Overflow property in CSS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to hide content that overflows the box.

CSS

div {
  width: 10rem;
  height: 5rem;
  overflow: [1];
  border: 1px solid black;
}

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

Ahidden

Bvisible

Cscroll

Dauto

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'visible' which shows overflow content.

Using 'scroll' which adds scrollbars instead of hiding.

The hidden value hides any content that goes outside the box.

2fill in blank

medium

Complete the code to add scrollbars only when needed.

CSS

div {
  width: 12rem;
  height: 6rem;
  overflow: [1];
  border: 1px solid gray;
}

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

Ahidden

Bauto

Cvisible

Dscroll

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'scroll' which always shows scrollbars.

Using 'hidden' which hides overflow without scrollbars.

The auto value adds scrollbars only if content is too big.

3fill in blank

hard

Fix the error in the code to make overflow content scrollable.

CSS

section {
  width: 15rem;
  height: 7rem;
  overflow: [1];
  border: 2px solid blue;
}

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

Ahidden

Bvisible

Cscroll

Dnone

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'hidden' which hides overflow content.

Using 'visible' which shows overflow outside the box.

The scroll value always shows scrollbars to access overflow content.

4fill in blank

hard

Fill both blanks to create a box that clips overflow and adds vertical scroll only.

CSS

div {
  width: 14rem;
  height: 8rem;
  overflow-x: [1];
  overflow-y: [2];
  border: 1px solid black;
}

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

Ahidden

Bscroll

Cvisible

Dauto

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'visible' for overflow-x which shows overflow.

Using 'auto' for overflow-y which shows scrollbars only if needed.

Setting overflow-x to hidden clips horizontal overflow.
Setting overflow-y to scroll always shows vertical scrollbars.

5fill in blank

hard

Fill all three blanks to create a scrollable box with clipped horizontal overflow and automatic vertical scroll.

CSS

section {
  width: 16rem;
  height: 9rem;
  overflow: [1];
  overflow-x: [2];
  overflow-y: [3];
  border: 2px solid green;
}

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

Avisible

Bauto

Chidden

Dscroll

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'scroll' for overflow-x which shows horizontal scrollbars.

Using 'hidden' for overflow-y which hides vertical overflow.

Set overflow-x to hidden to clip horizontal overflow.
Set overflow-y to auto to add vertical scrollbars only if needed.
Setting overflow to visible is overridden by the axis-specific properties but included here for completeness.

Practice

1. What does the CSS overflow property control in a webpage layout?

easy

A. How extra content inside a box is shown or hidden

B. The color of the text inside a box

C. The size of the box border

D. The font style of the text

Solution

1. Step 1: Understand the role of overflow

   The overflow property manages what happens when content is bigger than its container.

2. Step 2: Match property to behavior

   It controls if extra content is visible, hidden, or scrollable inside the box.

3. Final Answer:

   How extra content inside a box is shown or hidden -> Option A

4. Quick Check:

   Overflow controls extra content display [OK]

Hint: Overflow controls extra content visibility inside boxes [OK]

Common Mistakes:

• Confusing overflow with text color or font
• Thinking overflow changes box size
• Mixing overflow with border styles

2. Which of the following is the correct CSS syntax to hide overflow content inside a box?

easy

A. overflow = hidden;

B. overflow: hidden;

C. overflow; hidden;

D. overflow-hidden;

Solution

1. Step 1: Recall CSS property syntax

   CSS uses property: value; format to set styles.

2. Step 2: Identify correct syntax for overflow hidden

   The correct way is overflow: hidden; with colon and semicolon.

3. Final Answer:

   overflow: hidden; -> Option B

4. Quick Check:

   CSS uses colon between property and value [OK]

Hint: Remember CSS uses colon between property and value [OK]

Common Mistakes:

• Using equals sign instead of colon
• Missing colon or semicolon
• Combining property and value without separator

3. Given this CSS and HTML, what will you see in the browser?

<style>
.box {
  width: 100px;
  height: 50px;
  overflow: scroll;
  border: 1px solid black;
}
</style>
<div class='box'>This is a very long text that will not fit inside the box.</div>

medium

A. The text is cut off and hidden without scrollbars

B. The text is fully visible without scrollbars

C. The box shows scrollbars to see hidden text

D. The box expands to fit all text

Solution

1. Step 1: Analyze box size and overflow setting

   The box is fixed at 100px by 50px with overflow: scroll;.

2. Step 2: Understand overflow: scroll behavior

   This forces scrollbars to appear so user can scroll to see all content.

3. Final Answer:

   The box shows scrollbars to see hidden text -> Option C

4. Quick Check:

   Overflow scroll adds scrollbars [OK]

Hint: Overflow scroll always shows scrollbars [OK]

Common Mistakes:

• Thinking overflow scroll hides content
• Assuming box grows to fit text
• Confusing scroll with auto behavior

4. You want to hide extra content inside a fixed-size box but your CSS uses overflow: visible;. What is the problem and how to fix it?

medium

A. Visible overflow hides content; change to scroll to show scrollbars

B. Visible overflow makes box invisible; use auto instead

C. Visible overflow causes syntax error; fix by adding semicolon

D. Visible overflow shows extra content; change to hidden to hide it

Solution

1. Step 1: Understand overflow: visible behavior

   Overflow visible means extra content spills outside the box and is shown.

2. Step 2: Fix by changing overflow to hidden

   To hide extra content, use overflow: hidden; which clips content inside the box.

3. Final Answer:

   Visible overflow shows extra content; change to hidden to hide it -> Option D

4. Quick Check:

   Visible shows overflow, hidden hides it [OK]

Hint: Visible shows overflow; hidden hides it [OK]

Common Mistakes:

• Thinking visible hides content
• Confusing visible with scroll or auto
• Assuming visible causes errors

5. You have a container with dynamic content that sometimes fits and sometimes overflows. You want scrollbars only when needed. Which overflow value should you use and why?

hard

A. overflow: auto; because it shows scrollbars only when content overflows

B. overflow: visible; because it always shows all content

C. overflow: hidden; because it hides all overflow content

D. overflow: scroll; because it never shows scrollbars

Solution

1. Step 1: Understand dynamic content overflow needs

   Content size changes, so scrollbars should appear only if needed.

2. Step 2: Choose overflow: auto for conditional scrollbars

   auto adds scrollbars only when content is too big, keeping layout clean otherwise.

3. Final Answer:

   overflow: auto; because it shows scrollbars only when content overflows -> Option A

4. Quick Check:

   Auto adds scrollbars only if needed [OK]

Hint: Use overflow auto for scrollbars only when needed [OK]

Common Mistakes:

• Using scroll which always shows scrollbars
• Using visible which never hides overflow
• Using hidden which hides overflow without scroll