ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="border: 1px solid #000;">
    <div id="chart"></div>
</div>

CSS

.ui-resizable-se {
    width: 100px;
    height: 100px;
    background-color: red;
    float: right;
}

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'chart'
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    
    series: [{
        type: 'line',
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 144.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
        name: 'Temperature'
    }]
}, function(chart){

    $('#container').resizable({
        resize: function(){
            //console.log($(this).height())
            chart.setSize( $(this).width(), $(this).height())
        }
    });
    
});