Hi there! You've stumbled across a treasure of demos for the the TwigComponent and LiveComponent libraries! Fun!
If you want to see how this system works - including watching forms automatically validate themselves as you type... with zero custom JavaScript, it's all waiting for you here.
Let's get going!
git clone git@github.com:weaverryan/live-demo.git
cd live-demo
composer install
yarn install --force
yarn watch
Prep the SQLite database:
php bin/console doctrine:schema:create
php bin/console doctrine:fixtures:load
Then start the built-in web server:
symfony serve -d
symfony open:local
Have fun!
If you have ideas or find a problem, you can open an issue on https://github.com/symfony/ux