Disclosed herein are device, system and method embodiments for managing accessibility on customer web pages. A user device operates by receiving selection of a control of an embedded application presented in a webpage including visible content, receiving configuration code associated with the embedded application instance, and presenting a modal dialog on the webpage generated based on the embedded application instance and the configuration code. Further, the user device disables access by an assistive technology to Hypertext Markup Language elements associated with the visible content in response to the presentation of the modal dialog.