I like how Simplepush presents a couple of different ways to generate push messages on their website:
https://simplepush.io/#libraries
How about having a similar feature directly in the server GUI? That would include the bits documented here https://gotify.net/docs/pushmsg
https://scotthelme.co.uk/a-new-security-header-feature-policy/
I guess it will be easy to add, because we certainly don't use any of these features.
Or maybe "gyroscope" or so may be used by the random number generator in sjcl, but that's all.
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I saved an article (https://www.senat.fr/rap/r08-388/r08-38823.html) in my wallabag and I think that borders on tables should be kept.