What are the front-end pseudo-class selectors?

Front-end pseudo-class selectors include:hover, :active, :focus, :first-child, :last-child, :nth-child(), :nth-of-type() and :not( )wait. Detailed introduction: 1. The :hover pseudo-class selector is used to apply styles when the mouse is hovering over an element. It is often used to create interactive effects, such as changing its color or background when the mouse is hovering over a link; 2. :active pseudo-class Class selectors are used to apply styles when an element is activated, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Front-end pseudo-class selectors are a very important part of CSS. They allow us to select and apply styles based on the state or position of elements. In this article, we will introduce some common front-end pseudo-class selectors.

1. :hover pseudo-class selector

:hover pseudo-class selector is used to apply styles when the mouse is hovering over the element. It is often used to create interactive effects, such as changing the color or background of a link when the mouse is hovered over it.

Example:

a:hover {
  color: blue;
}

2. :active pseudo-class selector

:active pseudo-class selector is used to apply styles when the element is activated. It is often used for click effects on buttons or links, such as changing the color or background of a button when the user clicks it.

Example:

button:active {
  background-color: yellow;
}

3. :focus pseudo-class selector

:focus pseudo-class selector is used to apply styles when the element gets focus. It is often used on form elements, such as changing the border color or background of an input box when the user clicks on it.

Example:

input:focus {
  border-color: red;
}

4. :first-child pseudo-class selector

:first-child pseudo-class selector is used to select the first child element of the parent element. It is often used to apply a special style to the first element in a list.

Example:

ul li:first-child {
  font-weight: bold;
}

5. :last-child pseudo-class selector

:last-child pseudo-class selector is used to select the last child element of the parent element. It is often used to apply a special style to the last element in a list.

Example:

ul li:last-child {
  color: red;
}

6. :nth-child() pseudo-class selector

:nth-child() pseudo-class selector is used to select the parent element child element at a specific position. It can accept a parameter that specifies the position of the child element to be selected.

Example:

ul li:nth-child(odd) {
  background-color: lightgray;
}

7. :nth-of-type() pseudo-class selector

:nth-of-type() pseudo-class selector is used to select the parent A specific type of child element of an element. It can accept a parameter that specifies the position of the child element to be selected.

Example:

ul li:nth-of-type(2n) {
  color: blue;
}

8. :not() pseudo-class selector

:not() pseudo-class selector is used to select elements that do not meet the specified conditions. It can accept a parameter that specifies the elements to exclude.

Example:

input:not([type="text"]) {
  display: none;
}

These are common pseudo-class selectors on the front end, they can help us select and apply styles based on the state or position of elements. By flexibly using these pseudo-class selectors, we can add more interactive effects and personalized styles to web pages.

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