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

<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../assert_selection.js"></script>
<script>
const kStyle = '<style>p { font-family: monospace; padding: 50px; }</style>';

selection_test(
    [
      kStyle,
      '<div contenteditable>',
      '<p>foo b|ar baz</p>',
      '<p>foo bar baz</p>',
      '</div>'
    ],
    selection => selection.modify('move', 'forward', 'line'),
    [
      kStyle,
      '<div contenteditable>',
      '<p>foo bar baz</p>',
      '<p>foo b|ar baz</p>',
      '</div>'
    ],
    'Move forward line across large padding');

selection_test(
    [
      kStyle,
      '<div contenteditable>',
      '<p>foo bar baz</p>',
      '<p>foo b|ar baz</p>',
      '</div>'
    ],
    selection => selection.modify('move', 'backward', 'line'),
    [
      kStyle,
      '<div contenteditable>',
      '<p>foo b|ar baz</p>',
      '<p>foo bar baz</p>',
      '</div>'
    ],
    'Move backward line across large padding');
</script>