Why does input not support pseudo elements?

Input does not support pseudo elements because input is a self-closing tag with no content. Pseudo elements can be used to insert generated content before or after the content of the element, but the input element is a form control used to receive user input. Its content is input by the user and cannot be generated or styled through CSS. Therefore, the input element has no content for pseudo-elements to select and style, so pseudo-elements are not supported.

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

The input element is a form control in an HTML form, used to receive user input. It is a self-closing tag with no content, so pseudo-elements are not supported.

Pseudo-elements are special selectors used to select and style elements in CSS, such as `::before` and `::after`. Pseudo-elements can be used to insert generated content before or after the content of an element.

The input element is a form control used to receive user input. Its content is input by the user and cannot be generated or styled through CSS. Therefore, the input element has no content for pseudo-elements to select and style, so pseudo-elements are not supported.

If you want to style the input element, you can use CSS selectors and attribute selectors to select and style the `` element itself or its parent element. For example:

input[type="text"] {
  /* 样式化文本输入框 */
  /* ... */
}
input[type="submit"] {
  /* 样式化提交按钮 */
  /* ... */
}

Through selectors and attribute selectors, you can style different types of input elements differently.

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