PROCESSING AN INPUT EVENT WITHIN AN APPLICATION

Processing an input event within an application includes detecting an input event within an application executing on a first thread, the input event being associated with an event handler. A separate execution corresponding to a current state of the application is performed on a second thread based on the event handler associated with the input event. Within the separate execution, a determination is made whether the event handler modifies at least one of a document associated with the application or a default behavior of the application. In a case where the event handler does not modify at least one of the document or the behavior, the subject technology refrains from invoking the event handler on the first thread.