I've been using https://codesandbox.io/ pop up a lot. Repl has always been my favorite as well for other backend languages
My goto will always be codepen though if its purely frontend. It just has the nicest UX interface and works really well.
Funny thing about codepen is I also use it as a CDN too.
I'll grab my compiled single CSS file from my main github repo, and paste it into a new codepen file. Then on a new codepen, I'll link that CDN codepen so I can isolate and make a webcomponent, while still adhering to my original CSS. I use the commit# / merge# to keep track between the main git repo VS the codepen CDN file
My goto will always be codepen though if its purely frontend. It just has the nicest UX interface and works really well.
Funny thing about codepen is I also use it as a CDN too.
I'll grab my compiled single CSS file from my main github repo, and paste it into a new codepen file. Then on a new codepen, I'll link that CDN codepen so I can isolate and make a webcomponent, while still adhering to my original CSS. I use the commit# / merge# to keep track between the main git repo VS the codepen CDN file