how to shuffle characters in heading title like it's deciphering?

Question

I came across this news yesterday when I open it, the title of the post shuffle like it's deciphering, after few seconds original titles appear. Here is the link: https://www.washingtonpost.com/graphics/2020/world/national-security/cia-crypto-encryption-machines-espionage/
Is it JavaScript?
Question is: If it's JavaScript how can fetch its code? How this function is working?
here is the sample gif/mp4: https://i.imgur.com/64zUkPz.mp4

Answer 1

https://www.sololearn.com/post/97946/?ref=app
https://code.sololearn.com/WKKkpq0efxai/?ref=app