How to create HTML based tooltip

I wanted to create an HTML-based tooltip having SVG content. Basically wanted to show a speedometer gauge having bad, average and good ratings with a pointing needle. The tooltip will be shown when user hover the links icon. (If two nodes connected, I’ve an icon between them on the connection and show the tooltip on hover of that icon). Any pointers will be helpful in this regards
Thanks
-Guru

You can use the HTMLInfo class to show an arbitrary HTML tooltip.

Intro page: HTML Interaction | GoJS
Tooltip intro example: HTML Interaction | GoJS
Tooltip sample: Data Visualization of Multi-Dimensional Data using Nodes and ToolTips | GoJS Diagramming Library

Thanks Hardy.