What a great idea and a useful service: a collection of intentionally misconfigured websites for testing how browsers handle the problems.
Originally shared by François Beaufort
If you want to see how Google Chrome behaves when it stumbles upon a website with a bad SSL config, I’d recommend you bookmark https://badssl.com.
This website hosts plenty of various SSL config:
https://self-signed.badssl.com
https://incomplete-chain.badssl.com