chromium/third_party/blink/web_tests/editing/selection/move_between_blocks.html

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
test(() => assert_selection(
    [
        '<div contenteditable id="one">foo|</div>',
        '<div contenteditable id="two">bar</div>',
    ].join(''),
    selection => {
        selection.modify('move', 'forward', 'character');
        selection.document.execCommand('delete');
    },
    [
        '<div contenteditable id="one">fo|</div>',
        '<div contenteditable id="two">bar</div>',
    ].join('')),
    'Two editing hosts; caret can not cross over editing boundary');

test(() => assert_selection(
    [
        '<div contenteditable>',
            '<div contenteditable id="one">foo</div>',
            '<div contenteditable id="two">|bar</div>',
        '</div>',
    ].join(''),
    'delete',
    [
        '<div contenteditable>',
            '<div contenteditable id="one">foo|bar</div>',
        '</div>',
    ].join('')),
    'One editing hosts');
</script>