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outline-color
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
outline-color CSS 属性 被用于设置一个元素轮廓的颜色。
尝试一下
outline-color: red;outline-color: #32a1ce;outline-color: rgba(170, 50, 220, 0.6);outline-color: hsla(60, 90%, 50%, 0.8);outline-color: currentcolor;<section> <div> This is a box with an outline around it. </div></section>#example-element { outline: 0.75em solid; padding: 0.75em; width: 80%; height: 100px;}大多时候使用outline而不是outline-style,outline-width 和outline-color会更方便。
元素轮廓是绘制于元素周围的一条线，位于border的外围，使元素突出。不像 border，轮廓在元素的 frame 外绘制并且可能与其他元素重叠。而 border 不会出现这种现象 (除非故意).
语法
/* <color> values */outline-color: #f92525;outline-color: rgb(30, 222, 121);outline-color: blue;/* Keyword value */outline-color: invert;/* Global values */outline-color: inherit;outline-color: initial;outline-color: unset;outline-color可用以下这些值。
值
形式语法
outline-color =
auto|
<'border-top-color'>
<border-top-color> =
<color>|
<image-1D>
<image-1D> =
<stripes()>
<stripes()> =
stripes(<color-stripe>#)
<color-stripe> =
<color>&&
[<length-percentage>|<flex>]?
<length-percentage> =
<length>|
<percentage>
示例
HTML
<p>My outline is blue, as you can see.</p>CSS
p { outline: 2px solid; /* Set the outline width and style */ outline-color: #0000ff; /* Make the outline blue */ margin: 5px;}Accessibility concerns
Customfocus styles commonly involve making adjustments to theoutline property. If the color of the outline is adjusted, it is important to ensure that the contrast ratio between it and the background the outline is placed over is high enough that people experiencing low vision conditions will be able to perceive it.
Color contrast ratio is determined by comparing the luminosity of the text and background color values. In order to meet currentWeb Content Accessibility Guidelines (WCAG), a ratio of 4.5:1 is required for text content and 3:1 for larger text such as headings. Large text is defined as 18.66px andbold or larger, or 24px or larger.
规范
| Specification |
|---|
| CSS Basic User Interface Module Level 4 # outline-color |