I have a VPS (QEMU 2.11.1, Ubuntu 18.04.5 LTS, Kernel 4.15.0-117-generic x86_64), which I access from my VPS host's NoVNC web console with Firefox 68 (Ubuntu 20.04).
The VPS host runs Proxmox with NoVNC 1.1.0-1. Because it is a VPS, I can't change anything on the host (QEMU settings, Proxmox...