How to display a popup while scrolling the page?

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Ultimately, large-scale adoption of blockchain requires a collective desire to integrate and utilize this technology. This requires not only business and consumer awareness of the benefits of blockchain, but also standardization of protocols.
Introduction to Modal Windows
While browsing the web, you have probably already come across a pop-up window (or modal window). This is a small information window that is superimposed on the screen of the visited site. It takes precedence over the content of the page and requires the user's attention until it is closed. They usually close when the user presses the Esc key on the keyboard.

It is important to note that excessive use of pop-ups can damage the user chile number screening experience. However, if placed carefully, they can be effective marketing tools. They are often used to make a promotional offer, invite to sign up for a newsletter or even suggest a contact. The display of the pop-up depends on the goal you want to achieve: sometimes while scrolling the page, sometimes when the user is about to exit the page. Thanks to JavaScript, you can program the appearance of the pop-up based on these different scenarios.

When you want a popup to appear when the user scrolls the page, there are two steps to consider:

Create the insert and hide it with HTML and CSS;
Triggering its display when the user scrolls the page using JavaScript.
With JavaScript, you can use the addEventListener method for the scroll event, which will indicate that an action should be performed when the visitor scrolls the page. Then the getElementById method will indicate that the inset should be displayed. It is also essential to give the user the option to close the popup and prevent the popup from appearing repeatedly.