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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: Dec 18, 2020, 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. hyphens
    173. image-orientation
    174. image-rendering
    175. image-resolution
    176. ime-mode
    177. initial-letter-align
    178. initial-letter
    179. inline-size
    180. inset-block-end
    181. inset-block-start
    182. inset-block
    183. inset-inline-end
    184. inset-inline-start
    185. inset-inline
    186. inset
    187. isolation
    188. justify-content
    189. justify-items
    190. justify-self
    191. left
    192. letter-spacing
    193. line-break
    194. line-height-step
    195. line-height
    196. list-style-image
    197. list-style-position
    198. list-style-type
    199. list-style
    200. margin-block-end
    201. margin-block-start
    202. margin-block
    203. margin-bottom
    204. margin-inline-end
    205. margin-inline-start
    206. margin-inline
    207. margin-left
    208. margin-right
    209. margin-top
    210. margin-trim
    211. margin
    212. mask-border-mode
    213. mask-border-outset
    214. mask-border-repeat
    215. mask-border-slice
    216. mask-border-source
    217. mask-border-width
    218. mask-border
    219. mask-clip
    220. mask-composite
    221. mask-image
    222. mask-mode
    223. mask-origin
    224. mask-position
    225. mask-repeat
    226. mask-size
    227. mask-type
    228. mask
    229. max-block-size
    230. max-height
    231. max-inline-size
    232. max-width
    233. min-block-size
    234. min-height
    235. min-inline-size
    236. min-width
    237. mix-blend-mode
    238. object-fit
    239. object-position
    240. offset-distance
    241. offset-position
    242. offset-rotate
    243. offset
    244. opacity
    245. order
    246. orphans
    247. outline-color
    248. outline-offset
    249. outline-style
    250. outline-width
    251. outline
    252. overflow-anchor
    253. overflow-block
    254. overflow-clip-margin
    255. overflow-inline
    256. overflow-wrap
    257. overflow-x
    258. overflow-y
    259. overflow
    260. overscroll-behavior-block
    261. overscroll-behavior-inline
    262. overscroll-behavior-x
    263. overscroll-behavior-y
    264. overscroll-behavior
    265. padding-block-end
    266. padding-block-start
    267. padding-bottom
    268. padding-inline-end
    269. padding-inline-start
    270. padding-left
    271. padding-right
    272. padding-top
    273. padding
    274. page-break-after
    275. page-break-before
    276. page-break-inside
    277. perspective-origin
    278. perspective
    279. place-content
    280. place-items
    281. place-self
    282. pointer-events
    283. position
    284. quotes
    285. resize
    286. right
    287. rotate
    288. row-gap (grid-row-gap)
    289. ruby-align
    290. ruby-position
    291. scale
    292. scroll-behavior
    293. scroll-margin-bottom
    294. scroll-margin-inline-start
    295. scroll-margin-inline
    296. scroll-margin-left
    297. scroll-margin-right
    298. scroll-margin-top
    299. scroll-padding-block-end
    300. scroll-padding-block-start
    301. scroll-padding-bottom
    302. scroll-padding-inline-end
    303. scroll-padding-inline-start
    304. scroll-padding-inline
    305. scroll-padding-left
    306. scroll-padding
    307. scroll-snap-coordinate
    308. scroll-snap-destination
    309. scroll-snap-points-x
    310. scroll-snap-points-y
    311. scroll-snap-type
    312. scrollbar-color
    313. scrollbar-width
    314. shape-image-threshold
    315. shape-margin
    316. shape-outside
    317. tab-size
    318. table-layout
    319. text-align-last
    320. text-align
    321. text-combine-upright
    322. text-decoration-color
    323. text-decoration-line
    324. text-decoration-skip-ink
    325. text-decoration-skip
    326. text-decoration-style
    327. text-decoration
    328. text-emphasis-color
    329. text-emphasis-position
    330. text-emphasis-style
    331. text-emphasis
    332. text-indent
    333. text-justify
    334. text-orientation
    335. text-overflow
    336. text-rendering
    337. text-shadow
    338. text-size-adjust
    339. text-transform
    340. text-underline-position
    341. top
    342. touch-action
    343. transform-box
    344. transform-origin
    345. transform-style
    346. transform
    347. transition-delay
    348. transition-duration
    349. transition-property
    350. transition-timing-function
    351. transition
    352. translate
    353. unicode-bidi
    354. user-select
    355. vertical-align
    356. visibility
    357. white-space
    358. widows
    359. width
    360. will-change
    361. word-break
    362. word-spacing
    363. writing-mode
    364. 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. :state()
    53. :target
    54. :user-invalid (:-moz-ui-invalid)
    55. :user-valid (:-moz-ui-valid)
    56. :valid
    57. :visited
    58. :where()
    59. Privacy and the :visited selector
    60. 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. @media
    10. @namespace
    11. @page
    12. @property
    13. @supports
    14. @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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