no, it's not about the music composer vivaldi, it's about a new upcoming browser vivaldi.
based off on Opera / Chromium the upcoming https://vivaldi.com/ is supposedly the fastest man .. i mean browser alive.
team that develops vivaldi used to develop opera long time ago, and inside vivaldi they are offering a load of features that do not come with chrome / opera and are usually extended.
my question to people here is: do you intend to test your games in this browser? would you like to see it on a mobile platform?
also.. do people test their games on other then firefox/ie/chrome browsers? i've tested them on opera and sometimes they seem'd broken, but after update they usually work, because they probably update the chromium engine behind it. also i've never seen a browser hit 555 mark (any browser) in the html5 feature test.
if there was a browser that had full support over all 555 features, would we see a performance increase / improve through it? would we have better / faster working features?