Add Multi-Element Wrapper Class With CKEditor in Drupal 8
The task at hand here is to allow the client to create a classed wrapper around multiple elements using CKEditor in Drupal 8.
The fundamental problem here is the CKEditor's built in "Styles" dropdown classes each <p>
individually, while we need a class wrapping them.
You could probably make or install your own CKEditor plugin, but that's not what I did.
I did this with Javascript.