html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var chart = anychart.area();

​

    var series = chart.rangeStepArea([

        {x: "January", low: 3093, high: 19522},

        {x: "February", low: 8205, high: 32622},

        {x: "March", low: 4019, high: 41612},

        {x: "April", low: 6920, high: 53752},

        {x: "May", low: 12684, high: 31917},

        {x: "June", low: 14924, high: 42052},

        {x: "July", low: 7933, high: 69812},

        {x: "August", low: 15573, high: 59922}

    ]);

​

    // Set high stroke.

    series.highStroke(function () {

        return "3 " + anychart.color.darken(this.sourceColor);

    });

​

    chart.title("Set high stroke parameter as a function");

    chart.container("container");

    chart.draw();

});