How many tags does an html pseudo element have?

html pseudo-element has 6 tags, namely: 1. ::before, inserting styled content in front of the element content; 2. ::after, inserting styled content after the element content ; 3. ::first-letter, style the first letter of the element; 4. ::first-line, style the first line of text of the element; 5. ::selection, style the text selected by the user; 6. ::placeholder, style the form element placeholder text.

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

HTML pseudo-element is a special CSS selector used to insert styled content before or after the content of the element. They are not real HTML tags, but are used in CSS.

HTML pseudo-elements mainly include the following types:

::before pseudo-element : Insert styled content in front of the element content. It is usually used to add some decorative content in front of elements, such as icons, reference symbols, etc.

::after pseudo-element: Insert styled content after the element content. It is usually used to add some decorative content behind the element, such as arrows, icons, etc.

::first-letter pseudo-element : used to style the first letter of an element. It can change the size, color, font and other style attributes of the initial letter to create a unique effect.

::first-line pseudo-element : Used to style the first line of text of an element. It can change the size, color, spacing and other style attributes of the first line of text to achieve special typesetting effects.

::selection pseudo-element : used to style the text selected by the user. By setting the style attribute of the ::selection pseudo-element, you can change the background color, text color and other styles of the text selected by the user.

::placeholder pseudo-element: Used to style the placeholder text of form elements. It can change the color, font and other style attributes of the placeholder text, thereby making the placeholder text different from the actual entered text.

The above are common HTML pseudo-elements, each pseudo-element has its own purpose and style attributes. They can be selected via CSS selectors and their appearance changed by setting style properties. In actual development, we can use HTML pseudo-elements to achieve some special effects and improve the interactivity and aesthetics of the page.

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