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  1. Web 开发技术
  2. CSS（层叠样式表）
  3. CSS 生成内容

此页面由社区从英文翻译而来。了解更多并加入 MDN Web Docs 社区。

In this article

  • 参考
  • 规范
  • 浏览器兼容性

Related Topics

  1. CSS
  2. 教程
  3. CSS 基础
  4. CSS 第一步
    1. CSS 第一步概述
    2. 什么是 CSS?
    3. CSS 入门
    4. CSS 的结构是怎样的
    5. CSS 是如何工作的
    6. 测验：为传记页面添加样式
  5. CSS 构建
    1. CSS 构建基础概述
    2. 级联与继承
    3. CSS 选择器
    4. 盒子模型
    5. 背景和边框
    6. 处理不同方向的文本
    7. 溢出
    8. CSS 值和单位
    9. 在 CSS 中调整大小
    10. 图像、媒体和表单元素
    11. 样式化表格
    12. 调试 CSS
    13. 组织你的 CSS
    14. 测验：基本的 CSS 理解
    15. 测验：创建精美的信纸
    16. 测验：一个漂亮的盒子
  6. 样式化文本
    1. 样式化文本概述
    2. 基础文本与字体样式化
    3. 样式化列表
    4. 样式化链接
    5. Web 字体
    6. 测验：排版社区大学首页
  7. CSS 布局概述
    1. CSS 布局概述
    2. Introduction to CSS layout
    3. 一般的流布局
    4. Flex 布局
    5. 网格
    6. 浮动
    7. 定位
    8. 多栏式布局
    9. 响应式布局
    10. 媒体查询入门指南
    11. 传统的布局方法
    12. 支持旧版浏览器
    13. 测验：对布局基础知识的理解
  8. 参考
  9. Modules
    1. Compositing and Blending (en-US)
    2. CSS Animations
    3. CSS Backgrounds and Borders
    4. CSS Basic User Interface
    5. CSS Box Alignment
    6. CSS Box Model
    7. CSS Charsets (en-US)
    8. CSS Colors
    9. CSS Multi-column Layout
    10. CSS Conditional Rules
    11. CSS Containment
    12. CSS Counter Styles
    13. CSS Display (en-US)
    14. CSS Flexible Box Layout
    15. CSS Fonts
    16. CSS Fragmentation
    17. CSS Generated Content
    18. CSS Grid Layout
    19. CSS Images (en-US)
    20. CSS Lists (en-US)
    21. CSS Logical Properties and Values
    22. CSS Masking
    23. CSS Miscellaneous (en-US)
    24. CSS Motion Path (en-US)
    25. CSS Namespaces (en-US)
    26. CSS Overflow (en-US)
    27. CSS Paged Media (en-US)
    28. CSS Positioned Layout
    29. CSS Ruby Layout (en-US)
    30. CSS Scroll Snap
    31. CSS Scroll Snap Points (en-US)
    32. CSS Scrollbars
    33. CSS Shapes
    34. CSS Table
    35. CSS Text
    36. CSS Text Decoration
    37. CSS Transforms
    38. CSS Transitions
    39. CSS Custom Properties for Cascading Variables (en-US)
    40. CSS Writing Modes
    41. CSSOM View
    42. Filter Effects (en-US)
    43. Media queries
    44. Paged media
  10. Properties
    1. -webkit-*
      1. -webkit-line-clamp
      2. -webkit-text-fill-color (en-US)
      3. -webkit-text-stroke
      4. -webkit-text-stroke-color (en-US)
      5. -webkit-text-stroke-width (en-US)
    2. accent-color (en-US)
    3. align-*
      1. align-content
      2. align-items
      3. align-self
      4. 实验性 align-tracks (en-US)
    4. all
    5. animation-*
      1. animation
      2. 实验性 animation-composition (en-US)
      3. animation-delay
      4. animation-direction
      5. animation-duration
      6. animation-fill-mode
      7. animation-iteration-count
      8. animation-name
      9. animation-play-state
      10. 实验性 animation-timeline (en-US)
      11. animation-timing-function
    6. appearance
    7. aspect-ratio
    8. backdrop-filter
    9. backface-visibility
    10. background-*
      1. background
      2. background-attachment
      3. background-blend-mode
      4. background-clip
      5. background-color
      6. background-image
      7. background-origin
      8. background-position
      9. background-position-x
      10. background-position-y
      11. background-repeat
      12. background-size
    11. block-size
    12. border-*
