flex

The flex CSS property is shorthand for flex-grow, flex-shrink, and flex-basis.

Syntax

CSS

flex: value;

JS

object.style.flex = "value";

Values

<'flex'> = none | [ <'flex-grow'> <'flex-shrink'>? || <'flex-basis'> ]

none

Expands to 0 0 auto.

<'flex-grow'> = <number [0,∞]>

<number [0, ∞]>

An integer or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits. The first character may be preceded by a positive sign (+). The last character may be succeeded by an exponent (e or E) and an integer.

<'flex-shrink'> = <number [0,∞]>

<number [0, ∞]>

<'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).

Initial

0 1 auto

Examples

flex-basis | auto

flex-basis | content

flex-basis | length

flex-basis | max-content

flex-basis | min-content

flex-basis | percentage

flex-grow

flex-shrink

none

JS

<!doctype html>
<html>
<head>
    <style>
        #myid
        {
            display: flex;
        }
        #myid > div
        {
            background-image: linear-gradient(135deg, white, gray);
        }
        #myid > div:nth-of-type(1)
        {
            background-image: linear-gradient(135deg, white, yellow);
        }
    </style>
</head>
<body>
    <button onmouseover="myfunction('0 1 auto')">auto</button>
    <button onmouseover="myfunction('0 1 content')">content</button>
    <button onmouseover="myfunction('0 1 100px')">length</button>
    <button onmouseover="myfunction('0 1 max-content')">max-content</button>
    <button onmouseover="myfunction('0 1 min-content')">min-content</button>
    <button onmouseover="myfunction('0 1 20%')">percentage</button>
    <button onmouseover="myfunction('1 1 auto');flexGrow(2)">flex-grow</button>
    <button onmouseover="myfunction('0 1 25%');flexShrink(2)">flex-shrink</button>
    <button onmouseover="myfunction(innerHTML)">none</button>
    <div id="myid">
        <div>flex</div>
        <div>flex</div>
        <div>flex</div>
        <div>flex</div>
        <div>flex</div>
    </div>
    <script>
        function myfunction(myvar)
        {
            var elements = document.querySelector("#myid").querySelectorAll("div");
            for(var i = 0; i < elements.length; ++i)
            {
                elements[i].style.flex = myvar;
            }
        }
        function flexGrow(myvar)
        {
            document.querySelector("#myid").querySelector("div").style.flexGrow = myvar;
        }
        function flexShrink(myvar)
        {
            document.querySelector("#myid").querySelector("div").style.flexShrink = myvar;
        }
    </script>
</body>
</html>