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I’m currently using it in a browser called Falkon. It’s not as big as Firefox or Chrome, but it is endorsed by KDE. Also, Apple’s Safari is using something similar.
Not at all.
Safari is using WebKit, which they based on KDE’s old KHTML engine, which is now discontinued.
Falkon uses qtwebengine which is Chromium’s web engine + integration with QT user interface.
A Linux browser that uses WebKit (like Safari) is GNOME Web.