> You may also remember browsing the web using Opera Mini, which wasn't a direct user-agent but used Opera's backend systems as a proxy that stripped, minified and compressed HTML/CSS, and resized and recompressed images. It let you browse the web using massively less mobile data, but raised a lot of privacy and security issues.

I remember how amazing that mode was on desktop, I'd sometimes enabled it on site and shrink it horizontally just to look at it handle anything perfectly. Don't remember if that was independent of the proxy though, I just cared about the removed padding and the responsiveness. Make all sites look like that and add some gutter to the side I can toggle and resize, and I'll use your browser kthx.