Actually I'm a mechanical engineer, but also a self-made "fullstack developer" with decent skills in HTML, CSS and JS, and messing around with PHP and PostgreSQL at the back-end.

If you have a question:

• Never write "It doesn't work" to the question, include an explanation of what goes wrong instead.
• Reading the documentation is always useful
• NaN is not an error, it's a value
• Don't minify your developement code

Also: When responding to a comment or an answer, please think faster than you write!