This is a beta version of migrating these workshop materials to a new platform. If you run into issues please file an issue or click on the edit link above and submit a pull request. You can use the previous version of the workshop materials as a fallback.
Read about the various named features: http://iiif.io/api/image/2.1/#features
Look at the tables for what is supported at each compliance level: http://iiif.io/api/image/2.1/compliance/
Take a look at the features supported at each level as indicated by its URI by clicking on it: