导航
×
   ❮   
HTML CSS JavaScript PHP Go Sass W3C Colors ECMS

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 @property 规则


实例

为渐变指定两个自定义属性 - 并使用它们来制作渐变动画

@property --startColor {
  syntax: "<color>";
  initial-value: #EADEDB;
  inherits: false;
}

@property --endColor {
  syntax: "<color>";
  initial-value: #BC70A4;
  inherits: false;
}
亲自试一试 »

更多“自己尝试”的例子见下文。


定义和用法

@property 规则用于直接在样式表中定义自定义 CSS 属性,无需运行任何 JavaScript。

@property 规则具有数据类型检查和约束,设置默认值,并定义属性是否可以继承值。

使用 @property 的好处

  • 类型检查和约束:必须指定自定义属性的数据类型,例如<number>、<color>、<length> 等。这可以防止错误并确保自定义属性被正确使用。
  • 设置默认值:为自定义属性设置默认值。这样可以确保如果稍后分配无效值,浏览器将使用定义的备用值。
  • 设置继承行为:必须指定自定义属性是否可以从其父元素继承值。

定义自定义属性的实例

@property --my-color {
  syntax: "<color>";
  inherits: true;
  initial-value: lightgray;
}

上面的定义表明 --my-color 是一个颜色属性,它可以从父元素继承值,其默认值为 lightgray。

在 CSS 中使用自定义属性

body {
  backgound-color: var(--my-color);
}

浏览器支持

表格中的数字表示完全支持该规则的第一个浏览器版本。

属性
@property 85 85 128 16.4 71

CSS 语法

@property --propertyname {
 
syntax: "<color>";
  initial-value: red;
  inherits: false;
}

属性值

描述
--propertyname 必需。自定义属性的名称。
syntax
initial-value
inherits
syntax 的合法值:可以是<length>、<number>、<percentage>、<length-percentage>、<color>、<image>、<url>、<integer>、<angle>、<time>、<resolution>、<transform-function> 或<custom-ident>,或数据类型和关键字值列表。

+(空格分隔)和 #(逗号分隔)乘数表示期望值列表,例如<color># 表示期望的语法是<color> 值的一个逗号分隔列表。

垂直线 (|) 可以创建期望语法的“或”条件,例如<length> | auto 接受<length> 或 auto,而<color># |<integer># 则期望<color> 值或<integer> 值的逗号分隔列表。

initial-value 的合法值:设置属性的初始值。

inherits 的合法值: True 或 false。控制 @property 指定的自定义属性是否默认继承。


更多实例

实例

指定两个自定义属性:一个用于项目大小,一个用于项目颜色

@property --item-size {
  syntax: "<percentage>";
  inherits: true;
  initial-value: 50%;
}

@property --item-color {
  syntax: "<color>";
  inherits: false;
  initial-value: lightgray;
}
亲自试一试 »

Copyright ©2020-2026 freew3c.com All Rights Reserved 提供的内容仅用于学习和测试,不保证内容的正确性。