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    width

    Summary

    The width CSS property specifies the width of the content area of an element. The content area is inside the padding, border, and margin of the element.

    The min-width and max-width properties override width.

    • Initial value auto
    • Applies to all elements but non-replaced inline elements, table rows, and row groups
    • Inherited no
    • Percentages refer to the width of the containing block
    • Media visual
    • Computed value the percentage or auto as specified or the absolute length
    • Animatable yes, as a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a calc() function that is the sum of a length and a percentage (each possibly zero), and these calc() functions have each half interpolated as real numbers.
    • Canonical order the length or percentage before the keyword, if both are present

    Syntax

    /* <length> values */
    width: 300px;
    width: 25em;
    
    /* <percentage> value */
    width: 75%;
    
    /* Keyword values */
    width: border-box;
    width: content-box;
    width: max-content;
    width: min-content;
    width: available;
    width: fit-content;
    width: auto;
    
    width: inherit;
    

    Values

    <length>
    See <length> for possible units.
    <percentage>
    Specified as a <percentage> of containing block's width.
    border-box
    If present, the preceding <length> or <percentage> is applied to the element's border box.
    content-box
    If present, the preceding <length> or <percentage> is applied to the element's content box.
    auto
    The browser will calculate and select a width for the specified element.
    max-content
    The intrinsic preferred width.
    min-content
    The intrinsic minimum width.
    available
    The containing block width minus horizontal margin, border and padding.
    Note: WebKit implements a variation of this value, under the name fill-available as of December 2013.
    fit-content
    The larger of:
    • the intrinsic minimum width
    • the smaller of the intrinsic preferred width and the available width
    Note: WebKit implements an earlier version of this value, under the name intrinsic, but as of June 2012, implements fit-content as well.

    Formal syntax

    Formal syntax: [<length> | <percentage>] && [border-box | content-box]? | available | min-content | max-content | fit-content | auto

    Examples

    Default width

    p.goldie { background: gold }
    <p class="goldie">The Mozilla community produces a lot of great software.</p>

    Pixels and ems

    .px_length {
      width: 200px;
      background-color: red;
      color: white;
      border: 1px solid black;
    }
    .em_length {
      width: 20em;
      background-color: white;
      color: red;
      border: 1px solid black;
    }
    
    <div class="px_length">Width measured in px</div>
    <div class="em_length">Width measured in em</div>

    Percentage

    .percent {
    	width: 20%;
    	background-color: silver;
    	border: 1px solid red;
    }
    <div class="percent">Width in percentage</div>

    max-content


    p.maxgreen {
      background: lightgreen;
      width: intrinsic;           /* Safari/WebKit uses a non-standard name */
      width: -moz-max-content;    /* Firefox/Gecko */
      width: -webkit-max-content; /* Chrome */
    }
    <p class="maxgreen">The Mozilla community produces a lot of great software.</p>

    min-content

    p.minblue {
      background: lightblue;
      width: -moz-min-content;    /* Firefox */
      width: -webkit-min-content; /* Chrome */
    }
    <p class="minblue">The Mozilla community produces a lot of great software.</p>

    Specifications

    Specification Status Comment
    CSS Basic Box Model
    The definition of 'width' in that specification.
    Working Draft Added the max-content, min-content, available, fit-content, border-box, content-box keywords.
    CSS Transitions
    The definition of 'width' in that specification.
    Working Draft Lists width as animatable.
    CSS Level 2 (Revision 1)
    The definition of 'width' in that specification.
    Recommendation Precises on which element it applies to.
    CSS Level 1
    The definition of 'width' in that specification.
    Recommendation Initial specification.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support (Yes) 1.0 (1.7 or earlier) 4 3.5 1.0 (85)
    Animatability ? 16.0 (16.0) ? ? ?
    max-content 22 -webkit 3.0 (1.9)-moz ? 15 -webkit

    2.0 (421) (intrinsic value)

    6.1 -webkit

    min-content 22 -webkit 3.0 (1.9) -moz ? 15 -webkit 6.1 -webkit
    available Not supported 3.0 (1.9) -moz ? ? ?
    fill-available (Yes) Not supported ? ? ?
    fit-content 22 -webkit 3.0 (1.9) -moz ? 15 -webkit 6.1 -webkit
    border-box and content-box Not supported Not supported Not supported Not supported Not supported
    Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
    Basic support ? ? ? ? ?

    See also

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