      1. border
      2. border-block
      3. border-block-color (en-US)
      4. border-block-end
      5. border-block-end-color (en-US)
      6. border-block-end-style (en-US)
      7. border-block-end-width (en-US)
      8. border-block-start (en-US)
      9. border-block-start-color (en-US)
      10. border-block-start-style (en-US)
      11. border-block-start-width (en-US)
      12. border-block-style (en-US)
      13. border-block-width (en-US)
      14. border-bottom
      15. border-bottom-color
      16. border-bottom-left-radius
      17. border-bottom-right-radius
      18. border-bottom-style
      19. border-bottom-width
      20. border-collapse
      21. border-color
      22. border-end-end-radius (en-US)
      23. border-end-start-radius (en-US)
      24. border-image
      25. border-image-outset
      26. border-image-repeat
      27. border-image-slice
      28. border-image-source
      29. border-image-width
      30. border-inline (en-US)
      31. border-inline-color
      32. border-inline-end (en-US)
      33. border-inline-end-color (en-US)
      34. border-inline-end-style (en-US)
      35. border-inline-end-width (en-US)
      36. border-inline-start (en-US)
      37. border-inline-start-color (en-US)
      38. border-inline-start-style (en-US)
      39. border-inline-start-width (en-US)
      40. border-inline-style (en-US)
      41. border-inline-width (en-US)
      42. border-left
      43. border-left-color
      44. border-left-style
      45. border-left-width
      46. border-radius
      47. border-right
      48. border-right-color
      49. border-right-style
      50. border-right-width
      51. border-spacing
      52. border-start-end-radius (en-US)
      53. border-start-start-radius (en-US)
      54. border-style
      55. border-top
      56. border-top-color
      57. border-top-left-radius
      58. border-top-right-radius
      59. border-top-style
      60. border-top-width
      61. border-width
    13. bottom
    14. box-*
      1. box-decoration-break
      2. box-shadow
      3. box-sizing
    15. break-*
      1. break-after
      2. break-before
      3. break-inside
    16. caption-side
    17. caret-color
    18. clear
    19. 已弃用 clip
    20. clip-path
    21. color
    22. color-scheme
    23. column-*
      1. column-count
      2. column-fill
      3. column-gap
      4. column-rule
      5. column-rule-color
      6. column-rule-style
      7. column-rule-width
      8. column-span
      9. column-width (en-US)
    24. columns
    25. contain-*
      1. contain
      2. contain-intrinsic-block-size (en-US)
      3. contain-intrinsic-height (en-US)
      4. contain-intrinsic-inline-size (en-US)
      5. contain-intrinsic-size (en-US)
      6. contain-intrinsic-width (en-US)
    26. container-*
      1. container (en-US)
      2. container-name (en-US)
      3. container-type (en-US)
    27. content
    28. content-visibility (en-US)
    29. counter-*
      1. counter-increment
      2. counter-reset
      3. counter-set (en-US)
    30. cursor
    31. direction
    32. display
    33. empty-cells
    34. filter
    35. flex-*
      1. flex
      2. flex-basis
      3. flex-direction
      4. flex-flow
      5. flex-grow
      6. flex-shrink
      7. flex-wrap
    36. float
    37. font-*
      1. font
      2. font-family
      3. font-feature-settings
