highhcarts quadrant plotline not visible

by prakhar230792

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>

<div id="container" style="height: 400px"></div>

JavaScript

Highcharts.chart('container', {
  "type": "svg",
  "title": {
    "text": null
  },
  "chart": {
    "type": "scatter",
    "events": {
      load: function() {
        var chart = this,
          xAxis = chart.xAxis[0],
          yAxis = chart.yAxis[0],
          xPlotLine = {
            "width": 1,
            "value": 19,
            "color": "#ccd6eb"
          },
          yPlotLine = {
            "width": 1,
            "value": 600,
            "color": "#ccd6eb"
          };

        

        if (yAxis.min > yPlotLine.value) {
          yAxis.update({
            min: yPlotLine.value - yAxis.tickInterval
          });
        } else if (yAxis.max < yPlotLine.value) {
          yAxis.update({
            max: yPlotLine.value + yAxis.tickInterval
          });
        }

        xAxis.addPlotLine(xPlotLine);
        yAxis.addPlotLine(yPlotLine);
      }
    }
  },
  "plotOptions": {
    "series": {
      "showInLegend": false
    }
  },
  "legend": {
    "enabled": false
  },
  "tooltip": {
    "backgroundColor": "#5F5F5F",
    "borderColor": "#5F5F5F",
    "shadow": false,
    "style": {
      "color": "#FAFAFA",
      "opacity": 0.95
    }
  },
  "colors": [
    "#8CC350",
    "#5A6EAA",
    "#D755A5",
    "#1EBED7",
    "#F0A01E",
    "#9B8CE6",
    "#3CB5A0",
    "#3287D2",
    "#F0557D",
    "#C3D250",
    "#EB782D",
    "#78B4F5",
    "#5FAF69",
    "#AA5FA5",
    "#FA5A50",
    "#F5C841"
  ],
  "xAxis": {
    "type": "linear",
    "title": {
      "text": "10 Year Standard Deviation",
      "style": {}
    },
    /* "plotLines": [{
      "width": 1,
      "value": 19,
      "color": "#ccd6eb"
    }], */
    "gridLineWidth": 0,
    "lineWidth": 0,
    "tickWidth": 0
  },
  "yAxis": {
    "type": "linear",
    "title": {
      "text": "10 Year Annualized Return",
      "style": {}
    },
    /* "plotLines": [{
      "width": 1,
      "value": 50,
      "color": "#ccd6eb"
    }], */
    "gridLineWidth": 0
  },
  "series": [{
    "marker": {
     ...