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diff --git a/editor/libeditor/tests/test_password_per_word_operation.html b/editor/libeditor/tests/test_password_per_word_operation.html
new file mode 100644
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+++ b/editor/libeditor/tests/test_password_per_word_operation.html
@@ -0,0 +1,148 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for operations in a password field</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<input type="password" value="abcdef ghijk" size="50">
+<script>
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(async () => {
+  await SpecialPowers.pushPrefEnv({
+    set: [["layout.word_select.eat_space_to_next_word", false]],
+  });
+  // Double click on the anonymous text node
+  let input = document.getElementsByTagName("input")[0];
+  let editor = SpecialPowers.wrap(input).editor;
+  let anonymousDiv = editor.rootElement;
+  input.select();
+  const kTextNodeRectInAnonymousDiv = {
+     left: editor.selection.getRangeAt(0).getBoundingClientRect().left - anonymousDiv.getBoundingClientRect().left,
+     top: editor.selection.getRangeAt(0).getBoundingClientRect().top - anonymousDiv.getBoundingClientRect().top,
+     width: editor.selection.getRangeAt(0).getBoundingClientRect().width,
+     height: editor.selection.getRangeAt(0).getBoundingClientRect().height,
+  };
+  kTextNodeRectInAnonymousDiv.right = kTextNodeRectInAnonymousDiv.left + kTextNodeRectInAnonymousDiv.width;
+  kTextNodeRectInAnonymousDiv.bottom = kTextNodeRectInAnonymousDiv.top + kTextNodeRectInAnonymousDiv.height;
+  input.setSelectionRange(0, 0);
+  const kHalfHeightOfAnonymousDiv = anonymousDiv.getBoundingClientRect().height / 2;
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.left + 5, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 1});
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.left + 5, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 2});
+  is(input.selectionStart, 0,
+     "Double clicking on the anonymous text node in a password field should select all");
+  is(input.selectionEnd, input.value.length,
+     "Double clicking on the anonymous text node in a password field should select all");
+
+  // Double click on the anonymous div element
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.right + 3, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 1});
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.right + 3, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 2});
+  is(input.selectionStart, 0,
+     "Double clicking on the anonymous div element in a password field should select all");
+  is(input.selectionEnd, input.value.length,
+     "Double clicking on the anonymous div element in a password field should select all");
+
+  // Move caret per word
+  let selectionController = editor.selectionController;
+  input.focus();
+  input.setSelectionRange(12, 12);
+  selectionController.wordMove(false, false);
+  is(input.selectionStart, 0,
+     "Moving caret one word from the end should move caret to the start");
+  input.setSelectionRange(0, 0);
+  selectionController.wordMove(true, false);
+  is(input.selectionStart, 12,
+     "Moving caret one word from the start should move caret to the end");
+
+  // Expand selection per word
+  input.setSelectionRange(12, 12);
+  selectionController.wordMove(false, true);
+  is(input.selectionStart, 0,
+     "Selecting one word from the end should move selection start to the start");
+  input.setSelectionRange(0, 0);
+  selectionController.wordMove(true, true);
+  is(input.selectionEnd, 12,
+     "Selecting one word from the start should move selection end to the end");
+
+  // Delete one word
+  input.setSelectionRange(12, 12);
+  editor.deleteSelection(editor.ePreviousWord, editor.eStrip);
+  is(input.value, "",
+     "Deleting one word from the end should delete all characters");
+  input.value = "abcdef ghijk";
+  document.documentElement.scrollTop;  // Flush frames for setting the value.
+  input.setSelectionRange(0, 0);
+  editor.deleteSelection(editor.eNextWord, editor.eStrip);
+  is(input.value, "",
+     "Deleting one word from the start should delete all characters");
+  input.value = "abcdef ghijk";
+  document.documentElement.scrollTop;  // Flush frames for setting the value.
+
+  // Test same things when the space is unmasked.
+
+  // Double click on the anonymous text node
+  editor.unmask(6, 7);
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.left + 3, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 1});
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.left + 3, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 2});
+  is(input.selectionStart, 0,
+     "Double clicking on the first word should select it");
+  is(input.selectionEnd, 6,
+     "Double clicking on the first word should select it");
+
+  // Double click on the anonymous div element
+  editor.unmask(6, 7);
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.right + 3, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 1});
+  synthesizeMouse(anonymousDiv, kTextNodeRectInAnonymousDiv.right + 3, kHalfHeightOfAnonymousDiv, {button: 0, clickCount: 2});
+  is(input.selectionStart, 7,
+     "Double clicking on the anonymous div element in a password field should select the last word");
+  is(input.selectionEnd, input.value.length,
+     "Double clicking on the anonymous div element in a password field should select the last word");
+
+  // Move caret per word
+  input.focus();
+  input.setSelectionRange(12, 12);
+  editor.unmask(6, 7);
+  selectionController.wordMove(false, false);
+  is(input.selectionStart, 6,
+     "Moving caret one word from the end should move caret to end of the first word");
+  input.setSelectionRange(0, 0);
+  editor.unmask(6, 7);
+  selectionController.wordMove(true, false);
+  is(input.selectionStart, 7,
+     "Moving caret one word from the start should move caret to start of the last word");
+
+  // Expand selection per word
+  input.setSelectionRange(12, 12);
+  editor.unmask(6, 7);
+  selectionController.wordMove(false, true);
+  is(input.selectionStart, 6,
+     "Selecting one word from the end should move selection start to end of the first word");
+  input.setSelectionRange(0, 0);
+  editor.unmask(6, 7);
+  selectionController.wordMove(true, true);
+  is(input.selectionEnd, 7,
+     "Selecting one word from the start should move selection end to start of the last word");
+
+  // Delete one word
+  input.setSelectionRange(12, 12);
+  editor.unmask(6, 7);
+  editor.deleteSelection(editor.ePreviousWord, editor.eStrip);
+  is(input.value, "abcdef",
+     "Deleting one word from the end should delete the last word");
+  input.value = "abcdef ghijk";
+  document.documentElement.scrollTop;  // Flush frames for setting the value.
+  input.setSelectionRange(0, 0);
+  editor.unmask(6, 7);
+  editor.deleteSelection(editor.eNextWord, editor.eStrip);
+  is(input.value, "ghijk",
+     "Deleting one word from the start should delete the first word");
+  input.value = "abcdef ghijk";
+  document.documentElement.scrollTop;  // Flush frames for setting the value.
+
+  SimpleTest.finish();
+});
+</script>
+</body>
+</html>