Using the Pop-Up Component
In this section we implement some pop-up functionality for our tabbed page. First of all, you need to create a component. The underlying mechanism—
component just allows you to show and hide a pop-up, but you must define the pop-up yourself; it is not built in as part of the behavior or component (that’s why it fits in both categories).
Implementing the pop-up requires you to complete the following steps:
Define the pop-up in HTML as an element to display ...