Feature request: support style='background_color:xxxx' in the <svg> object

It would be very nice if the background of the SVG was respected

Like
```
<svg height="100" width="100" style="background-color:green"> 
            <circle cx="50" cy="50" r="40" stroke="black" 
                    stroke-width="3" fill="red" />
</svg>
```

This is an example in https://www.geeksforgeeks.org/how-to-set-the-svg-background-color/
