The <color> CSS data type represents a color in the sRGB color space. A <color> may also include an alpha-channel transparency value, indicating how the color should composite with its background.

A <color> can be defined in any of the following ways:

  • Using a keyword (such as blue or transparent)
  • Using the RGB cubic-coordinate system (via the #-hexadecimal or the rgb() and rgba() functional notations)
  • Using the HSL cylindrical-coordinate system (via the hsl() and hsla() functional notations)

Note: This article describes the <color> data type in detail. To learn more about using color in HTML, see Applying color to HTML elements using CSS.

Syntax

The <color> data type is specified using one of the options listed below.

Note: Although <color> values are precisely defined, their actual appearance may vary (sometimes significantly) from device to device. This is because most devices are not calibrated, and some browsers do not support output devices' color profiles.

Color keywords

Color keywords are case-insensitive identifiers that represent a specific color, such as red, blue, black, or lightseagreen. Although the names more or less describes their respective colors, they are essentially artificial, without a strict rationale behind the names used.

There are a few caveats to consider when using color keywords:

  • HTML only recognizes the 16 basic color keywords found in CSS1, using a specific algorithm to convert unrecognized values (often to completely different colors). The other color keywords should only be used in CSS and SVG.
  • Unlike HTML, CSS will completely ignore unknown keywords.
  • The color keywords all represent plain, solid colors, without transparency.
  • Several keywords are aliases for each other:
    • aqua / cyan
    • fuchsia / magenta
    • darkgray / darkgrey
    • darkslategray / darkslategrey
    • dimgray / dimgrey
    • lightgray / lightgrey
    • lightslategray / lightslategrey
    • gray / grey
    • slategray / slategrey
  • Though many keywords have been adapted from X11, their RGB values may differ from the corresponding color on X11 systems since manufacturers sometimes tailor X11 colors to their specific hardware.

Note: The list of accepted keywords has undergone many changes during the evolution of CSS:

  • CSS Level 1 only included 16 basic colors, called the VGA colors as they were taken from the set of displayable colors on VGA graphics cards.
  • CSS Level 2 added the orange keyword.
  • Although various colors not in the specification (mostly adapted from the X11 colors list) were supported by early browsers, it wasn't until SVG 1.0 and CSS Colors Level 3 that they were formally defined. They are called the extended color keywords, the X11 colors, or the SVG colors.
  • CSS Colors Level 4 added the rebeccapurple keyword to honor web pioneer Eric Meyer.
Specification RGB equivalent Keyword RGB hex value Live keyword
CSS Level 1 black #000000
silver #c0c0c0
gray #808080
white #ffffff
maroon #800000
red #ff0000
purple #800080
fuchsia #ff00ff
green #008000
lime #00ff00
olive #808000
yellow #ffff00
navy #000080
blue #0000ff
teal #008080
aqua #00ffff
CSS Level 2 (Revision 1) orange #ffa500
CSS Color Module Level 3 aliceblue #f0f8ff
antiquewhite #faebd7
aquamarine #7fffd4
azure #f0ffff
beige #f5f5dc
bisque #ffe4c4
blanchedalmond #ffebcd
blueviolet #8a2be2
brown #a52a2a
burlywood #deb887
cadetblue #5f9ea0
chartreuse #7fff00
chocolate #d2691e
coral #ff7f50
cornflowerblue #6495ed
cornsilk #fff8dc
crimson #dc143c
cyan
(synonym of aqua)
#00ffff
darkblue #00008b
darkcyan #008b8b
darkgoldenrod #b8860b
darkgray #a9a9a9
darkgreen #006400
darkgrey #a9a9a9
darkkhaki #bdb76b
darkmagenta #8b008b
darkolivegreen #556b2f
darkorange #ff8c00
darkorchid #9932cc
darkred #8b0000
darksalmon #e9967a
darkseagreen #8fbc8f
darkslateblue #483d8b
darkslategray #2f4f4f
darkslategrey #2f4f4f
darkturquoise #00ced1
darkviolet #9400d3
deeppink #ff1493
deepskyblue #00bfff
dimgray #696969
dimgrey #696969
dodgerblue #1e90ff
firebrick #b22222
floralwhite #fffaf0
forestgreen #228b22
gainsboro #dcdcdc
ghostwhite #f8f8ff
gold #ffd700
goldenrod #daa520
greenyellow #adff2f
grey #808080
honeydew #f0fff0
hotpink #ff69b4
indianred #cd5c5c
indigo #4b0082
ivory #fffff0
khaki #f0e68c
lavender #e6e6fa
lavenderblush #fff0f5
lawngreen #7cfc00
lemonchiffon #fffacd
lightblue #add8e6
lightcoral #f08080
lightcyan #e0ffff
lightgoldenrodyellow #fafad2
lightgray #d3d3d3
lightgreen #90ee90
lightgrey #d3d3d3
lightpink #ffb6c1
lightsalmon #ffa07a
lightseagreen #20b2aa
lightskyblue #87cefa
lightslategray #778899
lightslategrey #778899
lightsteelblue #b0c4de
lightyellow #ffffe0
limegreen #32cd32
linen #faf0e6
magenta
(synonym of fuchsia)
#ff00ff
mediumaquamarine #66cdaa
mediumblue #0000cd
mediumorchid #ba55d3
mediumpurple #9370db
mediumseagreen #3cb371
mediumslateblue #7b68ee
mediumspringgreen #00fa9a
mediumturquoise #48d1cc
mediumvioletred #c71585
midnightblue #191970
mintcream #f5fffa
mistyrose #ffe4e1
moccasin #ffe4b5
navajowhite #ffdead
oldlace #fdf5e6
olivedrab #6b8e23
orangered #ff4500
orchid #da70d6
palegoldenrod #eee8aa
palegreen #98fb98
paleturquoise #afeeee
palevioletred #db7093
papayawhip #ffefd5
peachpuff #ffdab9
peru #cd853f
pink #ffc0cb
plum #dda0dd
powderblue #b0e0e6
rosybrown #bc8f8f
royalblue #4169e1
saddlebrown #8b4513
salmon #fa8072
sandybrown #f4a460
seagreen #2e8b57
seashell #fff5ee
sienna #a0522d
skyblue #87ceeb
slateblue #6a5acd
slategray #708090
slategrey #708090
snow #fffafa
springgreen #00ff7f
steelblue #4682b4
tan #d2b48c
thistle #d8bfd8
tomato #ff6347
turquoise #40e0d0
violet #ee82ee
wheat #f5deb3
whitesmoke #f5f5f5
yellowgreen #9acd32
CSS Color Module Level 4 rebeccapurple #663399

