In-depth understanding of CSS attribute selectors and examples

Detailed explanation and application examples of CSS attribute selectors

In CSS, we often need to select and modify specific element styles through selectors. In addition to common tag selectors (such as div, p, etc.), CSS also provides attribute selectors, which can select and modify styles based on the attribute values ​​of elements.

This article will introduce CSS attribute selectors in detail and give some practical application examples.

1. Attribute selector types

CSS attribute selectors mainly have the following three types:

1. Equal sign selector (=)

The equal sign selector is used to select elements whose attribute values ​​exactly match.

For example, to select all elements with the class attribute value "btn", you can use the following selector:

[class="btn"] {
    /* 样式规则 */
}

2. Selection starting with a certain value Selector (^=)

A selector starting with a certain value is used to select elements whose attribute value starts with a specific string.

For example, to select all img elements whose src attribute value starts with "http", you can use the following selector:

img[src^="http"] {
    /* 样式规则 */
}

3. Selector containing a certain value (*=)

Selector containing a certain value is used to select elements whose attribute value contains a specific string.

For example, to select all a elements whose href attribute value contains "example", you can use the following selector:

a[href*="example"] {
    /* 样式规则 */
}

2. Attributes Selector application examples

The following will give some practical application examples to help understand the use of attribute selectors.

1. Select elements with specific attributes

If you need to select elements with a specific attribute, you can use the equal sign attribute selector. For example, the following selector can select all elements containing the data-title attribute:

[data-title] {
    /* 样式规则 */
}

2. Select elements with a specific attribute value

if To select elements with a specific attribute value, you can use the equal sign attribute selector. For example, the following selector can be used to select all elements with the class attribute value "container":

[class="container"] {
    /* 样式规则 */
}

3. Select child elements with a specific attribute value

If you need to select a child element with a specific attribute value, you can use the equal sign attribute selector plus a child selector. For example, the following selector can be used to select all child elements whose data-title attribute value is "example" of the parent element:

[data-title="example"] > div {
    /* 样式规则 */
}

4. Modify the style according to a specific attribute value

If you need to modify the style based on a specific attribute value, you can use the equal sign attribute selector. For example, the following selector can select all elements with the class attribute value "btn" and set the background color to red:

[class="btn"] {
    background-color: red;
}

5. Partially match elements based on specific attribute values

If you need to select elements that partially match a specific attribute value, you can use a selector that contains a certain value. For example, the following selector can select all img elements whose alt attribute value contains "example" and set the border to a 1-pixel solid line:

img[alt*="example"] {
    border: 1px solid;
}

Summary:

This article introduces CSS attribute selectors and some practical application examples. Attribute selectors can select and modify styles based on the attribute values ​​of elements, providing more flexibility and precision in our style settings. I hope this article can help you understand and apply CSS attribute selectors.

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