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  1. Web technology for developers
  2. CSS: Cascading Style Sheets
  3. CSS Namespaces
  • Change language

Table of contents

  • Reference
  • Specifications
  • Browser compatibility

CSS Namespaces

CSS Namespaces is a CSS module that allows authors to specify XML namespaces in CSS.

Reference

At-rules

  • @namespace

Specifications

Specification Status Comment
CSS Namespaces Module Recommendation Initial definition

Browser compatibility

@namespace rule

BCD tables only load in the browser

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Last modified: Aug 12, 2021, by MDN contributors

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Related Topics

  1. Learn CSS
  2. CSS first steps
    1. CSS first steps overview
    2. What is CSS?
    3. Getting started with CSS
    4. How CSS is structured
    5. How CSS works
    6. Using your new knowledge
  3. CSS building blocks
    1. CSS building blocks overview
    2. Cascade and inheritance
    3. CSS selectors
    4. The box model
    5. Backgrounds and borders
    6. Handling different text directions
    7. Overflowing content
    8. Values and units
    9. Sizing items in CSS
    10. Images, media, and form elements
    11. Styling tables
    12. Debugging CSS
    13. Organizing your CSS
  4. Styling text
    1. Styling text overview
    2. Fundamental text and font styling
    3. Styling lists
    4. Styling links
    5. Web fonts
    6. Assessment: Typesetting a community school homepage
  5. CSS layout
    1. CSS layout overview
    2. Introduction to CSS layout
    3. Normal Flow
    4. Flexbox
    5. Grids
    6. Floats
    7. Positioning
    8. Multiple-column Layout
    9. Responsive design
    10. Beginner's guide to media queries
    11. Legacy Layout Methods
    12. Supporting Older Browsers
    13. Fundamental Layout Comprehension
  6. Reference
  7. Modules
    1. Compositing and Blending
    2. CSS Animations
    3. CSS Backgrounds and Borders
    4. CSS Basic User Interface
    5. CSS Box Model
    6. CSS Charsets
    7. CSS Color
    8. CSS Multi-column Layout
    9. CSS Conditional Rules
    10. CSS Counter Styles
    11. CSS Device Adaptation
    12. CSS Display
    13. CSS Flexible Box Layout
    14. CSS Fonts
    15. CSS Fragmentation
    16. CSS Generated Content
    17. CSS Grid Layout
    18. CSS Houdini
    19. CSS Images
    20. CSS Lists
    21. CSS Logical Properties and Values
    22. CSS Masking
    23. CSS Miscellaneous
    24. CSS Motion Path
    25. CSS Namespaces
    26. CSS Paged Media
    27. CSS Positioned Layout
    28. CSS Ruby Layout
    29. CSS Scroll Snap Points
    30. CSS Scroll Snap
    31. CSS Scrollbars
    32. CSS selectors
    33. CSS Shapes
    34. CSS Table
    35. CSS Text Decoration
    36. CSS Text
    37. CSS Transforms
    38. CSS Transitions
    39. CSS data types
    40. CSS Custom Properties for Cascading Variables
    41. CSS Writing Modes
    42. CSSOM View
    43. Filter Effects
    44. Media queries
    45. Pseudo-classes
    46. Pseudo-elements
    47. CSS reference
  8. Properties
    1. accent-color
    2. align-content
    3. align-items
    4. align-self
    5. all
    6. animation-delay
    7. animation-direction
    8. animation-duration
    9. animation-fill-mode
    10. animation-iteration-count
    11. animation-name
    12. animation-play-state
    13. animation-timing-function
    14. animation
    15. appearance (-moz-appearance, -webkit-appearance)
    16. aspect-ratio
    17. backdrop-filter
    18. backface-visibility
    19. background-attachment
    20. background-blend-mode
    21. background-clip
    22. background-color
    23. background-image
    24. background-origin
    25. background-position-x
    26. background-position-y
    27. background-position
    28. background-repeat
    29. background-size
    30. background
    31. block-size
    32. border-block-color
    33. border-block-end-color
    34. border-block-end-style
    35. border-block-end-width
    36. border-block-end
    37. border-block-start-color
    38. border-block-start-style
    39. border-block-start-width
    40. border-block-start
    41. border-block-width
    42. border-bottom-color
    43. border-bottom-left-radius
    44. border-bottom-right-radius
    45. border-bottom-style
    46. border-bottom-width
    47. border-bottom
    48. border-collapse
    49. border-color
    50. border-end-end-radius
    51. border-end-start-radius
