I wonder why those complementary languages (HTML, CSS, Javascript) have different ways of commenting. They could have made it simple! :)

Answer 1

They weren't designed to be complementary from the start. So, these languages had different origin. Only after a while it turned out that the stack of HTML/CSS/JS make sense together.

Answer 2

This is a very good point. Sometimes I wish that the commenting was the same, but then I remember that these technologies / languages were created at different time periods and all "technically" run in different contexts - which works to explain the differences.

Answer 3

in JavaScript /*comment*/ just like in CSS