transparent keyword

The transparent keyword represents a fully transparent color. This makes the background behind the colored item completely visible. Technically, transparent is a shortcut for rgba(0,0,0,0).

Compatibility note: To prevent unexpected behavior, such as in a <gradient>, the current CSS spec states that transparent should be calculated in the alpha-premultiplied color space. However, be aware that older browsers may treat it as black with an alpha value of 0.

Historical note: transparent wasn't a true color in CSS Level 2 (Revision 1). It was a special keyword that could be used instead of a regular <color> value on two CSS properties: background and border. It was essentially added to allow developers to override an inherited solid color. With the advent of alpha channels in CSS Colors Level 3, transparent was redefined as a true color. It can now be used wherever a <color> value can be used.

currentColor keyword

The currentColor keyword represents the value of an element's color property. This lets you use the color value on properties that do not receive it by default.

If currentColor is used as the value of the color property, it instead takes its value from the inherited value of the color property.

currentColor example

<div style="color:blue; border: 1px dashed currentColor;">
  The color of this text is blue.
  <div style="background:currentColor; height:9px;"></div>
  This block is surrounded by a blue border.
</div>

RGB colors

The RGB color model defines a given color according to its red, green, and blue components. An optional alpha component represents the color's transparency.

Syntax

RGB colors can be expressed through both hexadecimal (prefixed with #) and functional (rgb(), rgba()) notations.

Note: As of CSS Colors Level 4, rgba() is an alias for rgb(). In browsers that implement the Level 4 standard, they accept the same parameters and behave the same way.

Hexadecimal notation: #RRGGBB[AA]
R (red), G (green), B (blue), and A (alpha) are hexadecimal characters (0-9, A-F). A is optional. For example, #ff0000 is equivalent to #ff0000ff.
Hexadecimal notation: #RGB[A]
R (red), G (green), B (blue), and A (alpha) are hexadecimal characters (0-9, A-F). A is optional. The three-digit notation (#RGB) is a shorter version of the six-digit form (#RRGGBB). For example, #f09 is the same color as #ff0099. Likewise, the four-digit RGB notation (#RGBA) is a shorter version of the eight-digit form (#RRGGBBAA). For example, #0f38 is the same color as #00ff3388.
Functional notation: rgb(R, G, B[, A]) or rgba(R, G, B, A)
R (red), G (green), and B (blue) can be either <number>s or <percentage>s, where the number 255 corresponds to 100%. A (alpha) can be a <number> between 0 and 1, or a <percentage>, where the number 1 corresponds to 100% (full opacity).
Functional notation: rgb(R G B[ A]) or rgba(R G B A)
CSS Colors Level 4 adds support for space-separated values in the functional notation.

