What elements have pseudo elements?

Elements with pseudo elements include block-level elements and inline block-level elements. Detailed description: 1. Block-level elements refer to elements that occupy a line independently in the document flow. Common block-level elements include div, p, h1, etc. These elements can use pseudo-elements to insert generated content; 2. Inline block-level Elements refer to elements that are displayed alongside other elements in the document flow. Common inline block-level elements include span, button, input, etc. These elements also support the use of pseudo-elements.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Pseudo elements are selectors used to insert generated content before or after the content of an element. Not all elements support pseudo-elements, only some specific elements can use pseudo-elements.

In CSS2, only some elements support pseudo-elements. The following are some common elements that support pseudo-elements:

1. Block-level elements: Block-level elements refer to elements that independently occupy a line in the document flow. Common block-level elements include "div", "p", "h1", etc. These elements can use pseudo-elements to insert generated content. For example, you can use the "" pseudo-element to insert a generated content before the content of a block-level element:

div::before {
  content: "前缀：";
  font-weight: bold;
}

2. Inline-block elements: Inline-block elements refer to the elements in the document flow. An element that appears alongside other elements. Common inline block-level elements include span, button, input, etc. These elements also support the use of pseudo-elements. For example, you can use the "::after" pseudo-element to insert a generated content after the content of an inline block-level element:

span::after {
  content: "后缀";
  font-style: italic;
}

It should be noted that not all elements support pseudo-element. element. For example, replaced elements such as "img" and "input" and some form elements generally do not support pseudo-elements. This is because pseudo-elements are used to insert generated content before or after the content of an element, whereas the content of replacement elements and form elements is determined by user input or external resources and cannot be generated or styled through CSS.

If you want to determine whether a specific element supports pseudo-elements, you can consult the CSS specification or view the element's style rules in the browser developer tools. During the development process, you can choose appropriate elements to use pseudo-elements as needed to achieve richer style effects and layouts.

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