What are three valid ways to exchange data through a Pega Web Mashup?

In a Pega Web Mashup, valid ways to exchange data include using an action object configured as a script to perform additional actions on a web mashup gadget (A), utilizing the Javascript function doAction() to set or read data values through the hosting web page (B), and using the data-pega-event-onpagedata attribute to configure default values for the gadget (E). These methods facilitate dynamic interaction between the mashup and the hosting web page, allowing for seamless data exchange and integration of Pega functionalities into external web applications.References: Pega Community documentation on Pega Web Mashup and integration techniques.