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Solution to the problem that the border set by the tr tag in HTML is not displayed_html/css_WEB-ITnose
Solution to the problem that the border set by the tr tag in HTML is not displayed_html/css_WEB-ITnose
When I was operating the table today, I found that the borders of the rows in the table were not displayed. Then I created a new table and found that it was indeed not displayed.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title></head><style> } tr{ border:1px solid #ccc; }</style><body><table> <tr> <td>内容</td> <td>内容</td> <td>内容</td> </tr> <tr> <td>内容</td> <td>内容</td> <td>内容</td> </tr> <tr> <td>内容</td> <td>内容</td> <td>内容</td> </tr></table></body></html>In The preview in the browser does not display
Later I found that I only need to add a line of code to display
table{ border-collapse: collapse; }Later, I checked the manual’s definition of this attribute
CSS border-collapse attribute
Set a merged border model for the table:
Attribute definition and usage Description
The border-collapse attribute sets whether the table's borders are merged into a single border, or displayed separately as in standard HTML.
| separate |
| yes |
| CSS2 |
| object object.style.borderCollapse="collapse" |
Browser Support
All major browsers support the border-collapse attribute.
Note: Any version of Internet Explorer (including IE9) supports the attribute value "inherit".
Note: border-collapse attribute, if !DOCTYPE is not specified, may produce unexpected effects.
Property Values
| collapse | 如果可能，边框会合并为一个单一的边框。会忽略 border-spacing 和 empty-cells 属性 |
| separate | 默认值。边框会被分开。不会忽略 border-spacing 和 empty-cells 属性 |
| inherit | 规定应该从父元素继承 border-collapse 属性的值 |
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