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How to use css counter-increment attribute
- (*-*)浩Original
- 2019-05-29 10:05:091909browse
The counter-increment property sets the counter increment for each occurrence of a selector. The default increment is 1.
Description
Using this attribute, the counter can be incremented (or decremented) by a certain value, which can be positive or negative value. If no number value is provided, it defaults to 1.
Note: If "display: none" is used, the count cannot be incremented. If "visibility: hidden" is used, the count can be increased.
| Value | Description |
| none |
default. Selector has no counter increment. |
| id number |
id defines the selector, id, or class that will increment the count. number defines the increment. number can be positive, zero, or negative. |
| inherit |
Specifies that the value of the counter-increment attribute should be inherited from the parent element. |
Example
Number sections and subsections (e.g. "Section 1", "1.1", "1.2 ") method:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<style type="text/css">
body {counter-reset:section;}
h1 {counter-reset:subsection;}
h1:before
{
counter-increment:section;
content:"Section " counter(section) ". ";
}
h2:before
{
counter-increment:subsection;
content:counter(section) "." counter(subsection) " ";
}
</style>
</head>
<body>
<p><b>注释：</b>如果已规定 !DOCTYPE，那么 Internet Explorer 8 （以及更高版本）支持 counter-increment 属性。</p>
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