Examples

RGB syntax variations

This example shows the many ways in which a single color can be created with the various RGB color syntaxes.

/* These syntax variations all specify the same color: a fully opaque hot pink. */

/* Hexadecimal syntax */
#f09
#F09
#ff0099
#FF0099

/* Functional syntax */
rgb(255,0,153)
rgb(255, 0, 153)
rgb(255, 0, 153.0)
rgb(100%,0%,60%)
rgb(100%, 0%, 60%)
rgb(100%, 0, 60%) /* ERROR! Don't mix numbers and percentages. */
rgb(255 0 153)

/* Hexadecimal syntax with alpha value */
#f09f
#F09F
#ff0099ff
#FF0099FF

/* Functional syntax with alpha value */
rgb(255, 0, 153, 1)
rgb(255, 0, 153, 100%)

/* Whitespace syntax */
rgb(255 0 153 / 1)
rgb(255 0 153 / 100%)

/* Functional syntax with floats value */
rgb(255, 0, 153.6, 1)
rgb(1e2, .5e1, .5e0, +.25e2%)
RGB transparency variations
/* Hexadecimal syntax */
#3a30                    /*   0% opaque green */ 
#3A3F                    /* full opaque green */ 
#33aa3300                /*   0% opaque green */ 
#33AA3380                /* 50% opaque green */ 

/* Functional syntax */
rgba(51, 170, 51, .1)    /* 10% opaque green */ 
rgba(51, 170, 51, .4)    /* 40% opaque green */ 
rgba(51, 170, 51, .7)    /* 70% opaque green */ 
rgba(51, 170, 51,  1)    /* full opaque green */ 

/* Whitespace syntax */
rgba(51 170 51 / 0.4)    /* 40% opaque green */ 
rgba(51 170 51 / 40%)    /* 40% opaque green */ 

/* Functional syntax with floats value */
rgba(255, 0, 153.6, 1)
rgba(1e2, .5e1, .5e0, +.25e2%)

HSL colors

The HSL color model defines a given color according to its hue, saturation, and lightness components. An optional alpha component represents the color's transparency.

Many designers find HSL more intuitive than RGB, since it allows hue, saturation, and lightness to each be adjusted independently. HSL can also make it easier to create a set of matching colors (such as when you want multiple shades of a single hue).

Syntax

HSL colors are expressed through the functional hsl() and hsla() notations.

Note: As of CSS Colors Level 4, hsla() is an alias for hsl(). In browsers that implement the Level 4 standard, they accept the same parameters and behave the same way.

Functional notation: hsl(H, S, L[, A]) or hsla(H, S, L, A)
H (hue) is an <angle> of the color circle given in degs, rads, grads, or turns in CSS Color Module Level 4. When written as a unitless <number>, it is interpreted as degrees, as specified in CSS Color Module Level 3. By definition, red=0deg=360deg, with the other colors spread around the circle, so green=120deg, blue=240deg, etc. As an <angle>, it implicitly wraps around such that -120deg=240deg, 480deg=120deg, -1turn=1turn, etc.
S (saturation) and L (lightness) are percentages. 100% saturation is completely saturated, while 0% is completely unsaturated (gray). 100% lightness is white, 0% lightness is black, and 50% lightness is “normal.”
A (alpha) can be a <number> between 0 and 1, or a <percentage>, where the number 1 corresponds to 100% (full opacity).
Functional notation: hsl(H S L[ A]) or hsla(H S L A)
CSS Colors Level 4 adds support for space-separated values in the functional notation.

