score:23

Accepted answer

As far as I can recall jQuery's .html() makes use of innerHTML which is meant for html, not svg. SVG's are xml documents, so you can use XMLSerializer()

var svg = document.getElementById('svg_root'); // or whatever you call it
var serializer = new XMLSerializer();
var str = serializer.serializeToString(svg);

score:0

For the problem you are not getting your svg content,
If only one svg chart is on page then use:

$('svg').html();

and if more than present then please see there is a div of highcharts_container because they create that svg charts. If you are using them.
Then use:

$('id of that div').html();

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