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    outline-width

    Summary

    The outline-width CSS property is used to set the width of the outline of an element. An outline is a line that is drawn around elements, outside the border edge, to make the element stand out:

    Syntax

    Formal syntax: <br-width>
    
    outline-width: thin
    outline-width: medium
    outline-width: thick
    
    outline-width: 1px     /* <length> values */
    outline-width: 0.1em
    
    outline-width: inherit
    </length>

    Values

    thin
    Depends on the UA. Typically 1px in desktop browsers like Firefox.
    medium
    Depends on the UA. Typically 3px in desktop browsers like Firefox.
    thick
    Depends on the UA. Typically 5px in desktop browsers like Firefox.
    <length>
    See <length> values.

    Examples

    thin   medium    thick    2px    1ex      2em

    Specifications

    Specification Status Comment
    CSS Basic User Interface Module Level 3
    The definition of 'outline-width' in that specification.
    Working Draft No change.
    CSS Transitions
    The definition of 'outline-width' in that specification.
    Working Draft Defines outline-width as animatable.
    CSS Level 2 (Revision 1)
    The definition of 'outline-width' in that specification.
    Recommendation  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support  1.0 1.5 (1.8) [*] 8.0 7.0 1.2 (125)
    Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
    Basic support ? ? ? ? ?

    In browsers previous to Gecko 1.8 (Firefox 1.5) essentially the same effect can be achieved using Mozilla CSS Extension -moz-outline-width.

    See also

    Document Tags and Contributors

    Last updated by: Cust0dian,