wow. Surprised to see #nintendoDS homebrew running in the browser at itch.io ... possibly using https://github.com/js-emulators/desmond.

Haven't managed to make it run myself for my own software ...

GitHub - js-emulators/desmond: Embed a Nintendo DS emulator easily. (Embeddable version of DeSmuME-wasm)

Embed a Nintendo DS emulator easily. (Embeddable version of DeSmuME-wasm) - js-emulators/desmond

GitHub
(credits to https://brig78cx.itch.io/boulder-crash-ds to have shown me that it was possible ...)
Boulder Crash DS by BriG78cx

3D Nintendo DS Game for R4 Card or Emulator

itch.io