From what I've heard Microsoft Edge looks like such attempt. When a site requires some kind of compatibility mode, the not-so-good-but-indeed-old IE is spawned

From what I've heard Microsoft Edge looks like such attempt. When a site requires some kind of compatibility mode, the not-so-good-but-indeed-old IE is spawned to serve it. Great approach and I hope they set the bar high to make the common use case faster. My ideal browser would support only something like "use strong" from [1] and spawn Netscape 4.0 for all pages that abuse JS. [1] https://developers.google.com/v8/experiments https://developers.google.com/v8/experiments