HTML | DOM Column span Property

The DOM Column span Property is used to set or return the value of a span attribute of a <column> element. The colspan attribute in HTML specifies the number of columns a cell should span.

Syntax:

It is used to return the span property.
```
columnObject.span
```
It is used to set the Column span property.
```
columnObject.span = number
```

Property Values:

number: It specifies the number of the column that a cell should span. It does not allow negative values.

Return Values: It returns a numeric value which represent the number of columns.

Example-1: This Example that illustrate how to return the column span Property.

<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML | DOM Column span Property
    </title>
</head>
<style>
    #myCol {
        background: green;
    }
      
    table {
        color: white;
        margin-left: 150px;
    }
      
    #Geek_p {
        color: green;
        font-size: 30px;
    }
      
    td {
        padding: 10px;
    }
</style>
  
<body style="text-align:center;">
  
    <h1 style="color:green;"> 
            GeeksForGeeks 
        </h1>
  
    <h2>HTML | DOM Column span Property</h2>
    <table>
        <colgroup>
          <col id="myCol" span="2">
            <col style="background-color:green">
        </colgroup>
        <tr>
            <th>S.No</th>
            <th>Title</th>
            <th>Geek_id</th>
        </tr>
        <tr>
            <td>Geek_1</td>
            <td>GeekForGeeks</td>
            <th>Geek_id_1</th>
        </tr>
        <tr>
            <td>Geek_2</td>
            <td>GeeksForGeeks</td>
            <th>Geek_id_2</th>
        </tr>
    </table>
    <br>
    <button onclick="myGeeks()">
        Click
    </button>
    <h4> 
            <p id="Geek_p"
               style="color:green">
      </p> 
        </h4>
    <script>
        function myGeeks() {
            // access col element 
            var x = document.getElementById(
                "myCol").span;
            document.getElementById(
                "Geek_p").innerHTML = x;
        }
    </script>
</body>
  
</html>

Output:

Before Clicking On Button:

After Clicking In Button:

Example-2: This HTML Example illustrates how to set the column span Property.

<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML | DOM Column span Property
    </title>
</head>
<style>
    #gfg {
        background: green;
    }
      
    table {
        color: white;
        margin-left: 150px;
    }
      
    #Geek_p {
        color: green;
        font-size: 30px;
    }
      
    td {
        padding: 10px;
    }
</style>
  
<body style="text-align:center;">
  
    <h1 style="color:green;"> 
            GeeksForGeeks 
        </h1>
  
    <h2>HTML | DOM Column span Property</h2>
    <table>
        <colgroup>
          <col id="gfg" span="3">
            <col style=
               "background-color:green">
        </colgroup>
        <tr>
            <th>S.No</th>
            <th>Title</th>
            <th>Geek_id</th>
        </tr>
        <tr>
            <td>Geek_1</td>
            <td>GeekForGeeks</td>
            <th>Geek_id_1</th>
        </tr>
        <tr>
            <td>Geek_2</td>
            <td>GeeksForGeeks</td>
            <th>Geek_id_2</th>
        </tr>
    </table>
    <br>
    <button onclick="myGeeks()">
        Click
    </button>
    <h4> 
            <p id="Geek_p" 
               style="color:green">
      </p> 
        </h4>
    <script>
        function myGeeks() {
            // access col element 
            document.getElementById(
                "gfg").span = 2;
            document.getElementById("gfg").
            style.backgroundColor = "red";
  
        }
    </script>
</body>
  
</html>