Property nesting for related styles in SASS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to nest the color property inside the p selector.

SASS

p {
  [1]: blue;
}

Drag options to blanks, or click blank then click option'

Acolor

Bmargin

Cbackground

Dfont-size

Attempts:

3 left

💡 Hint

Common Mistakes

Using properties that do not affect text color like margin or background.

The color property sets the text color inside the p selector.

2fill in blank

medium

Complete the code to nest the :hover pseudo-class inside the a selector.

SASS

a {
  color: blue;
  [1] {
    color: red;
  }
}

Drag options to blanks, or click blank then click option'

A:focus

B:active

C:visited

D:hover

Attempts:

3 left

💡 Hint

Common Mistakes

Using :active or :visited which have different effects.

The :hover pseudo-class changes the link color when the mouse is over it.

3fill in blank

hard

Fix the error in nesting the span selector inside the div selector.

SASS

div {
  background: gray;
  [1] {
    color: white;
  }
}

Drag options to blanks, or click blank then click option'

A#span

B.span

Cspan

Ddiv span

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a dot or hash before span which changes it to class or id selector.

To nest the span selector inside div, just write span without extra symbols.

4fill in blank

hard

Fill both blanks to nest the h1 selector and its :after pseudo-element inside the header selector.

SASS

header {
  [1] {
    font-size: 2rem;
    [2] {
      content: ' - Welcome';
    }
  }
}

Drag options to blanks, or click blank then click option'

Ah1

B:before

C:after

Dfooter

Attempts:

3 left

💡 Hint

Common Mistakes

Using :before instead of :after for the pseudo-element.

Using footer instead of h1.

The h1 selector is nested inside header, and its :after pseudo-element adds content after the heading.

5fill in blank

hard

Fill all three blanks to nest the nav selector, its ul child, and the :hover pseudo-class for li inside nav.

SASS

nav {
  [1] {
    list-style: none;
    [2] {
      padding: 0.5rem;
      [3] {
        background-color: lightgray;
      }
    }
  }
}

Drag options to blanks, or click blank then click option'

Aul

Bli

C:hover

Da

Attempts:

3 left

💡 Hint

Common Mistakes

Using a instead of li or ul in nesting.

Using :active or other pseudo-classes instead of :hover.

The ul is nested inside nav, then li inside ul, and :hover pseudo-class inside li to style on mouse hover.

Practice

1. What is the main benefit of using property nesting in Sass?

easy

A. It groups related styles inside one block for better readability.

B. It automatically compiles CSS faster.

C. It removes the need for selectors in CSS.

D. It disables browser default styles.

Solution

1. Step 1: Understand the purpose of nesting

   Nesting groups related CSS rules inside one block, making the code easier to read and maintain.

2. Step 2: Compare options

   Only 'It groups related styles inside one block for better readability.' correctly describes this benefit. Other options describe unrelated or incorrect effects.

3. Final Answer:

   It groups related styles inside one block for better readability. -> Option A

4. Quick Check:

   Nesting groups styles = C [OK]

Hint: Nesting groups styles inside blocks for clarity [OK]

Common Mistakes:

• Thinking nesting speeds up CSS compilation
• Believing nesting removes selectors
• Assuming nesting disables default styles

2. Which of the following is the correct Sass syntax to nest a :hover style inside a button class?

easy

A. .button:hover { & { color: red; } }

B. .button { &:hover { color: red; } }

C. &.button { :hover { color: red; } }

D. .button { :hover & { color: red; } }

Solution

1. Step 1: Identify correct nesting syntax

   In Sass, & refers to the parent selector. To nest :hover, write .button { &:hover { ... } }.

2. Step 2: Check each option

   .button { &:hover { color: red; } } uses correct syntax. Others misuse & or place pseudo-class incorrectly.

