CSS的border-collapse属性用于指定表格边框的合并方式。当设置为collapse时，相邻单元格的边框会合并为一条边框，使表格显得更加紧凑和整洁。这样可以避免单元格之间出现过多的重复边框线，提高表格的美观性和可读性。
Introduction: CSS Border-Collapse Property
The CSS Border-Collapse property is an essential feature for controlling border behavior in web design. It is used to combine the borders of adjacent table cells into a single border line, making the overall layout smoother, and reducing page clutter. This property can set either a “separate” or a “collapse” and involves the way borders are displayed in tables. In this article, we’ll explore the CSS Border-Collapse property, what it does, and how to use it effectively.
Syntax
The syntax for the CSS Border-Collapse property is fairly simple. It goes as follows:
border-collapse: separate | collapse | initial | inherit;
The keyword “separate” is the default value and creates a border that separates the cells. The “collapse” value collapses the borders so that adjacent ones become a single line.
Examples
Here are some examples of how the border-collapse property looks like in HTML code:
<table cellspacing="0" border="1" style="border-collapse: separate">
This code creates a table with a border which separates the cells.
<table cellspacing="0" border="1" style="border-collapse: collapse">
This code creates a table with a collapsed border, merging cells which have borders inner and outer.
Attributes
There are two main attributes to the CSS Border-Collapse property. The “separate” and “collapse” attributes indicate the type of border style on your table. Let’s see their usage below:
Separate
The separate attribute is the default value of the border-collapse property. It creates a visible border on the table, with an empty space between the border lines that surround each table cell. The following code shows how to apply the separate attribute:
<table cellspacing="0" border="1" style="border-collapse: separate">
The above code will display the table with separate borders surrounding each cell.
Collapse
The “collapse” attribute merges adjacent borders of the table cells into a single line. This attribute eliminates the empty space that separates the border lines of each cell in the table. This makes the layout smoother, and saves on space on the page. The following code shows how to apply the collapse attribute:
<table cellspacing="0" border="1" style="border-collapse: collapse">
The above code will display the table with borders that have been merged with adjacent cells.
Conclusion
The CSS Border-Collapse property is a useful tool for creating smooth and clean table layouts that are easy on the eye. It is simple to use and can make a considerable difference in the look and feel of your website. Take time to experiment with border styles using the border-collapse property, and see the difference it can make to your design.