    52. border-image-outset
    53. border-image-repeat
    54. border-image-slice
    55. border-image-source
    56. border-image-width
    57. border-image
    58. border-inline-color
    59. border-inline-end-color
    60. border-inline-end-style
    61. border-inline-end-width
    62. border-inline-end
    63. border-inline-start-color
    64. border-inline-start-style
    65. border-inline-start-width
    66. border-inline-start
    67. border-inline-style
    68. border-inline-width
    69. border-inline
    70. border-left-color
    71. border-left-style
    72. border-left-width
    73. border-left
    74. border-radius
    75. border-right-color
    76. border-right-style
    77. border-right-width
    78. border-right
    79. border-spacing
    80. border-start-end-radius
    81. border-start-start-radius
    82. border-style
    83. border-top-color
    84. border-top-left-radius
    85. border-top-right-radius
    86. border-top-style
    87. border-top-width
    88. border-top
    89. border-width
    90. bottom
    91. box-decoration-break
    92. box-shadow
    93. box-sizing
    94. break-after
    95. break-before
    96. break-inside
    97. caption-side
    98. caret-color
    99. clear
    100. clip-path
    101. clip
    102. color-scheme
    103. color
    104. column-count
    105. column-fill
    106. column-gap (grid-column-gap)
    107. column-rule-color
    108. column-rule-style
    109. column-rule-width
    110. column-rule
    111. column-span
    112. column-width
    113. columns
    114. contain
    115. content-visibility
    116. content
    117. counter-increment
    118. counter-reset
    119. counter-set
    120. cursor
    121. direction
    122. display
    123. empty-cells
    124. filter
    125. flex-basis
    126. flex-direction
    127. flex-flow
    128. flex-grow
    129. flex-shrink
    130. flex-wrap
    131. flex
    132. float
    133. font-family
    134. font-feature-settings
    135. font-kerning
    136. font-language-override
    137. font-optical-sizing
    138. font-size-adjust
    139. font-size
    140. font-stretch
    141. font-style
    142. font-synthesis
    143. font-variant-alternates
    144. font-variant-caps
    145. font-variant-east-asian
    146. font-variant-ligatures
    147. font-variant-numeric
    148. font-variant-position
    149. font-variant
    150. font-variation-settings
    151. font-weight
    152. font
    153. forced-color-adjust
    154. gap (grid-gap)
    155. grid-area
    156. grid-auto-columns
    157. grid-auto-flow
    158. grid-auto-rows
    159. grid-column-end
    160. grid-column-start
    161. grid-column
    162. grid-row-end
    163. grid-row-start
    164. grid-row
    165. grid-template-areas
    166. grid-template-columns
    167. grid-template-rows
    168. grid-template
    169. grid
    170. hanging-punctuation
    171. height
    172. hyphenate-character
    173. hyphens
    174. image-orientation
    175. image-rendering
    176. image-resolution
    177. ime-mode
    178. initial-letter-align
    179. initial-letter
    180. inline-size
    181. inset-block-end
    182. inset-block-start
    183. inset-block
    184. inset-inline-end
    185. inset-inline-start
    186. inset-inline
    187. inset
    188. isolation
    189. justify-content
    190. justify-items
    191. justify-self
    192. left
    193. letter-spacing
    194. line-break
    195. line-height-step
    196. line-height
    197. list-style-image
    198. list-style-position
    199. list-style-type
    200. list-style
    201. margin-block-end
    202. margin-block-start
    203. margin-block
    204. margin-bottom
    205. margin-inline-end
    206. margin-inline-start
    207. margin-inline
    208. margin-left
    209. margin-right
    210. margin-top
    211. margin-trim
    212. margin
    213. mask-border-mode
    214. mask-border-outset
    215. mask-border-repeat
    216. mask-border-slice
    217. mask-border-source
    218. mask-border-width
    219. mask-border
    220. mask-clip
    221. mask-composite
    222. mask-image
    223. mask-mode
    224. mask-origin
    225. mask-position
    226. mask-repeat
    227. mask-size
    228. mask-type
    229. mask
    230. max-block-size
    231. max-height
    232. max-inline-size
    233. max-width
    234. min-block-size
    235. min-height
    236. min-inline-size
    237. min-width
    238. mix-blend-mode
    239. object-fit
    240. object-position
    241. offset-distance
