Web parts are ASP.NET controls that can be added to web part zones. They are generally distributed as WSP files. Pre-2013, they could be developed off the hosting server. With 2013, WebParts for the most part have to be developed the hosting server for proper library inclusion.
I'm trying to display a list view inside a client web part (for SharePoint hosted App). The below code will work inside an app page but does not render in a client web part. There are no errors ...