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chromium/third_party/blink/web_tests/editing/selection/modify_move/move_left_character_01_ltr.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="ltr">|abc</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="ltr">|abc</div>',
  '1-0 ltr left character');

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

selection_test(
  '<div contenteditable dir="ltr">ab|c</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="ltr">a|bc</div>',
  '1-2 ltr left character');

selection_test(
  '<div contenteditable dir="ltr">abc|</div>',
  selection => selection.modify('move', 'left', 'character'),
  '<div contenteditable dir="ltr">ab|c</div>',
  '1-3 ltr left character');
</script>