We have seen other shuffle effect using jQuery, this is similar to that but using vanilla JS. You have a title and description field that you can add text to and when you click on the shuffle button the text rotates through a bunch of random colourful characters really quickly before revealing the message. It was designed by Sascha Sigl.
If you are having trouble with the pen, try the archived copy on GitHub
Random Character Shuffle Text Snippet
See the Pen Random Text Shuffle by Sascha Sigl (@SaschaSigl) on CodePen.0