CSS Selectors
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Questions and Answers

What is the purpose of the * selector in CSS?

  • To select a specific class
  • To select a specific ID
  • To select a specific element
  • To match all elements (correct)

What type of selector is used to select an element with a specific class?

  • Class selector (correct)
  • ID selector
  • Element selector
  • Pseudo-class selector

What is the purpose of the :hover pseudo-class in CSS?

  • To select an element that is being clicked
  • To select an element with focus
  • To select a visited link
  • To select an element when the mouse is over it (correct)

What type of combinator is used to select an element that is a direct child of another element?

<p>Child combinator (D)</p> Signup and view all the answers

What is the purpose of the :not() pseudo-class in CSS?

<p>To negate a selector (C)</p> Signup and view all the answers

How many points is an ID selector worth in terms of specificity?

<p>100 points (A)</p> Signup and view all the answers

Study Notes

CSS Selectors

Types of Selectors

  • Simple Selectors:
    • * - Universal selector (matches all elements)
    • E - Element selector (e.g., div, p, span)
    • .class - Class selector (e.g., .header, .footer)
    • #id - ID selector (e.g., #header, #footer)
  • Combinators:
    • E F - Descendant combinator (e.g., div p, body .header)
    • E &gt; F - Child combinator (e.g., div &gt; p, body &gt; .header)
    • E + F - Adjacent sibling combinator (e.g., h2 + p, li + li)
    • E ~ F - General sibling combinator (e.g., h2 ~ p, li ~ li)
  • Pseudo-classes:
    • :link - Unvisited link
    • :visited - Visited link
    • :hover - Mouse over element
    • :active - Element being clicked
    • :focus - Element with focus
    • :first-child - First child element
    • :last-child - Last child element
    • :nth-child(n) - nth child element
  • Pseudo-elements:
    • ::before - Insert content before element
    • ::after - Insert content after element
    • ::first-letter - First letter of element
    • ::first-line - First line of element

Selector Combinations

  • Chaining:
    • Combine multiple selectors (e.g., div.header, .header .logo)
  • Grouping:
    • Combine multiple selectors with commas (e.g., div, p, span, .header, .footer)
  • Negation:
    • :not() - Negate a selector (e.g., :not(div), :not(.header))

Selector Specificity

  • Inline styles: 1000 points
  • IDs: 100 points
  • Classes, pseudo-classes, and attributes: 10 points
  • Elements and pseudo-elements: 1 point

CSS Selectors

Types of Selectors

  • Universal Selector: * matches all elements
  • Element Selector: E selects elements based on their name (e.g., div, p, span)
  • Class Selector: .class selects elements based on their class name (e.g., .header, .footer)
  • ID Selector: #id selects elements based on their ID (e.g., #header, #footer)
  • Descendant Combinator: E F selects elements that are descendants of another element (e.g., div p, body.header)
  • Child Combinator: E &gt; F selects elements that are direct children of another element (e.g., div &gt; p, body &gt; .header)
  • Adjacent Sibling Combinator: E + F selects elements that are immediately preceded by another element (e.g., h2 + p, li + li)
  • General Sibling Combinator: E ~ F selects elements that are preceded by another element (e.g., h2 ~ p, li ~ li)
  • Pseudo-classes: used to select elements based on their state or position
    • :link selects unvisited links
    • :visited selects visited links
    • :hover selects elements when the mouse is over them
    • :active selects elements when they are being clicked
    • :focus selects elements when they have focus
    • :first-child selects the first child element
    • :last-child selects the last child element
    • :nth-child(n) selects the nth child element
  • Pseudo-elements: used to select and style parts of elements
    • ::before inserts content before an element
    • ::after inserts content after an element
    • ::first-letter selects the first letter of an element
    • ::first-line selects the first line of an element

Selector Combinations

  • Chaining: combining multiple selectors to select a specific element (e.g., div.header, .header.logo)
  • Grouping: combining multiple selectors with commas to select multiple elements at once (e.g., div, p, span, .header, .footer)
  • Negation: using the :not() pseudo-class to negate a selector (e.g., :not(div), :not(.header))

Selector Specificity

  • Inline styles: have a specificity of 1000 points
  • IDs: have a specificity of 100 points
  • Classes, pseudo-classes, and attributes: have a specificity of 10 points
  • Elements and pseudo-elements: have a specificity of 1 point

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Description

Quiz about types of CSS selectors, including simple selectors and combinators. Learn about universal, element, class, and ID selectors, as well as descendant, child, and adjacent sibling combinators.

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