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chromium/third_party/blink/web_tests/editing/inserting/paragraph_separator_in_table.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// This tests InsertParagraphSeparator inside table cells.
selection_test(
    [
        '<div contenteditable><table><tbody><tr>',
            '<td>Cell One</td><td>Cell |Two</td>',
        '</tr></tbody></table></div>',
    ],
    'InsertParagraph',
    [
        '<div contenteditable><table><tbody><tr>',
            '<td>Cell One</td><td>Cell <br>|Two</td>',
        '</tr></tbody></table></div>',
    ],
    'Insert newline in the cell');

selection_test(
    [
        '<div contenteditable><table><tbody><tr>',
            '<td>Cell ^One</td><td>Cell| Two</td>',
        '</tr></tbody></table></div>',
    ],
    'InsertParagraph',
    [
        '<div contenteditable><table><tbody><tr>',
            '<td>Cell\u00A0<br>|<br></td><td>\u00A0Two</td>',
        '</tr></tbody></table></div>',
    ],
    'Replace range in cells with newline');
</script>