Inter-context coordination to facilitate synchronized presentation of image content is described. In example embodiments, an application includes multiple execution contexts that coordinate handling user interaction with a coordination policy established using an inter-context communication mechanism. The application produces first and second execution contexts that are responsible for user interaction with first and second image content, respectively. Generally, the second execution context provides a stipulation for the coordination policy to indicate which execution context is to handle a response to a given user input event. With an event routing policy, an event routing rule informs the first execution context if a user input event should be routed to the second execution context. With a pixel authorization policy, a pixel authorization grant informs the first execution context of an authorization to manipulate pixels of the second image content in response to a user input event affecting pixels of the first image content.