      4. font-kerning
      5. font-language-override
      6. font-optical-sizing (en-US)
      7. font-size
      8. font-size-adjust
      9. font-stretch
      10. font-style
      11. font-synthesis
      12. font-variant
      13. font-variant-alternates
      14. font-variant-caps
      15. font-variant-east-asian (en-US)
      16. font-variant-ligatures
      17. font-variant-numeric
      18. font-variant-position
      19. font-variation-settings
      20. font-weight
    38. forced-color-adjust (en-US)
    39. gap
    40. grid-*
      1. grid
      2. grid-area
      3. grid-auto-columns
      4. grid-auto-flow
      5. grid-auto-rows
      6. grid-column
      7. grid-column-end (en-US)
      8. grid-column-start (en-US)
      9. grid-row
      10. grid-row-end (en-US)
      11. grid-row-start (en-US)
      12. grid-template
      13. grid-template-areas
      14. grid-template-columns
      15. grid-template-rows
    41. hanging-punctuation
    42. height
    43. hyphenate-character (en-US)
    44. hyphens
    45. image-*
      1. image-orientation
      2. image-rendering
      3. 实验性 image-resolution (en-US)
    46. 已弃用 ime-mode (en-US)
    47. 实验性 initial-letter (en-US)
    48. 实验性 initial-letter-align (en-US)
    49. inline-size
    50. inset-*
      1. inset (en-US)
      2. inset-block (en-US)
      3. inset-block-end (en-US)
      4. inset-block-start (en-US)
      5. inset-inline (en-US)
      6. inset-inline-end (en-US)
      7. inset-inline-start (en-US)
    51. isolation
    52. justify-*
      1. justify-content
      2. justify-items
      3. justify-self
      4. 实验性 justify-tracks (en-US)
    53. left
    54. letter-spacing
    55. line-*
      1. line-break
      2. line-height
      3. 实验性 line-height-step (en-US)
    56. list-*
      1. list-style
      2. list-style-image
      3. list-style-position
      4. list-style-type
    57. margin-*
      1. margin
      2. margin-block
      3. margin-block-end (en-US)
      4. margin-block-start
      5. margin-bottom
      6. margin-inline (en-US)
      7. margin-inline-end (en-US)
      8. margin-inline-start (en-US)
      9. margin-left
      10. margin-right
      11. margin-top
      12. 实验性 margin-trim (en-US)
    58. mask-*
      1. mask
      2. mask-border
      3. mask-border-mode
      4. mask-border-outset (en-US)
      5. mask-border-repeat
      6. mask-border-slice
      7. mask-border-source (en-US)
      8. mask-border-width
      9. mask-clip (en-US)
      10. mask-composite (en-US)
      11. mask-image
      12. mask-mode
      13. mask-origin (en-US)
      14. mask-position (en-US)
      15. mask-repeat
      16. mask-size (en-US)
      17. mask-type (en-US)
    59. 实验性 masonry-auto-flow (en-US)
    60. math-*
      1. 实验性 math-depth (en-US)
      2. 实验性 math-shift (en-US)
      3. 实验性 math-style (en-US)
    61. max-*
      1. max-block-size (en-US)
      2. max-height
      3. max-inline-size (en-US)
      4. max-width
    62. min-*
      1. min-block-size (en-US)
      2. min-height
      3. min-inline-size (en-US)
      4. min-width
    63. mix-blend-mode
    64. object-fit
    65. object-position
    66. offset-*
      1. offset
      2. offset-anchor (en-US)
      3. offset-distance (en-US)
      4. offset-path (en-US)
      5. 实验性 offset-position (en-US)
      6. offset-rotate (en-US)
    67. opacity
    68. order
