Here both are using a DZI-based image-tiling system with two types of PivotViewer.
HTML OpenLink PivotViewer is quasi-device independent as a runtime is not required. Listed as 'quasi' because it is best used on 200 mm displays or larger. Nice on tablets but too big for an i-phone.
Tiled image set illustrating the change in file size as well as number of images; a geometric image series.Biodiversity Data Journal 1: e984 (16 Sep 2013) doi: 10.3897/BDJ.1.e984