For this little example ,

from PySide6 import QtCore, QtWidgets, QtWebEngineWidgets
# or
# from PySide2 import QtCore, QtWidgets, QtWebEngineWidgets


class BetterWebView(QtWebEngineWidgets.QWebEngineView):
    def __init__(self):
        super().__init__()
        self.load(QtCore.QUrl())
       

if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    view = BetterWebView()
    view.load(QtCore.QUrl("https://www.qt.io"))
    view.show()
    sys.exit(app.exec_())

after running it, I got a list of errors like

[12248:2260:0721/112136.109:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.110:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
js: While parsing speculation rules: A rule contains an unknown key: "eagerness".
[12248:2260:0721/112136.411:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.412:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.414:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.416:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.443:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.444:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.758:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112136.760:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112141.494:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112141.494:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112141.497:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107
[12248:2260:0721/112141.498:ERROR:ssl_client_socket_impl.cc(975)] handshake failed; returned -1, SSL error code 1, net_error -107

They are not helpful in my case, I wonder how to suppress(not show) them?