Master advanced application skills and practical case sharing of pseudo-classes and pseudo-elements in CSS

Master the advanced application skills and practical case sharing of pseudo-classes and pseudo-elements in CSS

In front-end development, CSS is an essential technology. Through CSS It can beautify web pages and enhance user experience. In CSS, pseudo-classes and pseudo-elements are very powerful tools that can help developers achieve some special effects and make web pages richer and more diverse. This article will share some advanced application skills and practical cases about pseudo-classes and pseudo-elements, and provide corresponding code examples.

1. Pseudo-class

1. :hover pseudo-class

:hover pseudo-class is used when the user hovers the mouse over an element. Change the style of this element. This is a method often used when developing an interactive web page.

For example, we can change the background color of a button when we hover the mouse over it:

.btn:hover {
    background-color: red;
}

2. :nth-child(n) pseudo-class

:nth-child(n) pseudo-class can select the nth child element under a certain parent element, where n can be a specific number or a formula.

For example, we can select the even-numbered child element under the parent element and modify its font color:

.parent div:nth-child(even) {
    color: blue;
}

3. :checked pseudo-class

: The checked pseudo-class can select selected form elements, such as check boxes or radio buttons. We can use this pseudo-class to achieve some special effects.

For example, when we select a check box, we can modify the style of its corresponding element:

.checkbox:checked + .label {
    color: red;
}

2. Pseudo-element

1. ::before pseudo-element

::before pseudo-element can insert content in front of an element. This pseudo-element is often used to achieve some special effects, such as adding some icons in front of text.

For example, we can add an arrow icon in front of each list item:

li::before {
    content: "92";
}

2. ::after pseudo-element

::after pseudo-element Content can be inserted after an element. Similarly, this pseudo-element is often used to achieve some special effects, such as adding some decorative elements behind the text.

For example, we can add a horizontal line after each paragraph:

p::after {
    content: "";
    display: block;
    width: 100%;
    height: 1px;
    background-color: black;
}

3. ::selection pseudo-element

::selection pseudo-element is used for Change the style of text when it is selected. This pseudo element can help developers achieve some unique selection effects.

For example, when we select text in a web page, we can change its background color and text color to red:

::selection {
    background-color: red;
    color: white;
}

Through the above-mentioned advanced application skills and practical cases of pseudo-classes and pseudo-elements , we can find that they can really help us achieve some very cool effects. Of course, these are only a small part of them, and there are actually many applications.

In short, mastering the advanced application skills of pseudo-classes and pseudo-elements in CSS can not only make our web pages richer and more diverse, but also improve the user experience and bring better visual effects to users. I hope the content of this article is helpful to you, and you are welcome to explore more applications of pseudo classes and pseudo elements.

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