    242. offset-position
    243. offset-rotate
    244. offset
    245. opacity
    246. order
    247. orphans
    248. outline-color
    249. outline-offset
    250. outline-style
    251. outline-width
    252. outline
    253. overflow-anchor
    254. overflow-block
    255. overflow-clip-margin
    256. overflow-inline
    257. overflow-wrap
    258. overflow-x
    259. overflow-y
    260. overflow
    261. overscroll-behavior-block
    262. overscroll-behavior-inline
    263. overscroll-behavior-x
    264. overscroll-behavior-y
    265. overscroll-behavior
    266. padding-block-end
    267. padding-block-start
    268. padding-bottom
    269. padding-inline-end
    270. padding-inline-start
    271. padding-left
    272. padding-right
    273. padding-top
    274. padding
    275. page-break-after
    276. page-break-before
    277. page-break-inside
    278. perspective-origin
    279. perspective
    280. place-content
    281. place-items
    282. place-self
    283. pointer-events
    284. position
    285. quotes
    286. resize
    287. right
    288. rotate
    289. row-gap (grid-row-gap)
    290. ruby-align
    291. ruby-position
    292. scale
    293. scroll-behavior
    294. scroll-margin-bottom
    295. scroll-margin-inline-start
    296. scroll-margin-inline
    297. scroll-margin-left
    298. scroll-margin-right
    299. scroll-margin-top
    300. scroll-padding-block-end
    301. scroll-padding-block-start
    302. scroll-padding-bottom
    303. scroll-padding-inline-end
    304. scroll-padding-inline-start
    305. scroll-padding-inline
    306. scroll-padding-left
    307. scroll-padding
    308. scroll-snap-coordinate
    309. scroll-snap-destination
    310. scroll-snap-points-x
    311. scroll-snap-points-y
    312. scroll-snap-type
    313. scrollbar-color
    314. scrollbar-width
    315. shape-image-threshold
    316. shape-margin
    317. shape-outside
    318. tab-size
    319. table-layout
    320. text-align-last
    321. text-align
    322. text-combine-upright
    323. text-decoration-color
    324. text-decoration-line
    325. text-decoration-skip-ink
    326. text-decoration-skip
    327. text-decoration-style
    328. text-decoration
    329. text-emphasis-color
    330. text-emphasis-position
    331. text-emphasis-style
    332. text-emphasis
    333. text-indent
    334. text-justify
    335. text-orientation
    336. text-overflow
    337. text-rendering
    338. text-shadow
    339. text-size-adjust
    340. text-transform
    341. text-underline-position
    342. top
    343. touch-action
    344. transform-box
    345. transform-origin
    346. transform-style
    347. transform
    348. transition-delay
    349. transition-duration
    350. transition-property
    351. transition-timing-function
    352. transition
    353. translate
    354. unicode-bidi
    355. user-select
    356. vertical-align
    357. visibility
    358. white-space
    359. widows
    360. width
    361. will-change
    362. word-break
    363. word-spacing
    364. writing-mode
    365. z-index
  9. Selectors
    1. Adjacent sibling combinator
    2. Attribute selectors
    3. Child combinator
    4. Class selectors
    5. Column combinator
    6. Descendant combinator
    7. General sibling combinator
    8. ID selectors
    9. Selector list
    10. Type selectors
    11. Universal selectors
  10. Pseudo-classes
    1. :active
    2. :any-link
    3. :autofill
    4. :blank
    5. :checked
    6. :default
    7. :defined
    8. :dir()
    9. :disabled
    10. :empty
    11. :enabled
    12. :first-child
    13. :first-of-type
    14. :first
    15. :focus-visible
    16. :focus-within
    17. :focus
    18. :fullscreen
    19. :has()
    20. :host-context()
    21. :host()
    22. :host
    23. :hover
    24. :in-range
    25. :indeterminate
    26. :invalid
    27. :is() (:matches(), :any())
    28. :lang()
    29. :last-child
    30. :last-of-type
    31. :left
    32. :link
    33. :not()
    34. :nth-child()
    35. :nth-last-child()
    36. :nth-last-of-type()
    37. :nth-of-type()
    38. :only-child
    39. :only-of-type
    40. :optional
    41. :out-of-range
    42. :paused
    43. :picture-in-picture
    44. :placeholder-shown
    45. :playing
    46. :read-only
    47. :read-write
    48. :required
    49. :right
    50. :root
    51. :scope
    52. :target
    53. :user-invalid (:-moz-ui-invalid)
    54. :user-valid (:-moz-ui-valid)
    55. :valid
    56. :visited
    57. :where()
