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How to create numbers using the inverse increment property in CSS?

王林

Sep 06, 2023 pm 12:29 PM

如何使用 CSS 中的反增量属性创建编号？

The "counter-increment" property given in CSS is used to increase or decrease the counter value that we can display on the web page using CSS. CSS counters are very useful when we want to count the occurrences of HTML elements in a web page.

We will also use the "counter-reset" CSS property here, which helps us reset or initialize the CSS counter value to the desired number.

grammar

anti-increase -

css-counter increment-value;

Here, css-counter refers to the counter variable declared in CSS, and increment-value refers to the value to increase or decrease the CSS counter.

Counter reset: css counter reset value.

Here, css-counter refers to the counter variable declared in CSS, and reset-value refers to the value you want to reset the counter to.

Example 1

In this example, we will create a CSS counter to count the occurrences of the "p" tag and display its count on the web page. We set the initial count to 0 and increment the counter by 1 each time the "p" tag appears.

<html lang="en">
<head>
   <title>How to create numbering using counter-increment property in CSS?</title>
   <style>
      body {
         counter-reset: p-count;
      }
      p {
         counter-increment: p-count;
      }

      p::before {
         content: counter(p-count) ". ";
      }
   </style>
</head>
<body>
   <h3 id="How-to-create-numbering-using-counter-increment-property-in-CSS">How to create numbering using counter-increment property in CSS?</h3>
   <p>First paragraph</p>
   <p>Second paragraph</p>
</body>
</html>

Example 2

In this example, we will create 2 CSS counters to count the occurrences of the "p" tag and display the count on the web page. We will create a nested list structure where first we will display the number of "p" tags in numerical form and then the number of "sub" class "p" tags in Roman numeral format.

<html lang="en">
<head>
   <title>How to create numbering using counter-increment property in CSS?</title>
   <style>
      body {
         counter-reset: p-count;
      }
      .sub {
         counter-reset: sub-count;
         margin-left: 10px;
      }
      .par {
         counter-increment: p-count;
      }
      .child {
         counter-increment: sub-count;
      }

      .par::before {
         content: counter(p-count) ". ";
      }
      .child::before {
         content: counter(p-count, lower-roman) ". ";
      }
   </style>
</head>
<body>
   <h3 id="How-to-create-numbering-using-counter-increment-property-in-CSS">How to create numbering using counter-increment property in CSS?</h3>
   <p class="par">First paragraph</p>
   <p class="par">Second paragraph</p>
   <div class="sub">
      <p class="child">Sub first</p>
      <p class="child">Sub second</p>
   </div>
</body>
</html>

in conclusion

In this article, we learned how to use the "Counter Reset" and "Counter Increment" properties provided by CSS to create numbers and display them on a web page. “couter-reset” helps us reset the counter to a specific value and “counter-increment” helps us increase or decrease the counter by a specific value.

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