What is pseudo element?

Answer 1

A CSS pseudo-element is used to style specified parts of an element. For example, it can be used to: Style the first letter, or line, of an element. Insert content before, or after, the content of an element.

Answer 2

p::first-line {
color: #ff0000;
font-variant: small-caps;
}

Answer 3

after p::after Insert something after the content of each <p> element
::before p::before Insert something before the content of each <p> element
::first-letter p::first-letter Selects the first letter of each <p> element
::first-line p::first-line Selects the first line of each <p> element
::selection p::selection Selects the portion of an element that is selected by a user