overlapmark
Overlapping highlights that get darker where they stack.
01Overlap gets darker
Each layer multiplies with the ones under it, whatever its color.
02Click to see every layer
A click, or Enter on a focused highlight, reports every highlight under it, not only the top one.
03Style it with CSS
Pick a preset class or write your own. Overlap still reads as depth.
04Any framework
The same DOM from vanilla JS, Vue, React and Svelte.