Seems most home entertainment manufacturers abandoned the idea pretty early on. So your hdmi cable can do it, but it’s unlikely any of us have devices to make use of it. Which is a shame
Do all TVs with Ethernet allow it
the idea is that you have one device that's connected to your router (ie the TV). then everything connected to the TV (sky box, DVD/blue-ray player, playstation/xbox) gets it's internet via the TV. i think the idea was to declutter multiple wire cables and/or reduce wireless device connections. but the idea never caught on. reading up on it, it appears some folk who require v v v long HDMI cables (eg feeding to a Sky signal into a summer house in the back garden) plug the hdmi cable into an ethernet adapter for the necessary length, have another adapter at the other end to convert it back to HDMI, then plug is into the device.
Not even sure how it’s supposed to work
The product code is F3Y023BF2M :/