Hi Arnab,
If being able to convert a viz chart to svg file format is good enough then you have 2 options:
1. Right click on the chart rendered in browser say IE9 and choose the option "Save Picture As", this will allow you to save the chart as an svg file which you can open in a browser or embed in html page as per your requirement.
2. If you have to do it programmatically say for a feature like "Preview" of a chart, then you can extract the svg node of the html document in which you have rendered the chart. You can then create a clone of the svg node and write it to a new browser window.
Hope this helps!
Regards,
Ria