Javascript detect scrollbar in textarea

by 
function has_scrollbar(elem_id)
{
    const elem = document.getElementById(elem_id);
    if (elem.clientHeight < elem.scrollHeight)
        alert("The element has a vertical scrollbar!");
    else
        alert("The element doesn't have a vertical scrollbar.");
}

See this jsFiddle http://jsfiddle.net/qKNXH/

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