At least! The app open in my Lumia 1020 with WP 8.1.1 Developer Preview, but some pages renders terrible, for example wpcentral.com, others as carscoops.com or winbeta.org presents some glitches with the images and some HTML elements and in my own website pirelaneuman.com I have a JavaScript to go to top with a smooth scroll, when press the go to top button the app open a new tab with my website on top, isn't the correct behavior, the experience isn't stable as expected...