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pro-tip: if you load the charts when they are display:none, their size will be messed up (if you re-size the window it fixes it). If you have to load the chart when its display:none, you can explicitly add height and width in the init code (although percentage doesn’t work):
var chart = new CanvasJS.Chart("chartContainer",
height: 550, //in pixels
text: "Earthquakes - per month"