    58. Privacy and the :visited selector
    59. Pseudo-classes
  11. Pseudo-elements
    1. ::after (:after)
    2. ::backdrop
    3. ::before (:before)
    4. ::cue-region
    5. ::cue
    6. ::first-letter (:first-letter)
    7. ::first-line (:first-line)
    8. ::grammar-error
    9. ::marker
    10. ::part()
    11. ::placeholder
    12. ::selection
    13. ::slotted()
    14. ::spelling-error
    15. ::target-text
    16. Pseudo-elements
  12. At-rules
    1. @charset
    2. @color-profile
    3. @counter-style
    4. @document
    5. @font-face
    6. @font-feature-values
    7. @import
    8. @keyframes
    9. @layer
    10. @media
    11. @namespace
    12. @page
    13. @property
    14. @supports
    15. @viewport
  13. Types
    1. <alpha-value>
    2. <angle-percentage>
    3. <angle>
    4. <basic-shape>
    5. <blend-mode>
    6. <color>
    7. CSS Functional Notation
    8. CSS data types
    9. <custom-ident>
    10. <dimension>
    11. <display-box>
    12. <display-inside>
    13. <display-internal>
    14. <display-legacy>
    15. <display-listitem>
    16. <display-outside>
    17. <easing-function>
    18. <filter-function>
    19. <flex>
    20. <frequency-percentage>
    21. <frequency>
    22. <gradient>
    23. ident
    24. <image>
    25. <integer>
    26. <length-percentage>
    27. <length>
    28. <number>
    29. <percentage>
    30. <position>
    31. <ratio>
    32. <resolution>
    33. <shape>
    34. <string>
    35. <time-percentage>
    36. <time>
    37. <transform-function>
    38. <translation-value>
  14. Guides
  15. Animations
    1. Using CSS animations
  16. Backgrounds and Borders
    1. Using multiple backgrounds
    2. Resizing background images
  17. Box alignment
    1. Box alignment in block layout
    2. Box alignment in flexbox
    3. Box alignment in grid layout
    4. Box alignment in multi-column layout
  18. Box model
    1. Introduction to the CSS basic box model
    2. Mastering margin collapsing
  19. Columns
    1. Basic concepts of Multicol
    2. Styling columns
    3. Spanning and balancing
    4. Handling overflow in Multicol
    5. Content breaks in Multicol
  20. Conditional rules
    1. Using feature queries
  21. CSSOM view
    1. Coordinate systems
  22. Flexbox
    1. Basic concepts of Flexbox
    2. Comparison with other layout methods
    3. Aligning items in a flex container
    4. Ordering flex items
    5. Controlling flex item ratios
    6. Mastering wrapping of flex items
    7. Typical use cases of Flexbox
    8. Backwards compatibility of Flexbox
  23. Flow layout
    1. Block and Inline layout in normal flow
    2. In flow and Out of flow
    3. Formatting contexts explained
    4. Flow layout and writing modes
    5. Flow layout and overflow
  24. Fonts
    1. OpenType font features guide
    2. Variable fonts guide
  25. Grid
    1. Basics concepts of grid layout
    2. Relationship to other layout methods
    3. Line-based placement
    4. Grid template areas
    5. Layout using named grid lines
    6. Auto-placement in grid layout
    7. Box alignment in grid layout
    8. Grids, logical values and writing modes
    9. Grid layout and accessibility
    10. Grid Layout and progressive enhancement
    11. Realizing common layouts using grids
    12. Subgrid
    13. Masonry layout
  26. Images
    1. Using CSS gradients
  27. Lists and counters
    1. Using CSS counters
    2. Consistent list indentation
  28. Logical properties
    1. Basic concepts
    2. Floating and positioning
    3. Margins, borders and padding
    4. Sizing
  29. Media queries
    1. Using media queries
    2. Using media queries for accessibility
    3. Testing media queries programmatically
  30. Positioning
    1. Understanding CSS z-index
  31. Scroll snap
    1. Basic concepts of scroll snap
    2. Browser compatibility and scroll snap
  32. Shapes
    1. Overview of shapes
    2. Shapes from box values
    3. Basic shapes
    4. Shapes from images
  33. Text
    1. Wrapping and breaking text
  34. Transforms
    1. Using transforms
  35. Transitions
    1. Using transitions
  36. Layout cookbook
    1. Media objects
    2. Columns
    3. Center an element
    4. Sticky footers
    5. Split navigation
    6. Breadcrumb navigation
    7. List group with badges
    8. Pagination
    9. Card
    10. Grid wrapper
  38. Tools
    1. Color picker
    2. Box shadow generator
    3. Border image generator
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