codepen

 codepen  is a silo for hosting HTML, CSS and JavaScript snippets to demonstrate the capabilities of the client-side Web.

Features

 * Profile
 * rel-me linking to multiple other sites! E.g. https://codepen.io/adactio

Depends on AWS
(though that’s true for many sites)
 * Criticism: depends on AWS (and thus vulnerable to their outages) https://twitter.com/AndreJaenisch/status/1331901136245305345
 * "Imagine CodePen going down. Or Amazon having yet another outage *cough  You are stuck.  If you have different domains hosting code, the whole system becomes more resilient to failures (the original motivation behind the Internet)." @AndreJaenisch November 26, 2020