CSS content properties: content, counter, and quotes-CSS Tutorial-php.cn

CSS content properties: content, counter, and quotes

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Release： 2023-10-21 11:31:53

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CSS content attributes: content, counter and quotes

In CSS, the content attribute (content), counter attribute (counter) and reference attribute (quotes) are some Very useful features that can help us enhance the functionality and style of web pages. This article explains these three properties in detail and provides specific code examples.

Content attribute (content)

The content attribute (content) can insert additional content in CSS, such as text, icons, pictures, etc. Its syntax is as follows:

content: value;

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Among them, value can be one of the following types:

1.1 Text content

We can directly insert text content in the content attribute, Enclose it in quotation marks. For example:

p::before {
    content: "开始：";
}

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The above code will insert the "Start:" text before each  element.

p::after {
    content: "结束。";
}

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The above code will insert the text "End." after each  element.

1.2 Add icon

Using the content attribute, we can also add icons, such as stylized icons or custom font icons using unicode encoding. For example:

.button::before {
    content: "055";
    font-family: FontAwesome;
}

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The above code inserts the "shopping cart" icon from the Font Awesome font set through the content attribute.

Counter attribute (counter)

The counter attribute (counter) allows us to create and manage counters in CSS. A counter is a custom variable that we can use to track the number of elements on the page and display it in the document as needed.

2.1 Create a counter

We can use the counter-reset attribute to create a counter, and use the counter-increment attribute to increase the value of the counter. For example:

ol {
    counter-reset: section;
}

li::before {
    counter-increment: section;
    content: counter(section) ". ";
}

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The above code will increment a counter for each list item in an ordered list and display the counter value before each list item.

2.2 Using counters

We can insert the counter value into the content attribute to display on the content of the element. For example:

h2::before {
    counter-increment: chapter;
    content: "第" counter(chapter) "章 ";
}

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The above code will add a chapter number in front of each <h2> element, setting it as an auto-increasing counter.

Quotation attributes (quotes)

The quotation attributes (quotes) are used to set the prefix and suffix of references in elements, which is achieved by setting the before and after pseudo-elements. For example:

q::before {
    content: open-quote;
}

q::after {
    content: close-quote;
}

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The above code will add quotation marks before and after the element, and use the open-quote and close-quote values to determine the style of the quotation marks.

Summary:

Content attributes (content), counter attributes (counter) and reference attributes (quotes) are very useful features in CSS. By using these properties, we can insert additional content into the style, create and manage counters, and change the style referenced in the element. The above is a detailed description and specific code examples of these three properties. I hope it will be helpful to you.

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