from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets
import os
path = os.path.join(os.getenv('APPDATA'), 'test')
os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = f"--disable-gpu-shader-disk-cache,--disable-logging,--user-data-dir={path},--force-dark-mode"
app = QtWidgets.QApplication(["--disable-gpu-shader-disk-cache",
                              "--disable-logging",
                              f"--user-data-dir={path}",
                              "--force-dark-mode"])
x = QtWebEngineWidgets.QWebEngineView()
x.load(QtCore.QUrl('http://example.com/'))
x.show()
app.exec_()