If your code still doesn't work, you could try changing this :
<script type="text/javascript" src="js/highcharts.js"></script>
with this :
<script type="text/javascript" src="https://code.highcharts.com/stock/highstock.js"></script>
and you can add this :
scrollbar: {
enabled: true
},
finally, you can add this for how many data points you want to view at a time, example " min: 6 " :
xAxis: {
categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
min: 6 <!-- LOOK at this -->
},
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