When you write code in sightly file in .html file, a Java file will be generate with the help of it. That will be done by sightly engine.Those files can be found here /var/classes/dd8d5f1b-8f16-4378-a712-accecb264070/sightly/1.0.2/appsWhen you write JS-USE api, it will be rendered by Rhino engine.Th...