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
Removing install instructions without coding
Alternatively, if you use the Presentation Mode panel (in5 > Enhancements), you can turn on the Save to Home Screen feature without using any of the install screens shown above.
Make sure that you disable all other options, as they can interfere with normal navigation.
Temporarily test Web Apps as web pages
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).