In order to debug the LG webOS display, follow the steps below:
Open LG webOS device detail in Box
Navigate to Troubleshooting Tab
Click "Native Debug"
Open older Chromium
In Chromium open http://IP-OF-THE-DISPLAY:9998 URL
Chrome inspector will show up
In case you won't be able to run the debugging session, make sure that URL with the ip address and port doesn't contain the https protocol. It may block the debugging site. Use only HTTP for the debugging session.
If you are not allowed to open native debug URL in the latest Chrome, launch the Chrome with the following command/flag chromium-browser --enable-blink-features=ShadowDOMV0,CustomElementsV0
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