:required

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La pseudo-class CSS :required representa qulasevol element <input>, <select> o <textarea> que té l'atribut required establert en ell.

/* Selecciona qualsevol <input> requerit */
input:required {
  border: 1px dashed red;
}

Aquesta pseudo-class és útil per ressaltar els camps que han de tenir dades vàlides abans de poder enviar un formulari.

Nota: La classe pseudo-class :optional selecciona camps de formulari opcionals.

Sintaxi

:required

Exemples

Veure :invalid com exemple.

Especificacions

Especificació Estat Comentari
HTML Living Standard
The definition of ':required' in that specification.		 Living Standard Sense canvis.
HTML5
The definition of ':required' in that specification.		 Recommendation Defineix la semàntica respecte a HTML i la validació de restriccions.
Selectors Level 4
The definition of ':required' in that specification.		 Working Draft Sense canvis.
CSS Basic User Interface Module Level 3
The definition of ':required' in that specification.		 Recommendation Defineix la pseudo-classe, però no la semàntica associada.

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Descripció Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Suport bàsic 10.0 (Yes) 4.0 (2) 10 10.0 5.0
Descripció Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Suport bàsic 4.4.4 (Yes) 4.0 (2) No support 10.0 5.0

Vegeu també

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]