src/ol/source/IIIF.js contains a tile source for IIIF Image API services.
It supports Image API version 1 and 2 on compliance levels 0, 1 and 2.
To get working constructor options for IIIF from an IIIF image info.json,
use src/ol/format/IIIFInfo.js.
An example is available in examples/iiif.html respectivly examples/iiif.js.