Similar to the word-spacing, this property defines the space between letter in a text block. Negative length values can be used to have less than normal space between letters. Percentage values do not work in most browsers. This property is inherited.
letter-spacing: -1px;
IE5.5+, FF1+, SA1.3+, OP9.2+
| em | Relative length value. A em unit is equal to the font-size value of the element used. |
| Percentage value | The regular format of a percentage value. |
| px | Pixel, a pixel unit represents a single dot on the screen. |