outline-color property is used to specify the color of an element's outline.
Unlike an element's border (e.g. set using
border or its associated properties), an element's outline does not take up extra space and it can be non-rectangular.
The outline is always on top of a box, and it does not influence the position or size of the box, or of any other boxes. Therefore, displaying or suppressing outlines does not cause reflow or overflow.
User agents typically render an outline on elements in the
This value specifies the color of the outline. It can be any valid color.
This value performs a color inversion on the pixels on the screen. This is to ensure the focus border is visible, regardless of the background color.
If the user agent does not support the
invertvalue, the initial value of the
outline-colorproperty is the currentColor keyword.
In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:
- Represents the value specified as the property's initial value.
- Represents the computed value of the property on the element's parent.
- This value acts as either
initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.
- Initial Value
- Applies To
- All elements
- Visual, Interactive
- Yes (see example)
The CSS spec warns against removing the outline on elements in the
Keyboard users, in particular people with disabilities who may not be able to interact with the page in any other fashion, depend on the outline being visible on elements in the
:focusstate, thus authors must not make the outline invisible on such elements without making sure an alternative highlighting mechanism is provided.
- CSS Basic User Interface Module Level 3 (CSS3 UI) (W3C Candidate Recommendation, 02 March 2017)
- CSS Level 2.1 (W3C Recommendation 07 June 2011)