I tried using qtwebengine 5.4.2 with Distro built with Yocto Project and even test with Ubuntu Kill Official of the Raspberry PI.

Widget application works, but is QtWebEngine opens with black background with the following second plane messages.



This plugin does not support createPlatformOpenGLContext!
Some features may not be available.
[1012/185921:WARNING:resource_bundle.cc(286)] locale_file_path.empty()
QOpenGLWidget is not supported on this platform.
[1012/185921:ERROR:resource_bundle.cc(639)] Failed to load /usr/share/qt5/qtwebengine_resources.pak
Some features may not be available.
[1012/185921:WARNING:resource_bundle.cc(286)] locale_file_path.empty()
This plugin does not support createPlatformOpenGLContext!
This plugin does not support createPlatformOpenGLContext!
QOpenGLWidget: Failed to create context
This plugin does not support createPlatformOpenGLContext!
QOpenGLWidget: Failed to create context







Cant find EGLConfig, returning null config
QEGLPlatformContext::init: eglError: 3008, this: 0x209e1f8

[1012/185941:ERROR:resource_bundle.cc(639)] Failed to load /usr/share/qt5/qtwebengine_resources.pak
Some features may not be available.
[1012/185941:WARNING:resource_bundle.cc(286)] locale_file_path.empty()
[1012/185941:ERROR:resource_bundle.cc(639)] Failed to load /usr/share/qt5/qtwebengine_resources.pak
Some features may not be available.
[1012/185941:WARNING:resource_bundle.cc(286)] locale_file_path.empty()
Cant find EGLConfig, returning null config
Unable to find an X11 visual which matches EGL config 0
Could not initialize OpenGL for RasterGLSurface, reverting to RasterSurface.
Cant find EGLConfig, returning null config
QEGLPlatformContext::init: eglError: 3008, this: 0x2168218

Cant find EGLConfig, returning null config
QEGLPlatformContext::init: eglError: 3008, this: 0x21682a0

QOpenGLWidget: Failed to create context
Cant find EGLConfig, returning null config
QEGLPlatformContext::init: eglError: 3008, this: 0x21682a0

QOpenGLWidget: Failed to create context
QOpenGLFunctions created with non-current context
Segmentation fault (core dumped)



Problems with:
-platform xcb
-platform eglfs
-platform minimalegl