Crystal is one of the best and elegant languages.

Everything is an expression.

HTML can be written with minimal differences.
Scoped .CSS can be written for elements in components.

200+ unique error messages to help you on the way.

Everything is typed using a simple type system

Only used parts of the code compiles into the final bundle.

Mint has a built-in formatter to format your code, it can run standalone or with the development server.

Mint contains everything you need to build the frontend of web applications from styling to data storage through HTTP requests to testing.

Testing is part of the language and there is a test runner built in which runs tests in the browser.