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CSS 参考手册

CSS 浏览器支持 CSS 选择器 CSS 伪元素 CSS 组合符 CSS 函数 CSS 参考 (听觉) CSS 网页安全字体 CSS 字体回退 CSS 可动画属性 CSS PX 到 EM 转换器 CSS 颜色 CSS 颜色值 CSS 默认值 CSS 实体

CSS 属性

accent-color 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 aspect-ratio backdrop-filter backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-position-x background-position-y background-repeat background-size block-size border border-block border-block-color border-block-end border-block-end-color border-block-end-style border-block-end-width border-block-start border-block-start-color border-block-start-style border-block-start-width border-block-style border-block-width border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-end-end-radius border-end-start-radius border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-inline border-inline-color border-inline-end border-inline-end-color border-inline-end-style border-inline-end-width border-inline-start border-inline-start-color border-inline-start-style border-inline-start-width border-inline-style border-inline-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-start-end-radius border-start-start-radius 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-reflect box-shadow box-sizing break-after break-before break-inside caption-side caret-color @charset clear clip clip-path color color-scheme 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 counter-set 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 gap grid grid-area grid-auto-columns grid-auto-flow grid-auto-rows grid-column grid-column-end grid-column-start grid-row grid-row-end grid-row-start grid-template grid-template-areas grid-template-columns grid-template-rows hanging-punctuation height hyphens hyphenate-character image-rendering @import initial-letter inline-size inset inset-block inset-block-end inset-block-start inset-inline inset-inline-end inset-inline-start isolation justify-content justify-items justify-self @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-block margin-block-end margin-block-start margin-bottom margin-inline margin-inline-end margin-inline-start margin-left margin-right margin-top marker marker-end marker-mid marker-start mask mask-clip mask-composite mask-image mask-mode mask-origin mask-position mask-repeat mask-size mask-type max-height max-width @media max-block-size max-inline-size min-block-size min-inline-size min-height min-width mix-blend-mode object-fit object-position offset offset-anchor offset-distance offset-path offset-position offset-rotate opacity order orphans outline outline-color outline-offset outline-style outline-width overflow overflow-anchor overflow-wrap overflow-x overflow-y overscroll-behavior overscroll-behavior-block overscroll-behavior-inline overscroll-behavior-x overscroll-behavior-y padding padding-block padding-block-end padding-block-start padding-bottom padding-inline padding-inline-end padding-inline-start padding-left padding-right padding-top page-break-after page-break-before page-break-inside paint-order perspective perspective-origin place-content place-items place-self pointer-events position @property quotes resize right rotate row-gap scale scroll-behavior scroll-margin scroll-margin-block scroll-margin-block-end scroll-margin-block-start scroll-margin-bottom scroll-margin-inline scroll-margin-inline-end scroll-margin-inline-start scroll-margin-left scroll-margin-right scroll-margin-top scroll-padding scroll-padding-block scroll-padding-block-end scroll-padding-block-start scroll-padding-bottom scroll-padding-inline scroll-padding-inline-end scroll-padding-inline-start scroll-padding-left scroll-padding-right scroll-padding-top scroll-snap-align scroll-snap-type scrollbar-color scroll-snap-stop tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-decoration-thickness text-emphasis text-emphasis-color text-emphasis-position text-emphasis-style text-indent text-justify text-orientation text-overflow text-shadow text-transform text-underline-offset text-underline-position top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function translate unicode-bidi user-select vertical-align visibility white-space widows width word-break word-spacing word-wrap writing-mode z-index zoom

CSS position 属性


实例

定位一个<h2> 元素

h2 {
  position: absolute;
  left: 100px;
  top: 150px;
}
亲自试一试 »

更多“自己尝试”的例子见下文。


定义和用法

The position property specifies the type of positioning method used for an element (static, relative, absolute, fixed, or sticky).

默认值 static
继承 no
可动画 否。 阅读关于可动画属性
版本 CSS2
JavaScript 语法 object.style.position="absolute" 尝试一下

浏览器支持

表中的数字指定了完全支持该属性的第一个浏览器版本。

属性
position 1.0 7.0 1.0 1.0 4.0

注意: sticky 值在 Edge 15 及更早版本中不受支持。


CSS 语法

position: static|absolute|fixed|relative|sticky|initial|inherit;

属性值

描述 演示
static 默认值。元素按照它们在文档流中的顺序进行渲染
absolute 元素相对于其第一个定位(非 static)的祖先元素进行定位
fixed 元素相对于浏览器窗口进行定位
relative 元素相对于其正常位置进行定位,因此 "left:20px" 会在元素的左侧位置增加 20 像素
sticky 元素根据用户的滚动位置进行定位

粘性元素在 relativefixed 之间切换,具体取决于滚动位置。它相对于视口中的给定偏移位置进行定位,直到达到该位置 - 然后它“粘住”在原地(就像 position:fixed)。

注意: IE/Edge 15 或更早版本不支持。Safari 从 6.1 版本开始支持,带有 -webkit- 前缀。
试一试 »
initial 将此属性设置为其默认值。阅读关于initial
inherit 从其父元素继承此属性。阅读关于inherit

更多实例

实例

如何相对于其正常位置定位元素

h2.pos_left {
  position: relative;
  left: -20px;
}

h2.pos_right {
  position: relative;
  left: 20px;
}
亲自试一试 »

实例

更多定位

#parent1 {
  position: static;
  border: 1px solid blue;
  width: 300px;
  height: 100px;
}

#child1 {
  position: absolute;
  border: 1px solid red;
  top: 70px;
  right: 15px;
}

#parent2 {
  position: relative;
  border: 1px solid blue;
  width: 300px;
  height: 100px;
}

#child2 {
  position: absolute;
  border: 1px solid red;
  top: 70px;
  right: 15px;
}
亲自试一试 »

相关页面

CSS 教程:CSS 定位

HTML DOM 参考:position 属性


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