Tips (Total 4)
# Tips-1) What is HTML Table Colgroup
The <colgroup> element is used to style specific columns of a table.
If you want to style the two first columns of a table, use the <colgroup> and <col> elements.
Full Example of HTML Table Colgroup
The <colgroup> element should be used as a container for the column specifications. Each group is specified with a <col> element. The span attribute specifies how many columns that get the style. The style attribute specifies the style to give the columns.
index.html
Example:
HTML
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
border-collapse: collapse;
}
</style>
</head>
<body>
<h2>Colgroup</h2>
<p>Add the a colgroup with a col element that spans over two columns to define a style for the two columns:</p>
<table style="width: 100%;">
<colgroup>
<col span="2" style="background-color: #D6EEEE">
</colgroup>
<tr>
<th>MON</th>
<th>TUE</th>
<th>WED</th>
<th>THU</th>
<th>FRI</th>
<th>SAT</th>
<th>SUN</th>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
<td>7</td>
</tr>
<tr>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
</tr>
<tr>
<td>15</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
<td>21</td>
</tr>
<tr>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td>27</td>
<td>28</td>
</tr>
</table>
</body>
</html>
Output should be:
Note: The <colgroup> tag must be a child of a <table> element and should be placed before any other table elements, like <thead>, <tr>, <td> etc., but after the <caption> element, if present.
# Tips-2) How to create HTML Multiple Col Elements
If you want to style more columns with different styles, use more <col> elements inside the <colgroup>:
Full Example of HTML Multiple Col Elements
Add multiple col elements in the colgroup:
index.html
Example:
HTML
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
border-collapse: collapse;
}
</style>
</head>
<body>
<h2>Multiple Col Elements</h2>
<p>Add multiple col elements in the colgroup:</p>
<table style="width: 100%;">
<colgroup>
<col span="2" style="background-color: #D6EEEE">
<col span="3" style="background-color: pink">
</colgroup>
<tr>
<th>MON</th>
<th>TUE</th>
<th>WED</th>
<th>THU</th>
<th>FRI</th>
<th>SAT</th>
<th>SUN</th>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
<td>7</td>
</tr>
<tr>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
</tr>
<tr>
<td>15</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
<td>21</td>
</tr>
<tr>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td>27</td>
<td>28</td>
</tr>
</table>
</body>
</html>
Output should be:
# Tips-3) How to create HTML Table Empty Colgroups
If you want to style columns in the middle of a table, insert a "empty" <col> element (with no styles) for the columns before:
Full Example of HTML Table Empty Colgroups
Add "empty" col elements that represents the columns before the columns you want to style:
index.html
Example:
HTML
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
border-collapse: collapse;
}
</style>
</head>
<body>
<h2>Empty Colgroups</h2>
<p>Add "empty" col elements that represents the columns before the columns you want to style:</p>
<table style="width: 100%;">
<colgroup>
<col span="3">
<col span="2" style="background-color: pink">
</colgroup>
<tr>
<th>MON</th>
<th>TUE</th>
<th>WED</th>
<th>THU</th>
<th>FRI</th>
<th>SAT</th>
<th>SUN</th>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
<td>7</td>
</tr>
<tr>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
</tr>
<tr>
<td>15</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
<td>21</td>
</tr>
<tr>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td>27</td>
<td>28</td>
</tr>
</table>
</body>
</html>
Output should be:
# Tips-4) How to Hide Columns of HTML Table
You can hide columns with the visibility: collapse property:
Full Example of Hidding Columns in a HTML Table
You can hide specific columns with the visibility property:
index.html
Example:
HTML
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
border-collapse: collapse;
}
</style>
</head>
<body>
<h2>Hide Columns</h2>
<p>You can hide specific columns with the visibility property:</p>
<table style="width: 100%;">
<colgroup>
<col span="2">
<col span="3" style="visibility: collapse">
</colgroup>
<tr>
<th>MON</th>
<th>TUE</th>
<th>WED</th>
<th>THU</th>
<th>FRI</th>
<th>SAT</th>
<th>SUN</th>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
<td>7</td>
</tr>
<tr>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
</tr>
<tr>
<td>15</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
<td>21</td>
</tr>
<tr>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td>27</td>
<td>28</td>
</tr>
</table>
<p><b>Note:</b> The table columns does not collapse properly in Safari browsers.</p>
</body>
</html>
Output should be:
