| single line | mult-iline | |
| css | /* comments for single line */ | /* comments for multi-line */ |
| html | <!-- comment --> | <!-- comment for multi-line --> |
| php | use // or # for single line | /* comments for multi-line */ |
| java | // single line comment | /* comments for multi-line */ |
| python | a # begins a comment | none for multi-line |
| bash | a # begins a comment | none for multi-line |