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    :required

    Summary

    The :required CSS pseudo-class represents any <input> element that has the required attribute set on it. This allows forms to easily indicate which fields must have valid data before the form can be submitted.

    The :optional pseudo-class may be used to provide an appearance for optional form fields.

    Examples

    See :invalid for an example.

    Specifications

    Specification Status Comment
    WHATWG HTML Living Standard
    The definition of ':required' in that specification.
    Living Standard No change.
    HTML5
    The definition of ':required' in that specification.
    Recommendation Defines the semantic regarding HTML and constraint validation.
    Selectors Level 4
    The definition of ':required' in that specification.
    Working Draft No change.
    CSS Basic User Interface Module Level 3
    The definition of ':required' in that specification.
    Working Draft Defines the pseudo-class, but not the associated semantic.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 10.0 4.0 (2) 10 10.0 5.0
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support ? 4.0 (2) Not supported 10.0 5.0

    See also

    Document Tags and Contributors

    Contributors to this page: Sheppy, MusikAnimal, teoli, nimbupani, kscarfone, FredB, McGurk
    Last updated by: MusikAnimal,