    69. orphans (en-US)
    70. outline-*
      1. outline
      2. outline-color
      3. outline-offset
      4. outline-style
      5. outline-width
    71. overflow-*
      1. overflow
      2. overflow-anchor
      3. overflow-block
      4. overflow-clip-margin (en-US)
      5. overflow-inline (en-US)
      6. overflow-wrap
      7. overflow-x
      8. overflow-y
    72. overscroll-*
      1. overscroll-behavior
      2. overscroll-behavior-block (en-US)
      3. overscroll-behavior-inline (en-US)
      4. overscroll-behavior-x
      5. overscroll-behavior-y
    73. padding-*
      1. padding
      2. padding-block (en-US)
      3. padding-block-end (en-US)
      4. padding-block-start (en-US)
      5. padding-bottom
      6. padding-inline (en-US)
      7. padding-inline-end (en-US)
      8. padding-inline-start
      9. padding-left
      10. padding-right
      11. padding-top
    74. page-*
      1. page-break-after
      2. page-break-before (en-US)
      3. page-break-inside
    75. paint-order
    76. perspective
    77. perspective-origin
    78. place-*
      1. place-content
      2. place-items
      3. place-self (en-US)
    79. pointer-events
    80. position
    81. print-color-adjust (en-US)
    82. quotes
    83. resize
    84. right
    85. rotate
    86. row-gap
    87. 实验性 ruby-align (en-US)
    88. ruby-position (en-US)
    89. scale
    90. scroll-*
      1. scroll-behavior
      2. scroll-margin
      3. scroll-margin-block (en-US)
      4. scroll-margin-block-end (en-US)
      5. scroll-margin-block-start (en-US)
      6. scroll-margin-bottom (en-US)
      7. scroll-margin-inline (en-US)
      8. scroll-margin-inline-end (en-US)
      9. scroll-margin-inline-start (en-US)
      10. scroll-margin-left (en-US)
      11. scroll-margin-right (en-US)
      12. scroll-margin-top
      13. scroll-padding (en-US)
      14. scroll-padding-block (en-US)
      15. scroll-padding-block-end (en-US)
      16. scroll-padding-block-start (en-US)
      17. scroll-padding-bottom (en-US)
      18. scroll-padding-inline (en-US)
      19. scroll-padding-inline-end (en-US)
      20. scroll-padding-inline-start (en-US)
      21. scroll-padding-left (en-US)
      22. scroll-padding-right (en-US)
      23. scroll-padding-top (en-US)
      24. scroll-snap-align (en-US)
      25. scroll-snap-stop (en-US)
      26. scroll-snap-type
      27. 实验性 scroll-timeline (en-US)
      28. 实验性 scroll-timeline-axis (en-US)
      29. 实验性 scroll-timeline-name (en-US)
    91. scrollbar-*
      1. scrollbar-color
      2. scrollbar-gutter (en-US)
      3. scrollbar-width
    92. shape-*
      1. shape-image-threshold
      2. shape-margin
      3. shape-outside
    93. tab-size
    94. table-layout
    95. text-*
      1. text-align
      2. text-align-last
      3. text-combine-upright (en-US)
      4. text-decoration
      5. text-decoration-color
      6. text-decoration-line
      7. 实验性 text-decoration-skip
      8. text-decoration-skip-ink (en-US)
      9. text-decoration-style
      10. text-decoration-thickness
      11. text-emphasis (en-US)
      12. text-emphasis-color (en-US)
      13. text-emphasis-position (en-US)
      14. text-emphasis-style (en-US)
      15. text-indent
      16. text-justify
      17. text-orientation
      18. text-overflow
      19. text-rendering
      20. text-shadow
      21. 实验性 text-size-adjust
