It has been a while coming, but Panoramic Earth is now moving to an HTML5 panorama viewing engine. Up to now the site has been using a Flash version of KRPano. While this has proved great for several years, Flash is not well supported by mobile devices, especially if made by Apple. As the number of mobile users has increased, so this anomaly has been a growing issue.
For a while it has been possible to render equirectangular spherical panoramic images in HTML5, but not cylindrical. This meant that only part of the content of the site could be viewed with the new viewer. However, things have now moved on meaning that over the next few days all the 10,500 plus panoramas will be converted to the new version.
The viewing engine still comes from KRPano, one of the most popular panorama viewers on the market. With it come some new functions as well. Practically speaking, viewers on computers will notice little difference, but for mobile devices this will transform their user experience.