Examples

HSL syntax variations
/* These examples all specify the same color: a lavender. */
hsl(270,60%,70%)
hsl(270, 60%, 70%)
hsl(270 60% 70%)
hsl(270deg, 60%, 70%)
hsl(4.71239rad, 60%, 70%)
hsl(.75turn, 60%, 70%)

/* These examples all specify the same color: a lavender that is 15% opaque. */
hsl(270, 60%, 50%, .15)
hsl(270, 60%, 50%, 15%)
hsl(270 60% 50% / .15)
hsl(270 60% 50% / 15%)
Fully saturated colors
Notation Description Live
hsl(0, 100%, 50%) red
hsl(30, 100%, 50%) orange
hsl(60, 100%, 50%) yellow
hsl(90, 100%, 50%) lime green
hsl(120, 100%, 50%) green
hsl(150, 100%, 50%) blue-green
hsl(180, 100%, 50%) cyan
hsl(210, 100%, 50%) sky blue
hsl(240, 100%, 50%) blue
hsl(270, 100%, 50%) purple
hsl(300, 100%, 50%) magenta
hsl(330, 100%, 50%) pink
hsl(360, 100%, 50%) red
Lighter and darker greens
Notation Description Live
hsl(120, 100%, 0%) black
hsl(120, 100%, 20%)
hsl(120, 100%, 40%)
hsl(120, 100%, 60%)
hsl(120, 100%, 80%)
hsl(120, 100%, 100%) white
Saturated and desaturated greens
Notation Description Live
hsl(120, 100%, 50%) green
hsl(120, 80%, 50%)
hsl(120, 60%, 50%)
hsl(120, 40%, 50%)
hsl(120, 20%, 50%)
hsl(120, 0%, 50%) gray
HSL transparency variations
hsla(240, 100%, 50%, .05)     /*   5% opaque blue */ 
hsla(240, 100%, 50%, .4)      /*  40% opaque blue */ 
hsla(240, 100%, 50%, .7)      /*  70% opaque blue */ 
hsla(240, 100%, 50%, 1)       /* full opaque blue */ 

/* Whitespace syntax */
hsla(240 100% 50% / .05)      /*   5% opaque blue */ 

/* Percentage value for alpha */
hsla(240 100% 50% / 5%)       /*   5% opaque blue */ 

System Colors

Not all system colors are supported on all systems. for use on public web pages.

ActiveBorder
Active window border.
ActiveCaption
Active window caption. Should be used with CaptionText as foreground color.
AppWorkspace
Background color of multiple document interface.
Background
Desktop background.
ButtonFace
Face background color for 3-D elements that appear 3-D due to one layer of surrounding border. Should be used with the ButtonText foreground color.
ButtonHighlight
The color of the border facing the light source for 3-D elements that appear 3-D due to that layer of surrounding border.
ButtonShadow
The color of the border away from the light source for 3-D elements that appear 3-D due to that layer of surrounding border.
ButtonText
Text on push buttons. Should be used with the ButtonFace or ThreeDFace background color.
CaptionText
Text in caption, size box, and scrollbar arrow box. Should be used with the ActiveCaption background color.
GrayText
Grayed (disabled) text.
Highlight
Item(s) selected in a control. Should be used with the HighlightText foreground color.
HighlightText
Text of item(s) selected in a control. Should be used with the Highlight background color.
InactiveBorder
Inactive window border.
InactiveCaption
Inactive window caption. Should be used with the InactiveCaptionText foreground color.
InactiveCaptionText
Color of text in an inactive caption. Should be used with the InactiveCaption background color.
InfoBackground
Background color for tooltip controls. Should be used with the InfoText foreground color.
InfoText
Text color for tooltip controls. Should be used with the InfoBackground background color.
Menu
Menu background. Should be used with the MenuText or -moz-MenuBarText foreground color.
MenuText
Text in menus. Should be used with the Menu background color.
Scrollbar
Background color of scroll bars.
ThreeDDarkShadow
The color of the darker (generally outer) of the two borders away from the light source for 3-D elements that appear 3-D due to two concentric layers of surrounding border.
ThreeDFace
The face background color for 3-D elements that appear 3-D due to two concentric layers of surrounding border. Should be used with the ButtonText foreground color.
ThreeDHighlight
The color of the lighter (generally outer) of the two borders facing the light source for 3-D elements that appear 3-D due to two concentric layers of surrounding border.
ThreeDLightShadow
The color of the darker (generally inner) of the two borders facing the light source for 3-D elements that appear 3-D due to two concentric layers of surrounding border.
ThreeDShadow
The color of the lighter (generally inner) of the two borders away from the light source for 3-D elements that appear 3-D due to two concentric layers of surrounding border.
Window
Window background. Should be used with the WindowText foreground color.
WindowFrame
Window frame.
WindowText
Text in windows. Should be used with the Window background color.

