This is superb! I have a small tool with a web frontend, that I use a specific emoji to represent but I didn’t have a favicon yet, because if I used a PNG of an emoji that Apple made I’d be infringing on their copyright.

Using SVG and having the browser and OS provide the rendering of the emoji is perfect for the favicon of my tool!

A quick search says it's possible to get the PNG data URL from a canvas. I wonder if it's viable to draw an emoji to a canvas, and extract the PNG out of it for the favicon.

Would a lawyer go after "client-side copyright infringement"?