… Okay, I just read this, and now I feel like a doof. I’ve been using a 9th-generation iPad this entire time. Your “several machines” point brought it to the forefront of my mind, and then it made sense to me why I couldn’t get it to work.
Ahh yeah, I haven't gotten it to run on mobile browsers, or at least on iOS. I'd like to get that working at some point...