Commenting in CSS (//) equals “none”? [closed]

No. The first example is invalid CSS, the second one valid. In CSS, you can only comment with /* and */. If you are unsure, there are tools such as CSSLint or the W3C’s CSS Validator to check your code.

Also setting a value to none or not setting the value at all is something different as well.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)