Flex direction in CSS - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding flex-direction property

What is the default value of the flex-direction property in a flex container?

A column-reverse

B column

C row-reverse

D row

💡 Hint

Think about how items are laid out horizontally by default.

The default flex-direction is row, which arranges flex items horizontally from left to right.

📝 Syntax

intermediate

CSS syntax for flex-direction

Which of the following CSS snippets correctly sets the flex container to arrange items vertically from top to bottom?

CSS

div.container {
  display: flex;
  /* flex-direction here */
}

A flex-direction: row-reverse;

B flex-direction: column;

C flex-direction: column-reverse;

D flex-direction: vertical;

💡 Hint

The property value should mean vertical stacking from top to bottom.

The value column arranges flex items vertically from top to bottom.

❓ rendering

advanced

Visual output of flex-direction: row-reverse

Given the following HTML and CSS, what will be the order of the items displayed in the browser?

CSS

<style>
.container {
  display: flex;
  flex-direction: row-reverse;
  gap: 1rem;
}
</style>
<div class="container">
  <div>Item 1</div>
  <div>Item 2</div>
  <div>Item 3</div>
</div>

A Item 3, Item 2, Item 1 (left to right)

B Item 1, Item 2, Item 3 (left to right)

C Item 1, Item 3, Item 2 (left to right)

D Item 2, Item 1, Item 3 (left to right)

💡 Hint

row-reverse reverses the horizontal order of items.

With flex-direction: row-reverse, items are laid out horizontally but in reverse order, so Item 3 appears first on the left.

❓ selector

advanced

Selecting flex container for vertical layout

Which CSS selector and property combination correctly targets a flex container with class menu and sets its items vertically from bottom to top?

A .menu { display: flex; flex-direction: column; }

B #menu { display: flex; flex-direction: row-reverse; }

C .menu { display: flex; flex-direction: column-reverse; }

D .menu { display: block; flex-direction: column-reverse; }

💡 Hint

Look for the correct selector and the property value that reverses vertical order.

The selector '.menu' targets elements with class 'menu'. The value 'column-reverse' arranges items vertically from bottom to top.

❓ accessibility

expert

Accessibility impact of flex-direction changes

When using flex-direction: row-reverse; on a navigation menu, what accessibility consideration should you keep in mind?

A Screen readers may read the menu items in the original HTML order, not the visual reversed order.

B Keyboard navigation order automatically reverses to match the visual order.

C Color contrast is affected by flex-direction changes.

D Flex-direction changes disable ARIA roles on the container.

💡 Hint

Think about how assistive technologies read content compared to visual layout.

Screen readers follow the HTML source order, so reversing visual order with flex-direction does not change reading order, which can confuse users.

Practice

1. What does the CSS property flex-direction control in a flex container?

easy

A. The direction in which flex items are laid out (row or column)

B. The color of flex items

C. The size of the flex container

D. The font style of flex items

Solution

1. Step 1: Understand the role of flex-direction

   The flex-direction property sets the main axis direction for flex items inside a flex container.

2. Step 2: Identify what flex-direction affects

   It controls whether items are laid out in a row (horizontally) or column (vertically), and if the order is normal or reversed.

3. Final Answer:

   The direction in which flex items are laid out (row or column) -> Option A

4. Quick Check:

   flex-direction controls layout direction [OK]

Hint: Remember: flex-direction sets row or column layout [OK]

Common Mistakes:

• Confusing flex-direction with color or size properties
• Thinking flex-direction changes container size
• Assuming flex-direction affects font styles

2. Which of the following is the correct syntax to set flex items in a column direction?

easy

A. display: flex; flex-direction: row-column;

B. display: flex; direction: column;

C. display: block; flex-direction: column;

D. display: flex; flex-direction: column;

Solution

1. Step 1: Check the container display property

   Flexbox requires display: flex; on the container to work.

2. Step 2: Verify the flex-direction syntax

   The correct property is flex-direction with values like row or column. The value column is valid.

3. Final Answer:

   display: flex; flex-direction: column; -> Option D

4. Quick Check:

   Use display flex + flex-direction column [OK]

Hint: Always use display:flex before flex-direction [OK]

Common Mistakes:

• Using invalid values like 'row-column'
• Forgetting display:flex on container
• Using 'direction' instead of 'flex-direction'

3. Given this CSS:

div.container {
  display: flex;
  flex-direction: row-reverse;
}

What will be the order of flex items inside div.container?

medium

A. Items will be stacked vertically in normal order

B. Items will be laid out from left to right in normal order

C. Items will be laid out from right to left in reverse order

D. Items will be stacked vertically in reverse order

Solution

1. Step 1: Identify flex-direction value

   The value row-reverse means items are placed in a row but in reverse order, starting from the right.

2. Step 2: Understand layout direction

   Flex items will appear horizontally but reversed, so the last item appears first on the right side.

3. Final Answer:

   Items will be laid out from right to left in reverse order -> Option C

4. Quick Check:

   row-reverse means horizontal reversed layout [OK]

Hint: row-reverse flips horizontal order right to left [OK]

Common Mistakes:

• Confusing row-reverse with column direction
• Assuming normal left-to-right order
• Thinking items stack vertically

4. This CSS code does not change the layout direction as expected. What is the error?

.box {
  flex-direction: column;
}

medium

A. Missing display: flex; on the container

B. Incorrect property name, should be flex-direction-row

C. Value column is invalid

D. Flex-direction only works on inline elements

Solution

1. Step 1: Check if flex container is set

   The property flex-direction only works if the container has display: flex;.

2. Step 2: Identify missing display property

   The code does not include display: flex;, so the layout direction won't change.

3. Final Answer:

   Missing display: flex; on the container -> Option A

4. Quick Check:

   flex-direction needs display:flex [OK]

Hint: Always set display:flex before flex-direction [OK]

Common Mistakes:

• Forgetting to set display:flex
• Using wrong property names
• Thinking flex-direction works on inline elements

5. You want a flex container to display items vertically but with the last item shown at the top. Which CSS flex-direction value should you use?

hard

A. column

B. column-reverse

C. row-reverse

D. row

Solution

1. Step 1: Understand vertical layout

   To display items vertically, use column or column-reverse.

2. Step 2: Reverse order with last item on top

   The column-reverse value stacks items vertically but reverses their order, so the last item appears at the top.

3. Final Answer:

   column-reverse -> Option B

4. Quick Check:

   column-reverse stacks vertically reversed [OK]

Hint: Use column-reverse for vertical reversed order [OK]

Common Mistakes:

• Choosing row-reverse which is horizontal
• Using column without reverse order
• Confusing row and column directions