flex-basis

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The flex-basis CSS property sets the flex-basis longhand, which specifies the flex basis: the initial main size of the flex item, before free space is distributed according to the flex factors.

flex-basis: value;

object.style.flexBasis = "value";

<'flex-basis'> = content | <'width'>

content

Indicates an automatic size based on the flex item's content.

<'width'> = auto | <length-percentage> | min-content | max-content | fit-content( <length-percentage> )

auto

Automatically specified by the user agent.

<length-percentage> = [ <length> | <percentage> ]

<length>

Specifies the length using a number followed by a unit of measurement.

<percentage>

Specifies the percentage using a number followed by a percent sign (%).

min-content

Represents the largest min-content contribution of the items occupying the track.

max-content

Represents the largest max-content contribution of the items occupying the track.

fit-content()

Represents the formula max(minimum, min(limit, max-content)), where minimum represents an auto minimum (which is often, but not always, equal to a min-content minimum), and limit is the track sizing function passed as an argument to fit-content(). This is essentially calculated as the smaller of minmax(auto, max-content) and minmax(auto, limit).

auto

<!doctype html>
<html>
<head>
    <style>
        #myid {
            display: flex;
        }
        #myid > div {
            background-image: linear-gradient(135deg, white, gray);
        }
    </style>
    <script>
        function mouseover(value) {
            var elements = document.getElementById("myid").getElementsByTagName("div");
            for (var i = 0; i < elements.length; ++i) {
                elements[i].style.flexBasis = value;
            }
        }
    </script>
</head>
<body>
    <input onmouseover="mouseover(value)" type="button" value="auto">
    <input onmouseover="mouseover(value)" type="button" value="content">
    <button onmouseover="mouseover(value)" value="100px">length</button>
    <input onmouseover="mouseover(value)" type="button" value="max-content">
    <input onmouseover="mouseover(value)" type="button" value="min-content">
    <button onmouseover="mouseover(value)" value="20%">percentage</button>
    <div id="myid">
        <div>flex-basis</div>
        <div>flex-basis</div>
        <div>flex-basis</div>
        <div>flex-basis</div>
        <div>flex-basis</div>
    </div>
</body>
</html>

flex

flex-grow

flex-shrink

World Wide Web Consortium (W3C)

Syntax

CSS

JS

Values

Initial

Examples

auto

content

length

max-content

min-content

percentage

JS

Links

Internal

External