Allow isolate property to be specified in Frame

[noelwelsh]

The CSS isolate property controls how an element (in our case an SVG) blends with the background. Users may want to have access to this property. Adding it to the SVG Frame is the natural place to make it available. The ideal solution would allow the user to set arbitrary CSS styles, perhaps reusing what ScalaTags provides for handling styles.

[arnavsharma990]

Just to confirm , should the initial implementation focus specifically on exposing the isolation property, or is the goal to support arbitrary CSS styles on Frame more generally?

I was thinking of exposing the isolation property first and then supporting arbitrary CSS styles in a follow up PR

[noelwelsh]

It's down to whatever seems best to the person doing the work. I think ScalaTags has some support for styles that could be easily used to implement this, but I don't know the details.

[arnavsharma990]

As this issue relates to the SVG backend work currently in the GSoC selection queue, I’ve moved my PR to draft for now. The selected candidate can reach out if any help is needed.