$ go install golang.org/x/tools/cmd/present@latest
$ present -notes

Note: Visit the link that the present program prints out in the console (e.g. http://127.0.0.1:3999/). If you use localhost instead, then the code play might not work. There is another option that allows you to run code from go.dev/play instead, which is -use_playground.

Note: When entering multiline code in the editable code blocks, use Shift+Enter for new lines instead of Enter. Using Enter will start a new <pre> block, while Shift+Enter keeps everything within a single block as intended.