how to add comment to code that don't appear in output ?

Question

how to add comment to code
that don't appear in output ?!

Answer 1

most are
//comment
and
/* multiline
comment
*/

for ruby
#comment

Answer 2

multiline

/*CSS*/
/*JavaScript*/

single line

//JavaScript

<!--html-->

Answer 3

for most languages:

you use " //text here"

and

/*
multi line text here

*/

-------------------------

#text for ruby

<!--text for html-->

also, dont use so many tags....

Answer 4

✔

Answer 5

thanks all