HTML

The DOM Style flexBasis property is used to set or return the initial length of a flexible item.

Note: If the element is not a flexible item, this property would have no effect.

Syntax:

It returns the flexBasis Property:

object.style.flexBasis

It used to set the flexBasis Property:

object.style.flexBasis = "number | auto | initial | inherit"

Return Values: It returns a string value, which represents the flex-basis property of an element.

Property Values:

number: This is used to specify the initial length in terms of fixed the length units or a percentage.
auto: This is used to set the length according to the length of the flexible item. The length will however, be according to the content if length is not specified. This is the default value.
initial: This is used to set this property to its default value.
inherit: This inherits the property from its parent.

Example-1: Using the number value.

<!DOCTYPE html>
<html>
 
<head>
    <title>
        DOM Style flexBasis property
    </title>
 
    <style>
        .main {
            width: 300px;
            height: 150px;
            border: 1px solid;
            display: flex;
        }
         
        .main div {
            width: 250px;
            height: 150px;
            font-size: 2rem;
            text-align: center;
        }
    </style>
</head>
 
<body>
    <h1 style="color: green">
      w3wiki
  </h1>
    <b>DOM Style flexBasis</b>
 
    <p>
      Click the button to change the value
      of the flexBasis to "100px"
    </p>
 
    <div class="main">
        <div style="background-color:green;">
            Beginner</div>
        <div id="div1"
             style="background-color:lightgreen;">
            For</div>
        <div style="background-color:green;">
            Beginner</div>
    </div>
 
    <button onclick="changeFlexBasis()">
        Change flexBasis
    </button>
 
    <script>
        function changeFlexBasis() {
            document.querySelector(
                '#div1').style.flexBasis = "100px";
        }
    </script>
 
</body>
 
</html>

Output:

Before clicking the button:

After clicking the button:

Example-2: Using the auto value.

html

<!DOCTYPE html>
<html>
<head>
    <title>
        DOM Style flexBasis property
    </title>
 
    <style>
        .main {
            width: 300px;
            height: 150px;
            border: 1px solid;
            display: flex;
        }
         
        .main div {
            width: 250px;
            height: 150px;
            font-size: 2rem;
            text-align: center;
        }
         
        #div1 {
            flex-basis: 50px;
        }
    </style>
</head>
 
<body>
    <h1 style="color: green">
      w3wiki
  </h1>
    <b>DOM Style flexBasis</b>
 
    <p>
      Click the button to change the
      value of the flexBasis to "auto"
    </p>
 
    <div class="main">
        <div style="background-color:green;">
            Beginner</div>
        <div id="div1" 
             style="background-color:lightgreen;">
            For</div>
        <div style="background-color:green;">
            Beginner</div>
    </div>
 
    <button onclick="changeFlexBasis()">
        Change flexBasis
    </button>
 
    <script>
        function changeFlexBasis() {
            document.querySelector(
                '#div1').style.flexBasis = "auto";
        }
    </script>
 
</body>
 
</html>

Output:

Before clicking the button:

After clicking the button:

Example-3: Using the initial value.

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        DOM Style flexBasis property
    </title>
 
    <style>
        .main {
            width: 300px;
            height: 150px;
            border: 1px solid;
            display: flex;
        }
         
        .main div {
            width: 250px;
            height: 150px;
            font-size: 2rem;
            text-align: center;
        }
         
        #div1 {
            flex-basis: 50px;
        }
    </style>
</head>
 
<body>
    <h1 style="color: green">
      w3wiki
  </h1>
    <b>DOM Style flexBasis</b>
 
    <p>
      Click the button to change the 
      value of the flexBasis to "initial"
    </p>
 
    <div class="main">
        <div style="background-color:green;">
            Beginner</div>
        <div id="div1" style="background-color:lightgreen;">
            For</div>
        <div style="background-color:green;">
            Beginner</div>
    </div>
 
    <button onclick="changeFlexBasis()">
        Change flexBasis
    </button>
 
    <script>
        function changeFlexBasis() {
            document.querySelector(
                '#div1').style.flexBasis = "initial";
        }
    </script>
 
</body>
 
</html>

Output:

Before clicking the button:

After clicking the button:

Example-4: Using the inherit value.

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        DOM Style flexBasis property
    </title>
 
    <style>
        #parent {
            flex-basis: 50%;
        }
         
        .main {
            width: 300px;
            height: 150px;
            border: 1px solid;
            display: flex;
        }
         
        .main div {
            width: 250px;
            height: 150px;
            font-size: 2rem;
            text-align: center;
        }
         
        #div1 {
            flex-basis: 50px;
        }
    </style>
</head>
 
<body>
    <h1 style="color: green">
      w3wiki
  </h1>
    <b>DOM Style flexBasis</b>
 
    <p>
      Click the button to change the value
      of the flexBasis to "inherit"
    </p>
    <div id="parent">
        <div class="main">
            <div style="background-color:green;">
                Beginner</div>
            <div id="div1" 
                 style="background-color:lightgreen;">
                For</div>
            <div style="background-color:green;">
                Beginner
            </div>
        </div>
    </div>
    <button onclick="changeFlexBasis()">
        Change flexBasis
    </button>
 
    <script>
        function changeFlexBasis() {
            document.querySelector(
                '#div1').style.flexBasis = "inherit";
        }
    </script>
 
</body>
 
</html>

Output:

Before clicking the button:

After clicking the button:

Supported Browsers: The browser supported by flexBasis property are listed below:

Google Chrome 29 and above
Edge 12 and above
Internet Explorer 11.0 and above
Firefox 22.0 and above
Opera 12.1 and above
Apple Safari 9 and above

HTML | DOM Style flexBasis Property

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