outline-color

The outline-color CSS property sets the color of the outline of an element. An outline is a line that is drawn around elements, outside the border edge, to make the element stand out.

/* Keyword values */
outline-color: invert;
outline-color: red;

/* Global values */
outline-color: inherit;
outline-color: initial;
outline-color: unset;

Initial value	`invert`, for browsers supporting it, `currentColor` for the other
Applies to	all elements
Inherited	no
Media	visual, interactive
Computed value	For the keyword `invert`, the computed value is `invert`. For the color value, if the value is translucent, the computed value will be the `rgba()` corresponding one. If it isn't, it will be the `rgb()` corresponding one. The `transparent` keyword maps to `rgb(0,0,0)`.
Animation type	a color
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

Values

<color>: See <color> for the various color keywords and notations.
invert: To ensure the outline is visible, performs a color inversion of the background. This makes the focus border more salient, regardless of the color in the background. Note that browsers are not required to support it. If not, they just consider the statement as invalid

Formal syntax

<color> | invertwhere 
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where 
<rgb()> = rgb( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<rgba()> = rgba( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<hsl()> = hsl( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<hsla()> = hsla( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<named-color> = transparent | aliceblue | antiquewhite | aqua | aquamarine | azure | beige | bisque | black | blanchedalmond | blue | blueviolet | brown | burlywood | cadetblue | chartreuse | chocolate | coral | cornflowerblue | cornsilk | crimson | cyan | darkblue | darkcyan | darkgoldenrod | darkgray | darkgreen | darkgrey | darkkhaki | darkmagenta | darkolivegreen | darkorange | darkorchid | darkred | darksalmon | darkseagreen | darkslateblue | darkslategray | darkslategrey | darkturquoise | darkviolet | deeppink | deepskyblue | dimgray | dimgrey | dodgerblue | firebrick | floralwhite | forestgreen | fuchsia | gainsboro | ghostwhite | gold | goldenrod | gray | green | greenyellow | grey | honeydew | hotpink | indianred | indigo | ivory | khaki | lavender | lavenderblush | lawngreen | lemonchiffon | lightblue | lightcoral | lightcyan | lightgoldenrodyellow | lightgray | lightgreen | lightgrey | lightpink | lightsalmon | lightseagreen | lightskyblue | lightslategray | lightslategrey | lightsteelblue | lightyellow | lime | limegreen | linen | magenta | maroon | mediumaquamarine | mediumblue | mediumorchid | mediumpurple | mediumseagreen | mediumslateblue | mediumspringgreen | mediumturquoise | mediumvioletred | midnightblue | mintcream | mistyrose | moccasin | navajowhite | navy | oldlace | olive | olivedrab | orange | orangered | orchid | palegoldenrod | palegreen | paleturquoise | palevioletred | papayawhip | peachpuff | peru | pink | plum | powderblue | purple | rebeccapurple | red | rosybrown | royalblue | saddlebrown | salmon | sandybrown | seagreen | seashell | sienna | silver | skyblue | slateblue | slategray | slategrey | snow | springgreen | steelblue | tan | teal | thistle | tomato | turquoise | violet | wheat | white | whitesmoke | yellow | yellowgreen
<deprecated-system-color> = ActiveBorder | ActiveCaption | AppWorkspace | Background | ButtonFace | ButtonHighlight | ButtonShadow | ButtonText | CaptionText | GrayText | Highlight | HighlightText | InactiveBorder | InactiveCaption | InactiveCaptionText | InfoBackground | InfoText | Menu | MenuText | Scrollbar | ThreeDDarkShadow | ThreeDFace | ThreeDHighlight | ThreeDLightShadow | ThreeDShadow | Window | WindowFrame | WindowText
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>

Example

HTML

<p class="example">My outline is blue, da ba dee.</p>

CSS

.example {
  /* first need to set "outline" */
  outline: 2px solid;
  /* make the outline blue */
  outline-color: #0000FF;
}

Live:

Specifications

Specification	Status	Comment
CSS Basic User Interface Module Level 3 The definition of 'outline-color' in that specification.	Candidate Recommendation	No change
CSS Transitions The definition of 'outline-color' in that specification.	Working Draft	Defines `outline-color` as animatable.
CSS Level 2 (Revision 1) The definition of 'outline-color' in that specification.	Recommendation	Initial definition

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0	(Yes)	1.5 (1.8) [1]	8.0	7.0	1.2 (125)
`invert` value	No support	?	No support [2]	8.0	No support [3]	No support

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	(Yes)	?	?	?	?

[1] In versions previous to Gecko 1.8: -moz-outline-color.

[2] Support had been dropped in version 3.0 (1.9).

[3] Supported in Opera 7 but support was dropped in Opera 15 with the adoption of Chromium/Blink engine.