Define a method of communication between FCC's iframe and the main application.
FCC sends events for challenge ready (when the challenge is visible to the user) and challenge completed (when user submitted the code and goes to next step)
FCC listens to an event to update it's url according to main app's UI state
https://topcoder.atlassian.net/browse/PROD-2173
Define a method of communication between FCC's iframe and the main application.
FCC sends events for challenge ready (when the challenge is visible to the user) and challenge completed (when user submitted the code and goes to next step) FCC listens to an event to update it's url according to main app's UI state
Related FCC PR: https://github.com/topcoder-platform/freeCodeCamp/pull/8