When claiming copyright, you should mention the date of first publication and if applicable, the last significant revision. Not the current date.

Tangential, but what's the state of web components at the moment? As a backend engineer, they were very appealing early on since I didn't want to deal with adding an entire framework onto a simple project. How'd that work out? It seems like the big frameworks are still kind by a mile and they provide a much easier developer experience still. Am I wrong there?

Is there a good reason to use a shadow root for this instead of just directly setting innerText

There are some issues with this code: https://gist.github.com/ceving/6e65886e04563ed9e6e42cc5f8d3f...

Safari has support for "is" attribute now?

Is it necessary to use a web component to do what you could do with a snippet of Javascript? What is the use case for this?

Excellent example for someone trying to wrap their arms around web components.

this code isn't what's rendered. there's something about `this.textContent - ${year}` but that's not what we're seeing in output.