Investigate if we want to use context-fill and context-stroke for rendering markers

[marstamm]

What should we do?

Check if we can use context-fill and context-stroke for coloring markers. This is part of the SVG 2 standard, but browser support is not documented well.

• Test common browsers for support
• Decide if we want to remove local rendering of markers in favor of styling with the path

Why should we do it?

Can potentially simplify our rendering

related to camunda/camunda-modeler#4307, #2179

[marstamm]

I tested a simple demo to check which browser (and what version) supports this feature. I used browserstack for this.

• Firefox: >=111 (Mar 2023)
• Edge: >=124 (Apr 2024)
• Chrome: >=124 (Apr 2024)
• Opera: no support
• Safari: no support
• Electron: >=30 (Chrome 124)

We already build on Electron 30, so it would work in the desktop modeler.

While we officially only support browsers where we can use this feature, the overall support is limited and only adopted recently by chromium.

Let's not move on this now

[marstamm]

As discussed in #2183 (comment), this is not feasible right now. We can revisit if the Browser support improves. Until then, we have a solid solution with individual marker rendering.

Closing as not planned (no refactoring issues).