Should have done 150.

We can use `shape()` to carve away the edges of an element to look like a folder tab. By hand.

CSS has counter variables (based on matching selectors) that you can output as formatted content or use in calculations.

With view() style scroll-driven animations, it’s helpful to think about how you want it to work then tweak the ranges toward that goal.

You want to hide an interactive element that you don’t need anymore after JavaScript loads/runs. Can you do it without a “flash” or layout shift?

Inset `box-shadow` doesn’t work directly on image elements. There are work-arounds, but this SVG filter can do it directly.

Don’t run! There is powerful stuff to learn here through interactive demos.