code: function drawLinearValueBox(context, options, value, x, y, w, h) {
      // currently value box is available only for vertical linear gauge,
      // as far as by design it is hard to find a proper place for
      // horizontal ones
      let boxWidth = (parseFloat(options.fontValueSize) || 0) * w / 200;
      let dy = (0.11 * h - boxWidth) / 2;
  
      context.barDimensions.isVertical &&
      drawings.drawValueBox(context, options, value, x + w / 2,
          y + h - boxWidth - dy, w);
  }
docs: /* istanbul ignore next: private, not testable 
  Draws value box for linear gauge
  
  @access private
  @param {Canvas2DContext} context
  @param {LinearGaugeOptions} options
  @param {number} value
  @param {number} x
  @param {number} y
  @param {number} w
  @param {number} h