Specifies the color for an outline. An outline works similar to a border, except an outline doesn’t occupy any space, that is, it doest add to the width and height of an element. It is intended for highlighting an elements on the page.
outline-color: gray;
FF1.5+, SA1.3+, OP9.2+
| Color keyword | One of the 17 recognized color keywords; aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, orange, purple, red, silver, teal, white and yellow. |
| Hex color | Three two-character numbers in the hexadecimal system(base 16) |
| RGB decimal | Use RGB values from 0 to 255; rgb(255, 0, 333). |
| RGB percentage | Specify a color using percentage values: rgb(100%, 0%, 33%). |