [];
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "out of table<table><tbody><tr><td>default content</td></tr></tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should do nothing if selection is not in <table>");
+  // If there were specific inputType value for this API, we should dispatch cancelable "beforeinput", though.
+  is(beforeInputEvents.length, 1,
+     '"beforeinput" event should be fired when a call of nsITableEditor.deleteTableCellContents() even though it will do nothing');
+  checkInputEvent(beforeInputEvents[0], "when selection is collapsed outside table element");
+  is(inputEvents.length, 0,
+     'No "input" event should be fired when a call of nsITableEditor.deleteTableCellContents() does nothing');
+
+  selection.removeAllRanges();
+  try {
+    beforeInputEvents = [];
+    inputEvents = [];
+    getTableEditor().deleteTableCellContents();
+    ok(false, "getTableEditor().deleteTableCellContents() without selection ranges should throw exception");
+  } catch (e) {
+    ok(true, "getTableEditor().deleteTableCellContents() without selection ranges should throw exception");
+    is(beforeInputEvents.length, 0,
+       'No "beforeinput" event should be fired when nsITableEditor.deleteTableCellContents() causes exception due to no selection range');
+    is(inputEvents.length, 0,
+       'No "input" event should be fired when nsITableEditor.deleteTableCellContents() causes exception due to no selection range');
+  }
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select">cell1-1</td><td>cell1-2</td></tr>' +
+                       "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  let range = document.createRange();
+  range.selectNode(document.getElementById("select"));
+  selection.addRange(range);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                         '<tr><td id="select"><br></td><td>cell1-2</td></tr>' +
+                         "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                       "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace the selected cell's text with <br> element");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when all text in a cell is selected');
+  checkInputEvent(beforeInputEvents[0], "when all text in a cell is selected");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when all text in a cell is selected');
+  checkInputEvent(inputEvents[0], "when all text in a cell is selected");
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select"><ul><li>list1</li></ul></td><td>cell1-2</td></tr>' +
+                       "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  range = document.createRange();
+  range.selectNode(document.getElementById("select"));
+  selection.addRange(range);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                         '<tr><td id="select"><br></td><td>cell1-2</td></tr>' +
+                         "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                       "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace the selected cell's <ul> element with <br> element");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when <ul> element in a cell is selected');
+  checkInputEvent(beforeInputEvents[0], "when <ul> element in a cell is selected");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when <ul> element in a cell is selected');
+  checkInputEvent(inputEvents[0], "when <ul> element in a cell is selected");
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select1">cell1-1</td><td>cell1-2</td></tr>' +
+                       '<tr><td id="select2">cell2-1</td><td>cell2-2</td></tr>' +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  range = document.createRange();
+  range.selectNode(document.getElementById("select1"));
+  selection.addRange(range);
+  range = document.createRange();
+  range.selectNode(document.getElementById("select2"));
+  selection.addRange(range);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                         '<tr><td id="select1"><br></td><td>cell1-2</td></tr>' +
+                         '<tr><td id="select2"><br></td><td>cell2-2</td></tr>' +
+                       "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace the selected 2 cells' text with <br> element");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when 2 cell elements are selected');
+  checkInputEvent(beforeInputEvents[0], "when 2 cell elements are selected");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when 2 cell elements are selected');
+  checkInputEvent(inputEvents[0], "when 2 cell elements are selected");
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select1">cell1-1</td><td id="select2">cell1-2</td></tr>' +
+                       '<tr><td id="select3">cell2-1</td><td id="select4">cell2-2</td></tr>' +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  range = document.createRange();
+  range.selectNode(document.getElementById("select1"));
+  selection.addRange(range);
+  range = document.createRange();
+  range.selectNode(document.getElementById("select2"));
+  selection.addRange(range);
+  range = document.createRange();
+  range.selectNode(document.getElementById("select3"));
+  selection.addRange(range);
+  range = document.createRange();
+  range.selectNode(document.getElementById("select4"));
+  selection.addRange(range);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                         '<tr><td id="select1"><br></td><td id="select2"><br></td></tr>' +
+                         '<tr><td id="select3"><br></td><td id="select4"><br></td></tr>' +
+                       "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace the selected 4 cells' text with <br> element");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when 4 cell elements are selected');
+  checkInputEvent(beforeInputEvents[0], "when 4 cell elements are selected");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when 4 cell elements are selected');
+  checkInputEvent(inputEvents[0], "when 4 cell elements are selected");
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select" rowspan="2">cell1-1</td><td>cell1-2</td></tr>' +
+                       "<tr><td>cell2-2</td></tr>" +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  range = document.createRange();
+  range.selectNode(document.getElementById("select"));
+  selection.addRange(range);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                         '<tr><td id="select" rowspan="2"><br></td><td>cell1-2</td></tr>' +
+                         "<tr><td>cell2-2</td></tr>" +
+                       "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace the selected cell's text with <br> element (even if the cell is row-spanning)");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when a cell element are selected (even if the cell is row-spanning)');
+  checkInputEvent(beforeInputEvents[0], "when a cell element are selected (even if the cell is row-spanning)");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when a cell element are selected (even if the cell is row-spanning)');
+  checkInputEvent(inputEvents[0], "when a cell element are selected (even if the cell is row-spanning)");
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select" colspan="2">cell1-1</td></tr>' +
+                       "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  range = document.createRange();
+  range.selectNode(document.getElementById("select"));
+  selection.addRange(range);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                          '<tr><td id="select" colspan="2"><br></td></tr>' +
+                          "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                        "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace the selected cell's text with <br> element (even if the cell is column-spanning)");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when a cell element are selected (even if the cell is column-spanning)');
+  checkInputEvent(beforeInputEvents[0], "when a cell element are selected (even if the cell is column-spanning)");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when a cell element are selected (even if the cell is column-spanning)');
+  checkInputEvent(inputEvents[0], "when a cell element are selected (even if the cell is column-spanning)");
+
+  selection.removeAllRanges();
+  editor.innerHTML = "<table>" +
+                       '<tr><td id="select">cell1-1</td><td>cell1-2</td></tr>' +
+                       "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                     "</table>";
+  editor.focus();
+  beforeInputEvents = [];
+  inputEvents = [];
+  selection.setBaseAndExtent(document.getElementById("select").firstChild, 0,
+                             document.getElementById("select").firstChild, 0);
+  getTableEditor().deleteTableCellContents();
+  is(editor.innerHTML, "<table><tbody>" +
+                         '<tr><td id="select"><br></td><td>cell1-2</td></tr>' +
+                         "<tr><td>cell2-1</td><td>cell2-2</td></tr>" +
+                       "</tbody></table>",
+     "nsITableEditor.deleteTableCellContents() should replace a cell's text with <br> element when the cell contains selection range");
+  is(beforeInputEvents.length, 1,
+     'Only one "beforeinput" event should be fired when the cell contains selection range');
+  checkInputEvent(beforeInputEvents[0], "when the cell contains selection range");
+  is(inputEvents.length, 1,
+     'Only one "input" event should be fired when the cell contains selection range');
+  checkInputEvent(inputEvents[0], "when the cell contains selection range");
+
+  editor.removeEventListener("beforeinput", onBeforeInput);
+  editor.removeEventListener("input", onInput);
+
+  SimpleTest.finish();
+});
+
+function getTableEditor() {
+  var editingSession = SpecialPowers.wrap(window).docShell.editingSession;
+  return editingSession.getEditorForWindow(window).QueryInterface(SpecialPowers.Ci.nsITableEditor);
+}
+
+</script>
+</body>
+
+</html>