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pseudo-selectors.md

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⚑ Pseudo Selectors

It allows to style elements based on their state or relationship to other elements. They provide additional flexibility in CSS styling.

There are 3 common type of pseudo-selectors in CSS.

☴ Overview:

  1. Structural Pseudo Selectors
  2. State Pseudo Selectors
  3. Content Pseudo Selectors

✦ Structural Pseudo Selectors:

This type of pseudo-selectors targets element based on the HTML document positions.

The list of structural pseudo-selectors:

  • :root: Targets the root element of the document (typically ).
  • :first-child: Targets the first child element of its parent.
  • :last-child: Targets the last child element of its parent.
  • :nth-child(n): Targets the nth child element of its parent, where n is an integer.
  • :nth-of-type(n): Targets the nth element of a specific type within its parent.
  • :only-child: Targets an element that is the only child of its parent.
  • :first-of-type: Targets the first element of a specific type within its parent.
  • :last-of-type: Targets the last element of a specific type within its parent.
  • :only-of-type: Targets an element that is the only element of its type within its parent.
  • :empty: Targets an element that has no children.
  • :target: Targets an element that is the current target of a hyperlink.
  • :not(): Targets elements that do not match a specified selector or set of selectors.
  • :has(): Targets elements that have a specific child or descendant element or property or value or anything related to the element.
/* Root pseudo-selectors used for defining CSS variables */
:root {
  --text-color: black;
}

/* This will set style to first child of the div elements */
div:first-child {
  color: blue;
}

/* not pseudo-selectors */
button:not(:first-child) {
  ...
}

/* has pseudo-selectors */
button:has(.icon-button) {
  ...
}

button:has(svg) {
  ...
}

/* light and dark theme selection based css selector */
body:has(#theme option[value="dark"]:checked) {
  background: black;
  color: white;
}

✦ State Pseudo Selectors:

It targets elements based on their current state of behavior.

The list of structural pseudo-selectors:

  • :hover: Targets an element when the mouse pointer is hovering over it.
  • :active: Targets an element when it is activated (e.g., clicked or tapped).
  • :focus: Targets an element when it is focused (e.g., by keyboard or mouse).
  • :visited: Targets an element that has been visited by the user.
  • 🔗 Targets an anchor element that has not been visited.
  • :checked: Targets a checked input element (e.g., checkbox, radio button).
  • :disabled: Targets a disabled element.
  • :enabled: Targets an enabled element.
  • :focus-within: Targets an element and its descendants when any of them is focused.
/* It bolds the text of anchor tag when it is hovered */
a:hover {
  font-weight: bold;
}

✦ Content Pseudo Selectors:

It targets a element on before or after basis.

/* This will insert '+' before the paragraph tag */
p::before {
  content: "+";
  color: red;
}

/* This will insert '\' after the paragraph tag */
p::after {
  content: "\";
  color: blue;
}

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