CSS 参考手册

CSS 参考手册 CSS 浏览器支持 CSS 选择器 CSS 函数 CSS 听觉 CSS Web 安全字体 CSS 动画相关属性 CSS 单位 CSS PX-EM 转换 CSS 颜色 CSS 颜色值 CSS 默认值 CSS 实体

CSS 属性

align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-decoration-break box-shadow box-sizing break-after break-before break-inside caption-side caret-color @charset clear clip clip-path color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-feature-settings font-kerning font-size font-size-adjust font-stretch font-style font-variant font-variant-caps font-weight grid grid-area grid-auto-columns grid-auto-flow grid-auto-rows grid-column grid-column-end grid-column-gap grid-column-start grid-gap grid-row grid-row-end grid-row-gap grid-row-start grid-template grid-template-areas grid-template-columns grid-template-rows hanging-punctuation height hyphens @import isolation justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width @media min-height min-width mix-blend-mode object-fit object-position opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin pointer-events position quotes resize right scroll-behavior tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi user-select vertical-align visibility white-space width word-break word-spacing word-wrap writing-mode z-index



CSS outline 属性


实例

围绕 h2 元素和 div 元素设置轮廓:

h2 {
  outline: 5px dotted green;
}

div.a {
  outline: 2px dashed blue;
}
亲自试一试 »

定义和用法

(轮廓)是绘制于元素周围的一条线,位于边框边缘的外围,可起到突出元素的作用。

outline 是以下属性的简写属性:

如果省略了轮廓颜色,则应用的颜色将是文本的颜色。

注释: 轮廓与 borders 边框不同! 与边框不同,轮廓绘制在元素边框之外,并且可能与其他内容重叠。此外,轮廓不是元素尺寸的一部分;元素的总宽度和高度不受轮廓宽度的影响。

默认值: medium invert color
继承性: no
支持动画: yes, 请参阅单独的属性. 阅读有关动画的信息 测试一下
版本: CSS2
JavaScript 语法: object.style.outline="#0000FF dotted 5px" 测试一下

浏览器支持

表中的数字表示支持该属性的第一个浏览器版本。

属性
outline 1.0 8.0 1.5 1.2 7.0


语法

outline: outline-width outline-style outline-color|initial|inherit;

属性值

描述
outline-width 规定边框的宽度。
outline-style 规定边框的样式。
outline-color 规定边框的颜色。
initial 将此属性设置为其默认值。请参阅 initial
inherit 从其父元素继承此属性。请参阅 inherit

相关页面

CSS 教程: CSS Outline

HTML DOM 参考手册: outline 属性