      22. text-transform
      23. text-underline-offset
      24. text-underline-position
    96. top
    97. touch-action
    98. transform-*
      1. transform
      2. transform-box
      3. transform-origin
      4. transform-style
    99. transition-*
      1. transition
      2. transition-delay
      3. transition-duration
      4. transition-property
      5. transition-timing-function
    100. translate
    101. unicode-bidi
    102. user-select
    103. vertical-align
    104. visibility
    105. white-space
    106. widows
    107. width
    108. will-change
    109. word-break
    110. word-spacing
    111. writing-mode
    112. z-index
  11. Selectors
    1. Attribute selectors
    2. Class selectors
    3. ID selectors
    4. Type selectors
    5. Universal selectors
  12. Combinators
    1. Adjacent sibling combinator
    2. Child combinator
    3. 实验性 Column combinator
    4. Descendant combinator
    5. General sibling combinator
    6. Selector list
  13. Pseudo-classes
    1. :active
    2. :any-link
    3. :autofill (en-US)
    4. 实验性 :blank
    5. :checked
    6. :default
    7. :defined
    8. :dir()
    9. :disabled
    10. :empty
    11. :enabled
    12. :first
    13. :first-child
    14. :first-of-type
    15. :focus
    16. :focus-visible
    17. :focus-within
    18. :fullscreen
    19. :future (en-US)
    20. :has()
    21. :host
    22. :host-context()
    23. :host()
    24. :hover
    25. :in-range
    26. :indeterminate
    27. :invalid
    28. :is()
    29. :lang()
    30. :last-child
    31. :last-of-type
    32. :left
    33. :link
    34. :local-link (en-US)
    35. :modal (en-US)
    36. :not()
    37. :nth-child()
    38. :nth-col (en-US)
    39. :nth-last-child()
    40. :nth-last-col (en-US)
    41. :nth-last-of-type()
    42. :nth-of-type()
    43. :only-child
    44. :only-of-type
    45. :optional
    46. :out-of-range
    47. :past (en-US)
    48. :paused (en-US)
    49. :picture-in-picture
    50. :placeholder-shown
    51. :playing (en-US)
    52. :read-only
    53. :read-write
    54. :required
    55. :right
    56. :root
    57. :scope
    58. :target
    59. :target-within (en-US)
    60. 实验性 :user-invalid (:-moz-ui-invalid) (en-US)
    61. 实验性 :user-valid (:-moz-ui-valid) (en-US)
    62. :valid
    63. :visited
    64. :where()
  14. Pseudo-elements
    1. ::after
    2. ::backdrop
    3. ::before
    4. ::cue
    5. ::cue-region (en-US)
    6. ::file-selector-button
    7. ::first-letter
    8. ::first-line
    9. 实验性 ::grammar-error
    10. ::marker
    11. ::part()
    12. ::placeholder
    13. ::selection
    14. ::slotted()
    15. 实验性 ::spelling-error
    16. 实验性 ::target-text (en-US)
  15. At-rules
    1. @charset
    2. @color-profile (en-US)
    3. @container (en-US)
    4. @counter-style
    5. @font-face
    6. @font-feature-values
    7. @import
    8. @keyframes
    9. @layer
    10. @media
    11. @namespace
    12. @page
    13. 实验性 @property
    14. @supports
  16. Functions
    1. 实验性 abs() (en-US)
    2. acos() (en-US)
    3. asin() (en-US)
    4. atan() (en-US)
    5. atan2() (en-US)
    6. attr()
    7. calc()
    8. clamp()
    9. cos() (en-US)
    10. counter()
    11. counters()
    12. cross-fade() (en-US)
    13. 实验性 element()
    14. env()
    15. 实验性 exp() (en-US)
    16. fit-content()
    17. 实验性 hypot() (en-US)
    18. 实验性 log() (en-US)
    19. max()
