Here are examples of images that normally appear with a Web App export from InDesign and in5.
E.g., for a non-mobile device:
E.g., on an iPad to install to the Home Screen.
Removing the device limitations and install screens
If you don't want the Web App to be limited to mobile devices, and/or you'd like to remove the instructions screen, the following bit of custom code changes the output so that image of instructions doesn't appear and the page simply loads as a web page (but still allows the Web App installation on supported devices).
Attach the following as a .js file in the Resources section of the in5 dialog:
limitWebAppToDevice = false;
More info on attaching a .js file: How to attach resources
Alternatively, if you want to temporarily bypass the install screens (on any device) and treat the content like a web page (instead of a WebApp), you add ?webapp=0 to the end of the URL (e.g., http://example.com/myapp/index.html?webapp=0).