On: Gosub – An open-source browser engine

[pests]

Just as a data point, the YouTube app on most TVs and devices is a stripped down browser only supporting exactly the HTML/CSS/JS needed to run the big picture client.

By tighter integration with the final product, the browser can provide specialized elements or APIs to simplify the actual application code.

I think it's used a few other places as well.

[madeofpalk → pests]

Most smart tv apps are just web apps. YouTube isn’t particularly unique in that regard.

Even the old pre-tvOS Apple TV apps were kinda web apps - XML and JavaScript delivered over HTTP

[pests → madeofpalk]

I do agree TV apps are mostly web apps, but most of them did not run in a browser that was specifically designed for that single app.