    20. min()
    21. minmax()
    22. path() (en-US)
    23. 实验性 pow() (en-US)
    24. repeat()
    25. 实验性 round() (en-US)
    26. 实验性 sign() (en-US)
    27. sin() (en-US)
    28. 实验性 sqrt() (en-US)
    29. symbols() (en-US)
    30. tan() (en-US)
    31. url()
    32. var()
  17. Types
    1. <alpha-value> (en-US)
    2. <angle>
    3. <angle-percentage>
    4. <basic-shape>
    5. <blend-mode>
    6. <calc-constant> (en-US)
    7. <calc-sum> (en-US)
    8. <color>
    9. <custom-ident>
    10. <dimension>
    11. <display-box>
    12. <display-inside> (en-US)
    13. <display-internal>
    14. <display-legacy>
    15. <display-listitem> (en-US)
    16. <display-outside>
    17. <easing-function>
    18. <filter-function>
    19. <flex>
    20. <frequency>
    21. <frequency-percentage> (en-US)
    22. <gradient>
    23. <hex-color> (en-US)
    24. <ident> (en-US)
    25. <image>
    26. <integer>
    27. <length>
    28. <length-percentage>
    29. <named-color> (en-US)
    30. <number>
    31. <percentage>
    32. <position>
    33. <ratio>
    34. <resolution>
    35. 已弃用 <shape> (en-US)
    36. <string>
    37. <system-color> (en-US)
    38. <time>
    39. <time-percentage>
    40. <transform-function>
    41. <translation-value> (en-US)
  18. 指南
  19. 动画
    1. 运用 CSS 动画
  20. 背景和边框
    1. 多个背景的应用
    2. 重设背景图片的大小
  21. 盒子的对齐方式
    1. 块布局中的对齐方式 (en-US)
    2. Flex 布局中的对齐方式
    3. Grid 布局中的盒模型对齐 (en-US)
    4. 多栏式布局中的对齐方式 (en-US)
  22. 盒子模型
    1. 盒子模型基础简介
    2. 外边距重叠
  23. 列
    1. 多列布局的基础概念
    2. 多列布局的样式 (en-US)
    3. 多列布局中的跨越与平衡 (en-US)
    4. 处理多列布局的溢出
    5. 多列布局中的内容换行 (en-US)
  24. 条件规则
    1. 运用查询特性
  25. CSS 对象模型视图
    1. 坐标系
  26. Flex 布局
    1. Flex 布局基础
    2. 与其他布局的比较
    3. Flex 容器中的对齐方式
    4. Flex 布局中的排序方式
    5. 控制 Flex 子元素在主轴上的比例
    6. 包装 Flex 布局中的元素
    7. 经典的 Flex 布局示例
    8. Flex 布局的向下兼容性
  27. 流布局
    1. 一般的流布局中的块和内联布局
    2. 应用或脱离流布局
    3. 格式化上下文简介
    4. 流布局和书写模式
    5. 流布局和溢出
  28. 字体
    1. OpenType 字体特性指南
    2. 可变字体
  29. Grid 布局
    1. Grid 布局基础概念
    2. 和其他布局方法的联系
    3. 基于网格线的定位
    4. Grid 模板区域
    5. 使用命名线布局
    6. Grid 布局中的自动定位
    7. Grid 布局中的盒模型对齐
    8. 网格、逻辑值和书写模式
    9. Grid 布局和无障碍
    10. Grid 布局和渐进增强
    11. 运用 Grid 布局实现常见布局
    12. 子网格 (en-US)
    13. Masonry 布局 (en-US)
  30. 图片
    1. 使用 CSS 渐变
  31. 列表和计数器
    1. 运用 CSS 计数器
    2. 调整列表缩进
  32. 逻辑属性
    1. 基础概念
    2. 浮动和定位
    3. Margins, borders and padding (en-US)
    4. 调整尺寸 (en-US)
  33. 媒体查询
    1. 运用媒体查询
    2. 无障碍相关的媒体查询 (en-US)
    3. 运用编程方法测试媒体查询
  34. 定位
    1. CSS z-index
  35. Scroll snap
    1. scroll snap 基础概念 (en-US)
    2. scroll snap 和浏览器兼容性 (en-US)
  36. 形状
    1. 形状概述
    2. 使用 box 值指定形状
    3. 基础的形状 (en-US)
    4. 从图片中指定形状 (en-US)
  37. 文本
    1. 包装文本和文本断行 (en-US)
  38. 变换
    1. 运用变换
  39. 过渡
    1. 运用过渡
  40. 布局的 cookbook
    1. 媒体对象
    2. 列
    3. 居中一个元素
    4. 固定的页脚 (en-US)
    5. 分块导航
    6. 面包屑导航
    7. 带有图标的列表 (en-US)
    8. 分页 (en-US)
    9. 卡片
    10. Grid 布局包装器 (en-US)
  42. 工具
    1. 取色器
    2. Box shadow 生成器
    3. 图片边框生成器

In this article

  • 参考
  • 规范
  • 浏览器兼容性

CSS 生成内容

CSS Generated Content 是 CSS 其中一个模块，定义了如何给一个元素添加内容

参考

属性

  • content
  • quotes

规范

Specification
CSS Generated Content Module Level 3

浏览器兼容性

{{Compat}}

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Last modified: 2022年9月21日, by MDN contributors

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