Qt5 - QtWebEngine components.
For EL7:
cd '/etc/yum.repos.d/'
curl 'https://copr.fedorainfracloud.org/coprs/scx/qt5-qtwebengine/repo/epel-7/scx-qt5-qtwebengine-epel-7.repo' > 'scx-qt5-qtwebengine-epel-7.repo'
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/scx/qt5-qtwebengine/