Why do /**/ comments work in stylesheets but // comments don't?

Question

Is there a good reason for this? Lame question, but I just wondered if there was a reason why.

Answer 1

Different languages have different specifications with different functionality. In another language you may have comments that start with # instead of //.

See the specification.

4.1.9 Comments

Comments begin with the characters /* and end with the characters */. They may occur anywhere between tokens, and their contents have no influence on the rendering. Comments may not be nested.

CSS also allows the SGML comment delimiters () in certain places defined by the grammar, but they do not delimit CSS comments. They are permitted so that style rules appearing in an HTML source document (in the STYLE element) may be hidden from pre-HTML 3.2 user agents. See the HTML 4 specification ([HTML4]) for more information.

Note: There is no mention of comments that begin with 2 slashes and end at the line break. So that's why it's not supported.