https://github.com/DSekon/DReadMore
The DReadMore v2.0.0 was released TODAY. I didn't come back to it for a long time. I thought that no one would need it. But I noticed that someone put a star and wrote in the issue. I am very happy.
Therefore, I converted the DReadMore for native javascript and fixed the bugs.
Next, I have a plan to make a normal website for the readmore plugin. The site will be available via the link https://dreadmore.dsekon.com