Some of these problems are still due to using an old version of Chrome. Some sites only support the latest and the latest minus one and even the newest Firefox has problems, basically bad web authoring.
The title bar problem is that OS/2 doesn't support Unicode in things like window titles. Code could be added to convert the Unicode to which ever codepage the user is using. As Paul says, just finding the code to be extended is hard and there are better things to focus on.
The user agent could be a problem with the web sites parsing of it, previously we had problems with Firefox and sites serving up a mobile version as they have no idea what OS/2 is. Here you can experiment with user agents.
The other problem is Dooble has a tendency to freeze when playing some videos, don't try Youtube
It's also a good idea to regularly back up the profile, it seems to get corrupted sometimes when the system freezes.
Thanks.
About user agent, changing it under QT5 works well using the same whatsapp site.
I also found following errors:
[111:1:0826/232724.456000:ERROR:system_network_context_manager.cpp(299)] Cannot
use V8 Proxy resolver in single process mode.
[111:1:0826/232724.481000:ERROR:system_network_context_manager.cpp(299)] Cannot
use V8 Proxy resolver in single process mode.
js: Error with Permissions-Policy header: Unrecognized feature: 'interest-cohort
'.
js: Error with Permissions-Policy header: Unrecognized feature: 'interest-cohort
'.