html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

anychart.onDocumentReady(function () {

    var data = [

        {x: 'A', value: 20},

        {x: 'B', value: 12},

        {x: 'C', value: 17},

        {x: 'A&B', value: 4},

        {x: 'B&C', value: 5},

        {x: 'A&C', value: 7},

        {x: 'A&B&C', value: 1}

    ];

​

    var chart = anychart.venn(data);

​

    // Set stroke.

    chart.stroke(function () {

        return anychart.color.setThickness(anychart.color.darken(this.sourceColor), 3);

    });

​

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

    chart.container('container');

    chart.draw();

});