basic html/css/js

Whoa, that's cool =) I animated those bars too, except I used pseudo-element. But I was trying to figure out how to animate counter and yes - intervals! I'll bookmark your solution =)

By the way, width can be animated via transition, isn't it? It's definitely doesn't work with height, but I guess it should work with width.

Well, so that my comment is not completely useless, I noticed that you have spna tag. Fun fact - browser renders unknown tags as non-semantic inline elements (which is what span is). That's it.

yes, transition works with width, but the thing I learned from building this is that the one key difference between transition and animation is that transition is "passive", it needs to wait for something to happen first, like state change :hover, or event occurs like click, whereas animation is more "active", it triggers immediately when the element gets rendered, that's why I chose animation over transition in this case.

thanks for the fun fact :D