I need to copy html div to clipboard，I am following the tutorial to copy.

    function copyElement(html){            
        var input = document.createElement('textarea');
        input.innerHTML = html;
        document.body.appendChild(input);
        input.select();
        var result = document.execCommand('copy');
        document.body.removeChild(input);
        return result;            
    }

it works but it only copy the html element instead of html string, how would I get the html ?