The Apple stock price from 2006 to 2011. There was a series of new product releases over this time.
The span for the recession is made with a rectangular annotation with very subtle styling so it doesn't interfere with the line.
The badge annotations note the release dates. They could also be used as markers for comments by the author or audience.
Made with d3.annotation().
https://d3js.org/d3.v4.js
https://cdnjs.cloudflare.com/ajax/libs/d3-annotation/1.12.1/d3-annotation.min.js