I've asked this before, but don't think I've ever gotten a concrete answer for this. I need to do this, since I will have a function to delete savedata for my Zelda Gamekit. As in the system save/load actions with the engine.
I know from the manual that the save/load savegames are not stored in browser cache (but WebStorage or IndexedDB, instead), which are permanent storages and not affected by clearing browser cache.
Due to that, I'm not sure if there's an easy way to clear savegames, whether it's an expression or some contrived hidden feature I'm not knowing about.