What javascript framework is google images using for pinch zoom?

Question

Google has now implemented a very unique pinch zoom for their images. The viewport meta tag does not allow user scaling or zooming, and as you would expect the resulting content is not pinch-zoomable on a mobile touch device. The image, however, is pinch zoomable. The image is the only part of the page that zooms, and the viewport scaling never changes. Does anyone know what javascript framework they are using to accomplish this? Is it publicly available?

Answer 1

I don't think their version is opensource, however this library is pretty nice:

https://openseadragon.github.io/