My group recently migrated from classic to New Google Sites. There were many things I was doing with classic sites and/or apps script's Sites Service I can't do
moniker
ssh-keygen
drf-spectacular
array-indexing
redhat-containers
xc8
ssh-config
ibm-data-studio
axi4-stream
kendo-datasource
findelement
config-transformation
cfs
cunit
shared-module
upstart
x264
jest-mock-extended
mongo-shell
avsc
firefox-os
template-templates
active-window
jdedwards
anydac
mailchimp
live-templates
training-data
threat-model
jqxgrid