Here is a cool variable font text animation effect by Tyler Durrett, where the text moves like a wave going from thin to thick font and also changes colour like a neon rainbow with some gradient effect. It uses splitting.js to create this effect.
If you are having trouble with the pen, try the archived copy on GitHub
If the path before you is clear, you’re probably on someone else’s.Joseph Campbell
Gradient Neon Text Snippet
See the Pen Variable Font Fun (CSS Animation Version) by Tyler Durrett (@electricgarden) on CodePen.default