I tried to use WebDisplays and MCEF mods together in forge 1.12.2 (The mods version was 1.11 for MCEF and 1.1 for Webdisplays) It loaded properly, opened a world, and i got the webdisplay, mouse, ...

This is the WebDisplays mod for Minecraft 1.12.2. I don't have time to maintain it anymore, so I changed the license recently and anybody is welcome to create forks and/or re-distribute it. For more ...