Press right mouse button on the instances of web-applications. The Finite State Machine of web-applications can be in different states. Call context menu near the right side of the screen (web-app). Context Menu API solves the problem of the web-page dialog window (window.showModalDialog). Since the choice of menu command - an indirect user check. Unfortunately, experts of the international community W3C confuse things like "navigation menu" of the site and the "context menu" of web-application.
1st instance of canvas or svg web-app
2nd instance of canvas or svg web-app
3rd instance of canvas or svg web-app
Dialog Window API prototype 4 HTML5 web-app