Mozilla System Color Extensions

-moz-ButtonDefault
The border color that goes around buttons that represent the default action for a dialog box.
-moz-ButtonHoverFace
The background color of a button that the mouse pointer is over (which would be ThreeDFace or ButtonFace when the mouse pointer is not over it). Should be used with the -moz-ButtonHoverText foreground color.
-moz-ButtonHoverText
The text color of a button that the mouse pointer is over (which would be ButtonText when the mouse pointer is not over it). Should be used with the -moz-ButtonHoverFace background color.
-moz-CellHighlight
Background color for selected item in a tree widget. Should be used with the -moz-CellHighlightText foreground color. See also -moz-html-CellHighlight.
-moz-CellHighlightText
Text color for a selected item in a tree. Should be used with the -moz-CellHighlight background color. See also -moz-html-CellHighlightText.
-moz-Combobox
Background color for combo-boxes. Should be used with the -moz-ComboboxText foreground color. In versions prior to 1.9.2, use -moz-Field instead.
-moz-ComboboxText
Text color for combo-boxes. Should be used with the -moz-Combobox background color. In versions prior to 1.9.2, use -moz-FieldText instead.
-moz-Dialog
Background color for dialog boxes. Should be used with the -moz-DialogText foreground color.
-moz-DialogText
Text color for dialog boxes. Should be used with the -moz-Dialog background color.
-moz-dragtargetzone
-moz-EvenTreeRow
Background color for even-numbered rows in a tree. Should be used with the -moz-FieldText foreground color. In Gecko versions prior to 1.9, use -moz-Field. See also -moz-OddTreeRow.
-moz-Field
Text field background color. Should be used with the -moz-FieldText foreground color.
-moz-FieldText
Text field text color. Should be used with the -moz-Field, -moz-EvenTreeRow, or -moz-OddTreeRow background color.
-moz-html-CellHighlight
Background color for highlighted item in HTML <select>s. Should be used with the -moz-html-CellHighlightText foreground color. Prior to Gecko 1.9, use -moz-CellHighlight.
-moz-html-CellHighlightText
Text color for highlighted items in HTML <select>s. Should be used with the -moz-html-CellHighlight background color. Prior to Gecko 1.9, use -moz-CellHighlightText.
-moz-mac-accentdarkestshadow
-moz-mac-accentdarkshadow
-moz-mac-accentface
-moz-mac-accentlightesthighlight
-moz-mac-accentlightshadow
-moz-mac-accentregularhighlight
-moz-mac-accentregularshadow
-moz-mac-chrome-active
-moz-mac-chrome-inactive
-moz-mac-focusring
-moz-mac-menuselect
-moz-mac-menushadow
-moz-mac-menutextselect
-moz-MenuHover
Background color for hovered menu items. Often similar to Highlight. Should be used with the -moz-MenuHoverText or -moz-MenuBarHoverText foreground color.
-moz-MenuHoverText
Text color for hovered menu items. Often similar to HighlightText. Should be used with the -moz-MenuHover background color.
-moz-MenuBarText
Text color in menu bars. Often similar to MenuText. Should be used on top of Menu background.
-moz-MenuBarHoverText
Color for hovered text in menu bars. Often similar to -moz-MenuHoverText. Should be used on top of -moz-MenuHover background.
-moz-nativehyperlinktext
Default platform hyperlink color.
-moz-OddTreeRow
Background color for odd-numbered rows in a tree. Should be used with the -moz-FieldText foreground color. In Gecko versions prior to 1.9, use -moz-Field. See also -moz-EvenTreeRow.
-moz-win-communicationstext
Should be used for text in objects with -moz-appearance: -moz-win-communications-toolbox;.
-moz-win-mediatext
Should be used for text in objects with -moz-appearance: -moz-win-media-toolbox.
-moz-win-accentcolor

Used to access the Windows 10 custom accent color that you can set on the start menu, taskbar, title bars, etc.
-moz-win-accentcolortext

Used to access the color of text placed over the Windows 10 custom accent color in the start menu, taskbar, title bars, etc.

Mozilla Color Preference Extensions

-moz-activehyperlinktext
User's preference for text color of active links. Should be used with the default document background color.
-moz-default-background-color
User's preference for the document background color.
-moz-default-color
User's preference for the text color.
-moz-hyperlinktext
User's preference for the text color of unvisited links. Should be used with the default document background color.
-moz-visitedhyperlinktext
User's preference for the text color of visited links. Should be used with the default document background color.

Interpolation

In animations and gradients, <color> values are interpolated on each of their red, green, and blue components. Each component is interpolated as a real, floating-point number. Note that interpolation of colors happens in the alpha-premultiplied sRGBA color space to prevent unexpected gray colors from appearing. In animations, the interpolation's speed is determined by the timing function.

