Comment by konart

> why dont any of the modern browsers open and load pages instantaneously anymore, why does it take seconds?

If we are talking about a blog page, just a static html - it should take some ms. No problem here.

But if we are talking about some heavy pages and fetch requests to other places, well...

Or simply a page with f 10Mb header image.

>apart from gecko and v8 why dont we have browser engines?

gecko (Firefox), blink (chrome and friends), webkit (Safari, Kagi and some other, mostly linux distro browsers) are the only stable ones. Servo and Ladybird are on the way, but it will take quite some time for them to mature.

>are you familiar with anyone building an entire browser engine from scratch?

Ladybird. No idea about specifications.

>with all the GPT hype of late, why havent we seen a single GPT yet capable of building a browser engine from scratch supporting the last 20 years of html, css and js specs?

Well, aside from the fact that this will be a one expensive project - you (someone) will have to test this code anyway. Also this: https://ladybird.org/posts/changing-how-we-develop-ladybird/