code: function moveToValue(value) {
      const left = 100 * (value - this.min) / (this.max - this.min);
      Dom.css(this.$elements.button, { left: `${left}%` });
  }
docs: Move button to a position mapping the value.
  
  @this ViewXJS
  @param   {integer} value - Value.
  @returns {undefined}