Line height in CSS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the line height of paragraphs to 1.5.

CSS

p {
  line-height: [1];
}

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

A1.5

B15px

Cnormal

D150%

Attempts:

3 left

💡 Hint

Common Mistakes

Using units like px when a unitless number is preferred for line height.

Using 'normal' which is default but not 1.5.

The line-height property controls the space between lines of text. Using 1.5 sets the line height to one and a half times the font size, which improves readability.

2fill in blank

medium

Complete the code to set the line height of headings to 2.

CSS

h1 {
  line-height: [1];
}

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

A2

Bnormal

C200%

D20px

Attempts:

3 left

💡 Hint

Common Mistakes

Adding units like px which changes meaning.

Using 'normal' which is default spacing.

Setting line-height to 2 doubles the space between lines relative to the font size, making headings more spaced out.

3fill in blank

hard

Fix the error in the code to correctly set line height to 1.2.

CSS

div {
  line-height: [1];
}

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

A12px

B1.2em

C1.2

Dnormal

Attempts:

3 left

💡 Hint

Common Mistakes

Adding units like em or px which can cause unexpected results.

Using 'normal' which is default but not 1.2.

Using a unitless number like 1.2 for line-height is best practice because it scales with the font size. Adding units like em or px can cause inconsistent spacing.

4fill in blank

hard

Fill both blanks to set line height to 1.4 and font size to 16px.

CSS

p {
  font-size: [1];
  line-height: [2];
}

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

A16px

B1.4

C14px

Dnormal

Attempts:

3 left

💡 Hint

Common Mistakes

Using unitless number for font size.

Using px units for line height which is less flexible.

Setting font-size to 16px defines the text size. Setting line-height to 1.4 means the space between lines is 1.4 times the font size, improving readability.

5fill in blank

hard

Fill all three blanks to set font size to 18px, line height to 1.6, and paragraph color to blue.

CSS

p {
  font-size: [1];
  line-height: [2];
  color: [3];
}

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

A16px

B1.6

Cblue

D18px

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up font size and line height values.

Using color names incorrectly.

Setting font-size to 18px makes text larger. line-height of 1.6 adds comfortable spacing between lines. color: blue changes text color to blue.

Practice

1. What does the CSS property line-height control in a webpage?

easy

A. The vertical space between lines of text

B. The color of the text

C. The font size of the text

D. The horizontal space between words

Solution

1. Step 1: Understand the property purpose

   The line-height property sets the amount of vertical space between lines of text in a block.

2. Step 2: Compare options to definition

   Only The vertical space between lines of text correctly describes vertical spacing between lines, others describe unrelated text styles.

3. Final Answer:

   The vertical space between lines of text -> Option A

4. Quick Check:

   Line height = vertical spacing [OK]

Hint: Line height = space vertically between text lines [OK]

Common Mistakes:

• Confusing line height with font size
• Thinking it controls text color
• Mixing it up with letter spacing

2. Which of the following is the correct syntax to set line height to 1.5 in CSS?

easy

A. lineheight = 1.5;

B. line-height: 1.5;

C. line-height = 1.5px;

D. lineHeight: 1.5;

Solution

1. Step 1: Recall CSS property syntax

   CSS properties use hyphenated names and colon to assign values, ending with semicolon.

2. Step 2: Check each option

   line-height: 1.5; uses correct CSS syntax: line-height: 1.5;. Options B and C use incorrect assignment or units, D uses camelCase which is invalid in CSS.

3. Final Answer:

   line-height: 1.5; -> Option B

4. Quick Check:

   CSS property syntax = property: value; [OK]

Hint: CSS uses hyphen and colon, no equals sign [OK]

Common Mistakes:

• Using equals sign instead of colon
• Adding units like px to unitless line height
• Using camelCase instead of hyphen

3. Given this CSS:

p { font-size: 16px; line-height: 2; }

What is the computed line height in pixels for the paragraph text?

medium

A. 16px

B. 2px

C. 32px

D. 8px

Solution

1. Step 1: Understand line-height as a multiplier

   When line-height is a number (like 2), it multiplies the font size to get the line height in pixels.

2. Step 2: Calculate line height

   Font size is 16px, line-height is 2, so 16px x 2 = 32px.

3. Final Answer:

   32px -> Option C

4. Quick Check:

   Line height = font size x number [OK]

Hint: Multiply font size by line-height number [OK]

Common Mistakes:

• Confusing line-height number as pixels directly
• Using line-height value as font size
• Ignoring multiplication and picking wrong units

4. This CSS code is intended to increase line spacing but does not work as expected:

p { line-height: 20; }

What is the error?

medium

A. Missing units like 'px' for line-height value

B. line-height cannot be set on paragraphs

C. line-height value must be less than 1

D. line-height property name is misspelled

Solution

1. Step 1: Check line-height value type

   The value 20 without units is treated as a multiplier, but 20 is unusually large and likely intended as pixels.

2. Step 2: Identify missing units

   To specify exact pixel spacing, units like 'px' are required: line-height: 20px;. Without units, 20 means 20 times font size, which is huge and may cause unexpected layout.

3. Final Answer:

   Missing units like 'px' for line-height value -> Option A

4. Quick Check:

   Units needed for absolute line height values [OK]

Hint: Add units like px for fixed line height values [OK]

Common Mistakes:

• Using large numbers without units expecting pixels
• Thinking line-height can't be set on paragraphs
• Misspelling property name

5. You want to create a responsive paragraph where line height adjusts nicely with font size for readability. Which CSS rule achieves this best?

hard

A. p { font-size: 16px; line-height: 1.5rem; }

B. p { font-size: 16px; line-height: 24px; }

C. p { font-size: 1.2rem; line-height: 24px; }

D. p { font-size: 1.2rem; line-height: 1.5; }

Solution

1. Step 1: Understand responsive units

   Using rem units for font size scales text with root font size, good for responsiveness.

2. Step 2: Use unitless line-height for flexibility

   Setting line-height: 1.5; as a number scales line height relative to font size, adapting well on different devices.

3. Step 3: Compare options

   p { font-size: 1.2rem; line-height: 1.5; } uses rem for font size and unitless line-height, making it flexible. Options B and C fix line height in pixels, less flexible. p { font-size: 16px; line-height: 1.5rem; } mixes units incorrectly.

4. Final Answer:

   p { font-size: 1.2rem; line-height: 1.5; } -> Option D

5. Quick Check:

   Unitless line-height + rem font size = responsive text [OK]

Hint: Use unitless line-height with rem font size for responsiveness [OK]

Common Mistakes:

• Using fixed pixel line height with scalable font size
• Mixing units in line-height property
• Not using unitless line-height for flexible spacing