@Marco-Trivellato @jonas-echterhoff_1 There has been many changes:
HTML Templates changes: This are not reflected in upgrade guide and I’m figuring out the way I can seeing the default ones.
SendMessage: How it’s now? My application broke.
FullScreen template: What I have to change on CSS to have a 100% wide application? I don’t get the correct combination.
The answers to your first two questions are in the embedding guide-
Currently we are working on a new embedding scheme for WebGL which should make embedding more convenient, provide namespacing for all the WebGL code in order to avoid interference with the rest of the page, and allow simultaneous embedding of...
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You are correct that there is nothing in the upgrade guide about this and there probably should be since it is a breaking change for anyone who has custom webgl templates.
Even more annoying … Unity - Manual: WebGL templates is out of date so the documentation for fixing this unannounced (?) breaking change is … missing.