Accessibility considerations

Some people have difficulty distinguishing colors. The WCAG 2.0 recommendation strongly advises against using color as the only means of conveying a specific message, action, or result. See Color and color contrast for more information.

Specifications

Specification Status Comment
CSS Color Module Level 4
The definition of '<color>' in that specification.
Working Draft Adds rebeccapurple, four- (#RGBA) and eight-digit (#RRGGBBAA) hexadecimal notations, rgba() and hsla() as aliases of rgb() and hsl() (both with identical parameter syntax), space-separated function parameters as an alternative to commas, percentages for alpha values, and angles for the hue component in hsl() colors.
CSS Color Module Level 3
The definition of '<color>' in that specification.
Recommendation Deprecates system colors. Adds SVG colors and rgba(), hsl(), and hsla() functional notations.
CSS Level 2 (Revision 1)
The definition of '<color>' in that specification.
Recommendation Adds the orange keyword and system colors.
CSS Level 1
The definition of '<color>' in that specification.
Recommendation Initial definition. Includes 16 basic color keywords.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
colorChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3Opera Full support YesSafari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support YesSafari iOS Full support 1Samsung Internet Android Full support 1.0
Keyword color valuesChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3
Notes
Full support 3
Notes
Notes Internet Explorer 8 and later support gray color keywords spelled with an e (grey, darkgrey, darkslategrey, dimgrey, lightgrey, and lightslategrey). Internet Explorer 3 to Internet Explorer 7 only support the keywords spelled with a (gray, darkgray, darkslategray, dimgray, lightgray, and lightslategray).
Opera Full support 3.5Safari Full support 1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
RGB hexadecimal notation (#RRGGBB, #RGB)Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3Opera Full support 3.5Safari Full support 1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
RGB functional notation (rgb())Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 3.5Safari Full support 1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
HSL color values (hsl())Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 9Opera Full support 9.5Safari Full support 3.1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
Alpha color values (rgba(), hsla())Chrome Full support 1Edge Full support 12Firefox Full support 3IE Full support 9Opera Full support 10Safari Full support 3.1WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
currentcolorChrome Full support 1Edge Full support 12Firefox Full support 1.5IE Full support 9Opera Full support 9.5Safari Full support 4WebView Android Full support 37Chrome Android Full support 18Firefox Android Full support 4Opera Android ? Safari iOS ? Samsung Internet Android ?
transparentChrome Full support 1Edge Full support 12Firefox Full support 3IE Full support 9Opera Full support 10Safari Full support 3.1WebView Android Full support 37Chrome Android Full support 18Firefox Android Full support 4Opera Android ? Safari iOS ? Samsung Internet Android ?
rebeccapurpleChrome Full support 38Edge Full support 12Firefox Full support 33IE Full support 11Opera Full support 25Safari Full support 9WebView Android Full support 38Chrome Android Full support 38Firefox Android Full support 33Opera Android Full support 25Safari iOS Full support 8Samsung Internet Android Full support 3.0
RGBA hexadecimal notation (#RRGGBBAA, #RGBA)Chrome Full support 62
Full support 62
Full support 52
Disabled
Disabled From version 52: this feature is behind the Enable experimental Web Platform features preference. To change preferences in Chrome, visit chrome://flags.
Edge No support NoFirefox Full support 49IE No support NoOpera Full support 39
Disabled
Full support 39
Disabled
Disabled From version 39: this feature is behind the Enable experimental Web Platform features preference.
Safari Full support 9.1WebView Android Full support 62
Full support 62
Full support 52
Disabled
Disabled From version 52: this feature is behind the Enable experimental Web Platform features preference.
Chrome Android Full support 62
Full support 62
Full support 52
Disabled
Disabled From version 52: this feature is behind the Enable experimental Web Platform features preference. To change preferences in Chrome, visit chrome://flags.
Firefox Android Full support 49Opera Android No support NoSafari iOS ? Samsung Internet Android ?
Space-separated functional color notationsChrome Full support 65Edge No support NoFirefox Full support 52IE No support NoOpera Full support 52Safari Full support 12.1WebView Android Full support 65Chrome Android Full support 65Firefox Android Full support 52Opera Android Full support 47Safari iOS Full support 12.2Samsung Internet Android ?
Allow floats in rgb() and rgba()Chrome Full support 66Edge No support NoFirefox Full support 52IE No support NoOpera Full support 53Safari Full support 12.1WebView Android Full support 66Chrome Android Full support 66Firefox Android Full support 52Opera Android Full support 47Safari iOS Full support 12.2Samsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also