Opera Mini was first released in 2005 as a web browser for mobile phones, with the ability to load full websites by sending most of the work to an external server. It was a massive hit, but it started to fade out of relevance once smartphones entered mainstream use.
Opera
I used this primarily on a Palm (with Palm OS, not webOS).
I think it was v4 that introduced the view with the full desktop website zoomed out where you could then zoom in to an area.