CSS comments cause weird effects

Question

Can anyone explain why using comments like this in css cause really weird effects SOMETIMES?

---

This works fine

/*  ------------------------------  */
/*  some text here                  */
/*  ------------------------------  */

---

This appear to work fine too until I reload a page and then the page is all messed up in firefox and in chrome if I use any comments like this in css

<!-- sometext here -->

Answer 1

For CSS files.

<!-- -->

Is not a comment syntax.

Answer 2

Why are you using XML-like comment blocks in CSS? Your first form (/* comment */) is the only one supported in CSS.