ElementStacks

HTML

<script src="http://highcharts.com/js/testing-exporting.js"></script>
<div id="container" style="height: 400px; margin-top: 1em"></div>

JavaScript

var chart = new Highcharts.Chart({
    
    chart: {
        renderTo: 'container'
    },
    
    credits: {
        enabled: false
    },
    
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    
    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]        
    }],
    
    exporting: {
        buttons: [
            {
                symbol: 'diamond',
                x: -62,
                symbolFill: '#B5C9DF',
                hoverSymbolFill: '#779ABF',
                _titleKey: 'printButtonTitle',
                onclick: function() {
                    alert('click!')
                }
            }
        ]
    }
    
});

console.log( Highcharts.Renderer.prototype.symbols )