In Stack Overflow, there's a useful facility for adding runnable code in HTML and JavaScript. There is a dropdown list on the left-hand side of the dialog which offers several third-party libraries. But the versions listed are pretty much all out-of-date.
For example, today I wanted to post some code which used Vue.js 3, but the options stop at 2.x and Vue.js 3 has been around for a while now.