docs: function updateSizeReading(size,unit,target) {
      var emSize, pxSize;
  
      if(unit==='em') { //If size value is in em units
        emSize = size;
        pxSize = Math.floor(size*$bodySize);
      } else { //If value is px or absent
        pxSize = size;
        emSize = size/$bodySize;
      }
  
      if (target === 'updatePxInput') {
        $sizePx.val(pxSize);
      } else if (target === 'updateEmInput') {
        $sizeEms.val(emSize.toFixed(2));
      } else {
        $sizeEms.val(emSize.toFixed(2));
        $sizePx.val(pxSize);
      }
    }