chromium/third_party/blink/web_tests/external/wpt/editing/manual/textarea-insertfromdrop-type-inputevent-data-withnewline-manual.html

<!doctype html>
<html>
<meta charset=utf-8>
<title>Manual drag and drop text</title>

<textarea id="text" rows="16" cols="60">Please select a paragraph of the text in this textarea,
    so the selected text has a newline either at the start or end or both the places and then
    drag-and-drop the selected text to a different section of the textarea.

    It is expected that "deleteByDrag" events will have no data (data == null), but it is
    expected that "insertFromDrop" events populate the data attribute with the text that was
    dropped / inserted.

    If you see "insertFromDrop" events having the data that was dragged and dropped, then the
    test passes.

    See https://www.w3.org/TR/input-events-1/#overview
</textarea>
<div id="out"></div>
<script>
    function getInputEventData(event) {
        const out = document.getElementById('out');
        const line = document.createElement('div');
        line.textContent = 'inputType: ' + event.inputType + ' eventData: ' + event.data;
        out.appendChild(line);
    }
    const text = document.getElementById('text');
    text.addEventListener('input', getInputEventData);
</script>
</html>