An outline is a line that is drawn around elements, outside the border edge, to make the element "stand out".
The outline properties specifies the style, color, and width of an outline.
All CSS Outline Properties
The number in the "CSS" column indicates in which CSS version the property is defined (CSS1 or CSS2).
| Property | Description | Values | CSS |
|---|---|---|---|
| outline | Sets all the outline properties in one declaration | outline-color outline-style outline-width inherit | 2 |
| outline-color | Sets the color of an outline | color_name hex_number rgb_number invert inherit | 2 |
| outline-style | Sets the style of an outline | none dotted dashed solid double groove ridge inset outset inherit | 2 |
| outline-width | Sets the width of an outline | thin medium thick length inherit | 2 |