On mobile devices, supporting HTML5/CSS3D technology, several options are available:
- labels (text)
- navigation (buttons and images)
It is completely transparent for the end user, the virtual tour will be displayed in the best technology for the host device. All the images are resized and ensure that they fit the device’s memory capacity.
Note that despite all these options are available, from an end user perspective, some of them proved to be unusable on small devices, such as phones. It is possible to produce different version of the same virtual tour, depending on the device screen capabilities, thus ensuring the best user experience.
You can look at examples here from your favorite mobile device.