<p id="p">Example: <i>italic</i> and <b>bold</b></p>

From <input id="start" type="number" value=1> – To <input id="end" type="number" value=4>
<button id="button">Click to select</button>

let range = new Range();

    range.setStart(p, start.value);
    range.setEnd(p, end.value);

    // применим выделение, объясняется далее
    document.getSelection().removeAllRanges();
    document.getSelection().addRange(range);

$keyboard = [['/help','/add','/list','/mail'], ['/help','/add','/list','/mail']] ;

$keyboard = [[['/help','/add','/list','/mail']['/help','/add','/list','/mail']]];