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chromium/third_party/blink/web_tests/editing/selection/move-by-line-004.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
//  Test that moving the caret with line granularity within the highest
//  editable root works across non-editable content.

selection_test(
    `
      <div contenteditable style="font-family: monospace">
        <div contenteditable="false">
          <span contenteditable="true">app|le pie</span>
        </div>
        <div contenteditable="false">
          pineapple
        </div>
        <div contenteditable="false">
          <span contenteditable="true">apple juice</span>
        </div>
      </div>
    `,
    selection => selection.modify('move', 'forward', 'line'),
    `
      <div contenteditable style="font-family: monospace">
        <div contenteditable="false">
          <span contenteditable="true">apple pie</span>
        </div>
        <div contenteditable="false">
          pineapple
        </div>
        <div contenteditable="false">
          <span contenteditable="true">app|le juice</span>
        </div>
      </div>
    `,
    'Move down across non-editable div');

selection_test(
    `
      <div contenteditable style="font-family: monospace">
        <div contenteditable="false">
          <span contenteditable="true">apple pie</span>
        </div>
        <div contenteditable="false">
          pineapple
        </div>
        <div contenteditable="false">
          <span contenteditable="true">app|le juice</span>
        </div>
      </div>
    `,
    selection => selection.modify('move', 'backward', 'line'),
    `
      <div contenteditable style="font-family: monospace">
        <div contenteditable="false">
          <span contenteditable="true">app|le pie</span>
        </div>
        <div contenteditable="false">
          pineapple
        </div>
        <div contenteditable="false">
          <span contenteditable="true">apple juice</span>
        </div>
      </div>
    `,
    'Move up across non-editable div');
</script>