I have tried to list here all those ASCII codes I need to used quite often when working with websites. Sometimes it would take you time to find out an ASCII alternative for a particular character although I believe some of them are normally learned by heart by developers. ASCII characters are very useful in character and url encoding and are widely used and needed by developers.
| Name | Result | Code | New Alternative |
|---|---|---|---|
| ampersand | & | & | & |
| apostrophe | ' | ' | |
| asterisk | * | * | |
| quotation mark | " | " | " |
| space |   | ||
| less-than | < | < | < |
| greater-than | ( | ( | |
| left parenthesis | ' | ' | |
| right parenthesis | ) | ) | |
| at sign | @ | @ | |
| period | . | . | |
| backslash | \ | \ | |
| vertical bar | | | | | |
| left curly brace | { | { | |
| right curly brace | } | } | |
| copyright | © | © | © |
| registered trademark | ® | ® | ® |
| trademark | ™ | ™ | ™ |
| angle quotation mark (right) | » | » | » |
| plus sign | + | + | |
| hyphen/minus | - | - | |
| multiplication | × | × | × |
| division | ÷ | ÷ | ÷ |
| euro | € | € | € |
| pound | £ | £ | £ |
| dollar sign | $ | $ |
For CSS properties with numerical values, you can omit defining units for 0 value as 0 means the same in any unit.