Proof of Concept of layered html diff

[noisy]

As a user I would like to have a possibility of visual comparison of different posts

Something like this:
https://www.jqueryscript.net/demo/Multi-image-Comparison-Plugin-For-jQuery-Sravnitel/

AC 1. Two divs with html code should be displayed one next to another
AC 2. There should be some kind of slider, which would hide/show right div over left div
AC 3. Both divs should have a height of div containing longer content