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This article will explain in detail what the usage of colgroup tags in HTML is, Xiaobian thinks it is quite practical, so share it with you as a reference, I hope you can gain something after reading this article.

About the definition and usage of HTMLcolgroup tags:

Tags are used to group columns in a table to format them.

Labels are useful if you want to apply styles to all columns, so you don't have to repeat styles for individual cells and rows.

Labels can only be used in table elements.

Two colgroup elements specify different alignments and styles for the three columns in the table (note that the first colgroup element spans two columns):

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browser support

All major browsers support tags.

Firefox, Chrome, and Safari only support the span and width attributes of colgroup elements.

Optional attributes of HTMLcolgroup, as shown below:

Figure 1.png

Tips and comments about HTMLcolgroup and col elements:

Tip: Add a class attribute to the label. This allows you to use CSS to take care of alignment, width, color, and so on.

Note: The col element is an empty element that contains only attributes. To create columns, you must specify td elements inside tr elements.

The col tag defines attribute values for one or more columns in the table. The colgroup tag is used to group columns in a table to format them.

The HTMLcolgroup tag and col element are used as follows:

Their role is mainly to control the width of the cell, so save the trouble of defining each cell separately, in the past we often define the width in the first row th or td to specify the width of each column, and col can not only define the width but also define other attributes, such as col to control the sum of several column widths, but also to control the background color of this column. But the ideal is full, reality is the backbone, as mentioned earlier, the greater the function does not mean that its compatibility is stronger, according to the existing test down, col and colgroup can play a role can also ensure compatibility of the application is only two: width and background. For width, individuals prefer to use the conventional way, the first line sets the width, and the column width is guaranteed. For background, it is rare to use different backgrounds in large areas of tables in practice.

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