This is completely wrong. Triple quotes in Python indicate a string. It happens to be able to be used for a multi-line comment because it officially leaves no artifact in the AST if it's not assigned to anything (can't find the documentation for this atm).

/ * ... * / is a comment in Javascript. Changing it to mean multi-line string is a terrible idea.

This list of changes to Javascript borrows so much from Python I'm surprised they didn't also borrow Python's multi-line string syntax.