Lightbox, modal window, dialog, overlay… There are many names used to describe a component with the same (or very similar) functionality. For the purpose of this article, I will use these terms interchangeably to refer to a window which is triggered by the user, appears on top of the viewed page overlaying other content, and which must be acknowledged by the user before they can come back to the main page area. When the window is open, the rest of the page is dimmed and the user is only able to interact with that window's content.