Maximum length option for input field

Could this please be considered for addition in a future release.
I couldn’t get maxlength to work – I’m not even sure what object type the fontsampler text box is!
$('.fontsampler-id-1 > div:nth-child(1) > div:nth-child(1)').attr('maxlength','6');

so tried this code which works but it isn’t very elegant:

jQuery(document).ready(function( $ ){
      $("body").on("input", ".current-font", function (textevent) {
    if($(textevent.target).text().length >6) $(textevent.target).text($(textevent.target).text().substr(0,6));
  });
});

Many thanks