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chromium/third_party/blink/web_tests/editing/selection/modify_move/move_left_character_03_rtl.html 

<!doctype html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../assert_selection.js"></script>
<script>

selection_test(
  '<div contenteditable dir="rtl">|<br>abc</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="rtl"><br>|abc</div>',
  '3-0 rtl left character');

selection_test(
  '<div contenteditable dir="rtl"><br>|abc</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="rtl"><br>a|bc</div>',
  '3-1 rtl left character');

selection_test(
  '<div contenteditable dir="rtl"><br>a|bc</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="rtl"><br>ab|c</div>',
  '3-2 rtl left character');

selection_test(
  '<div contenteditable dir="rtl"><br>ab|c</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="rtl"><br>abc|</div>',
  '3-3 rtl left character');

selection_test(
  '<div contenteditable dir="rtl"><br>abc|</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="rtl"><br>abc|</div>',
  '3-4 rtl left character');
</script>