3. Final Answer:

   .button { &:hover { color: red; } } -> Option B

4. Quick Check:

   Nesting with & before :hover = A [OK]

Hint: Use & before pseudo-class inside parent block [OK]

Common Mistakes:

• Placing & outside the parent selector
• Using :hover without & inside nesting
• Misplacing pseudo-class after &

3. Given the Sass code:

.card {
  background: white;
  &:hover {
    background: gray;
  }
  .title {
    font-weight: bold;
  }
}

What is the compiled CSS output?

medium

A. .card { background: white; } .card:hover { background: gray; } .card .title { font-weight: bold; }

B. .card { background: white; } &:hover { background: gray; } .title { font-weight: bold; }

C. .card { background: white; } .card:hover { background: gray; } .title { font-weight: bold; }

D. .card { background: white; } .card:hover { background: gray; } .card.title { font-weight: bold; }

Solution

1. Step 1: Understand nesting output

   The &:hover becomes .card:hover. The nested .title becomes .card .title.

2. Step 2: Match compiled CSS

   .card { background: white; } .card:hover { background: gray; } .card .title { font-weight: bold; } correctly shows all selectors expanded properly. Others miss the parent selector or combine incorrectly.

3. Final Answer:

   .card { background: white; } .card:hover { background: gray; } .card .title { font-weight: bold; } -> Option A

4. Quick Check:

   Nesting expands selectors fully = B [OK]

Hint: Nested selectors become parent + child in CSS [OK]

Common Mistakes:

• Forgetting to prepend parent selector to nested classes
• Leaving & in compiled CSS
• Combining classes without space incorrectly

4. Identify the error in this Sass code:

.nav {
  color: black;
  &:hover {
    color: blue;
  }
  &.active {
    color: red;
  }
  .item {
    font-size: 1rem;
  }
  &:item {
    font-weight: bold;
  }
}

medium

A. The nested .item selector should be outside the .nav block.

B. The &.active selector is incorrect and should be .active.

C. The &:hover pseudo-class is not allowed inside nesting.

D. The selector &:item is invalid and should be .item.

Solution

1. Step 1: Review each nested selector

   &:hover and &.active are valid. .item nested inside .nav is correct.

2. Step 2: Identify invalid selector

   &:item is invalid because :item is not a valid pseudo-class. It should be .item without &:.

3. Final Answer:

   The selector &:item is invalid and should be .item. -> Option D

4. Quick Check:

   Invalid pseudo-class &:item = A [OK]

Hint: Pseudo-classes start with :, classes with . [OK]

Common Mistakes:

• Using & with invalid pseudo-class
• Confusing class and pseudo-class syntax
• Moving nested selectors outside parent unnecessarily

5. You want to style a card component so that when hovered, its title text turns blue and the card background changes to light gray. Using property nesting, which Sass code achieves this correctly?

hard

A. .card {
background: white;
&:hover {
.title {
background: lightgray;
color: blue;
}
}
.title {
color: black;
}
}

B. .card {
background: white;
.title {
color: black;
&:hover {
color: blue;
}
}
&:hover {
background: lightgray;
}
}

C. .card {
background: white;
&:hover {
background: lightgray;
}
.title {
color: black;
}
&:hover .title {
color: blue;
}
}

D. .card {
background: white;
&:hover {
background: lightgray;
}
.title:hover {
color: blue;
}
.title {
color: black;
}
}

Solution

1. Step 1: Understand the hover effect scope

   The card's background changes on hover, and the title text color changes only when the card is hovered, not the title itself.

2. Step 2: Check nesting for hover on parent affecting child

   .card { background: white; &:hover { background: lightgray; } .title { color: black; } &:hover .title { color: blue; } } uses &:hover .title to style the title when the card is hovered, which is correct. .card { background: white; &:hover { .title { background: lightgray; color: blue; } } .title { color: black; } } nests .title inside &:hover but incorrectly applies background: lightgray to .title instead of the card. .card { background: white; .title { color: black; &:hover { color: blue; } } &:hover { background: lightgray; } } incorrectly applies hover on .title itself. .card { background: white; &:hover { background: lightgray; } .title:hover { color: blue; } .title { color: black; } } styles .title:hover, which triggers only when hovering the title, not the card.

3. Final Answer:

   .card { background: white; &:hover { background: lightgray; } .title { color: black; } &:hover .title { color: blue; } } -> Option C

4. Quick Check:

   Parent hover affecting child style = D [OK]

Hint: Use & hover then space child selector for nested hover effects [OK]

Common Mistakes:

• Applying hover on child instead of parent
• Nesting child inside &:hover block incorrectly
• Using child:hover instead of parent:hover child