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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
Summary
The border-block-start-color
CSS property defines the color of the logical block start border of an element, which maps to a physical border color depending on the element's writing mode, directionality, and text orientation. It corresponds to the border-top-color
, border-right-color
, border-bottom-color
, or border-left-color
property depending on the values defined for writing-mode
, direction
, and text-orientation
.
It relates to border-block-end-color
, border-inline-start-color
, and border-inline-end-color
, which define the other border colors of the element.
Initial value | currentcolor |
---|---|
Applies to | all elements |
Inherited | no |
Media | visual |
Computed value | computed color |
Animation type | discrete |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
Syntax
border-block-start-color: blue; border-block-start-color: #4c5d21;
Values
<'border-color'>
- See
border-color
Formal syntax
<'color'>where
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where
<rgb()> = rgb( <rgb-component>#{3} )
<rgba()> = rgba( <rgb-component>#{3} , <alpha-value> )
<hsl()> = hsl( <hue>, <percentage>, <percentage> )
<hsla()> = hsla( <hue>, <percentage>, <percentage>, <alpha-value> )
<named-color> = <ident>
<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 | WindowTextwhere
<rgb-component> = <integer> | <percentage>
<alpha-value> = <number>
<hue> = <number>
Example
HTML Content
<div> <p class="exampleText">Example text</p> </div>
CSS Content
div { background-color: yellow; width: 120px; height: 120px; } .exampleText { writing-mode: vertical-lr; border: 10px solid blue; border-block-start-color: red; }
Specification
Specification | Status | Comment |
---|---|---|
CSS Logical Properties Level 1 The definition of 'border-block-start-color' in that specification. |
Editor's Draft | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | No support | 41.0 (41.0)[1] | No support | No support | No support |
Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support | No support | 41.0 (41.0)[1] | No support | No support | No support |
[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled
, disabled by default. The preference has been removed in Gecko 51 and this property cannot be disabled since this version.
See also
- The mapped physical properties:
border-top-color
,border-right-color
,border-bottom-color
, andborder-left-color
writing-mode
,direction
,text-orientation