As per usual, there are solutions for all challenges
Can you get the page to calculate 7*7 and output 49 all on it's own?
Can you also get a pop-up? This will require you to escape the sandbox.
XSS Demo Application

XSS Demo Application

Welcome to the interactive application. Explore the functionality and look for creative ways to interact with inputs.

Safe Display Section

Here, the input is securely escaped to prevent XSS:

Other Parameters

Parameter 1 (name): John Doe

Parameter 2 (action): Viewing

Parameter 3 (mode): Read-Only

Interactive JavaScript Section

This application also uses AngularJS for dynamic rendering. Try experimenting with Angular expressions.

Angular Echo: {{dynamicInput}}