What is the function of pseudo-element::marker in CSS?

What is the function of pseudo-element::marker in CSS, specific code examples are needed

The function of pseudo-element::marker in CSS is to mark list items Partially styled. In a regular HTML list, the markup part refers to the bullet, number, or custom style in front of the list item. By using the ::marker pseudo-element, we can customize the appearance of the marked portion of the list items, thus enhancing the visual effect of the web page.

The following are some commonly used code examples to demonstrate the specific application of ::marker pseudo-element:

1. Customized unordered list mark style:

ul {
  list-style-type: none;
}

li::marker {
  content: "★";
  color: red;
  font-weight: bold;
}

In the above code, we first cancel the default mark style of the unordered list, that is, set list-style-type to none. Next, use the ::marker pseudo-element to style the marker portion of the list item. In this example, we set the tag content to ★, the color to red, and the font weight to bold.

2. Customized ordered list mark style:

ol {
  list-style-type: none;
}

li::marker {
  content: counter(li);
  color: blue;
  font-size: 20px;
  margin-right: 10px;
}

In the above code, we also cancel the default mark style of the ordered list. Then, use the ::marker pseudo-element to style the marker portion of the list item. In this example, we set the marker content to the count value of the list items, using counter(li). We also set the marker color to blue, the font size to 20 pixels, and the right margin of the marker portion to 10 pixels.

It should be noted that the ::marker pseudo-element can only be applied to list items (i.e. li elements) and cannot be applied to other types of elements, such as paragraphs (p elements) or titles (h1-h6 elements) wait.

Summary:
The pseudo-element ::marker in CSS can be used to customize the marking part of the list item. By setting the relevant attributes of the ::marker pseudo-element, we can change the content, color, font style, etc. of the mark, thereby increasing the visual effect of the web page. The above example code can help us better understand and use the ::marker pseudo-element.

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