HTML5 output tag http://www.sansys.net/2014/07/html5-output-

(function(){
    var x = document.getElementById('x');

    if (!x.hasOwnProperty('value')){
        console.log('Возможно IE');
        var a = document.getElementById('a');
        a.onchange = function(){document.forms[0].oninput();}
    }
})();