Custom tile renderers

[prushforth]

I didn't know where to put this, so for discussion, and potential relocation if necessary.

Many (all?) of the commercial content providers you use in the examples for this document deploy custom content rendering, using WebGL and custom server formats e.g. MVT, Google geobuffers and who knows what else.

Assuming that these providers won't be changing those renderer any time soon, a map solution for Web maps will, if it wants to incorporate these custom formats without asking the platform itself to support them directly, will have to be able to allow script or WASM to render content, perhaps in a "tile" event or something along those lines. In other words, the map solution will have to work with libraries to support custom client side rendering.