:root

La pseudo-class CSS :root coincideix amb l'element arrel de l'arbre que representa el document. En HTML, :root representa l'element <html> i és idèntic al selector html, excepte que la seva Especificitat és més alta.

/*  Selecciona l'element arrel del document: <html> en el cas de l'HTML */
:root {
  background: yellow;
}

Sintaxi

:root

Exemple

El ùs de :root pot ser útil per declarar Variables CSS globals:

:root {
  --main-color: hotpink;
  --pane-padding: 5px 42px;
}

Especificacions

Especificació Estat Comentari
Selectors Level 4
The definition of ':root' in that specification.		 Working Draft Sense canvis.
Selectors Level 3
The definition of ':root' in that specification.		 Recommendation Definició inicial.

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Descripció Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Suport bàsic 1 (Yes) 1.0 (1.7 or earlier) 9 9.5 1.0
Descripció Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Suport bàsic ? (Yes) ? ? ? ?
Related Topics
  1. CSS
  2. CSS Reference
  3. CSS Selectors
  4. Guides
    1. Ùs de la pseudo-class :target en selectors
  5. Basic Selectors
    1. Selector Type
    2. Selector Class
    3. Selector ID
    4. Selector Universal
    5. Selector Atribut
  6. Combinators
    1. Combinador de germans adjacents
    2. Combinador general de germans
    3. Combinador de fills
    4. Selectors de descendents
    5. Column combinator [Traduir]
  7. Pseudo-classes
    1. :active
    2. :any-link
    3. :checked
    4. :blank [Traduir]
    5. :default
    6. :defined [Traduir]
    7. :dir()
    8. :disabled
    9. :empty
    10. :enabled
    11. :first
    12. :first-child
    13. :first-of-type
    14. :fullscreen
    15. :focus
    16. :focus-within
    17. :has() [Traduir]
    18. :host() [Traduir]
    19. :host-context() [Traduir]
    20. :hover
    21. :indeterminate
    22. :in-range
    23. :invalid
    24. :is() (:matches(), :any()) [Traduir]
    25. :lang
    26. :last-child
    27. :last-of-type
    28. :left
    29. :link
    30. :not()
    31. :nth-child
    32. :nth-last-child
    33. :nth-last-of-type
    34. :nth-of-type
    35. :only-child
    36. :only-of-type
    37. :optional
    38. :out-of-range
    39. :placeholder-shown
    40. :read-only
    41. :read-write
    42. :required
    43. :right
    44. :root
    45. :scope
    46. :target
    47. :valid
    48. :visited
    49. :where() [Traduir]
  8. Pseudo-elements
    1. ::-moz-progress-bar
    2. ::-moz-range-progress
    3. ::-moz-range-thumb
    4. ::-moz-range-track
    5. ::-ms-browse [Traduir]
    6. ::-ms-check [Traduir]
    7. ::-ms-clear [Traduir]
    8. ::-ms-expand [Traduir]
    9. ::-ms-fill
    10. ::-ms-fill-lower
    11. ::-ms-fill-upper
    12. ::-ms-reveal [Traduir]
    13. ::-ms-thumb
    14. ::-ms-ticks-after [Traduir]
    15. ::-ms-ticks-before [Traduir]
    16. ::-ms-tooltip [Traduir]
    17. ::-ms-track
    18. ::-ms-value [Traduir]
    19. ::-webkit-progress-bar
    20. ::-webkit-progress-value
    21. ::-webkit-slider-runnable-track
    22. ::-webkit-slider-thumb
    23. ::after (:after)
    24. ::backdrop
    25. ::before (:before)
    26. ::cue (:cue)
    27. ::first-letter (:first-letter)
    28. ::first-line (:first-line)
    29. ::grammar-error [Traduir]
    30. ::placeholder
    31. ::selection
    32. ::slotted() [Traduir]
    33. ::spelling-error [Traduir]