Column spanning in Tailwind - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ layout

intermediate

What is the visual layout of this grid with column spanning?

Consider a 3-column grid where the first item spans 2 columns. What will the layout look like?

Tailwind

<div class="grid grid-cols-3 gap-4">
  <div class="col-span-2 bg-blue-500 text-white p-4">Item 1</div>
  <div class="bg-green-500 text-white p-4">Item 2</div>
  <div class="bg-red-500 text-white p-4">Item 3</div>
</div>

A Item 1 takes first two columns in the first row; Item 2 is in the third column of the first row; Item 3 is below Item 1 in the second row, first column.

B Item 1 takes all three columns in the first row; Item 2 and Item 3 are side by side in the second row.

C Item 1 takes first two columns in the first row; Item 2 is below Item 1 in the second row, first column; Item 3 is below Item 2 in the third row, first column.

D Item 1 takes first two columns in the first row; Item 2 is in the third column of the first row; Item 3 is below Item 2 in the second row, third column.

💡 Hint

Remember that grid items fill rows left to right, top to bottom, and spanning columns affects placement of following items.

The first item spans 2 columns in the first row, so it occupies columns 1 and 2. The second item fills the remaining third column in the first row. The third item moves to the next row and occupies the first column there.

❓ selector

intermediate

Which Tailwind class makes an element span 3 columns in a grid?

You want a grid item to cover exactly 3 columns. Which class should you use?

A col-span-full

B col-start-3

C col-end-3

D col-span-3

💡 Hint

The class name for spanning columns starts with 'col-span-' followed by the number of columns to span.

col-span-3 tells the grid item to span 3 columns. col-start-3 and col-end-3 control where the item starts or ends, not how many columns it spans. col-span-full spans all columns, which may not be exactly 3.

🧠 Conceptual

advanced

What happens if a grid item spans more columns than the grid has?

If a grid has 4 columns and an item uses col-span-6, what will happen?

A The item will overflow outside the grid container.

B The item will cause a layout error and not render.

C The item will span all 4 columns, ignoring the extra span.

D The item will automatically wrap to the next row.

💡 Hint

Think about how CSS grid handles spans larger than the grid size.

When a grid item tries to span more columns than exist, it will span all available columns without causing errors or overflow. It does not wrap automatically.

❓ accessibility

advanced

How does column spanning affect keyboard navigation in grids?

If a grid item spans multiple columns, what should you consider for keyboard users?

A Use tabindex="-1" on the spanning item to prevent focus.

B Ensure the item has a clear focus style and logical tab order despite spanning columns.

C Remove the item from tab order because spanning confuses keyboard users.

D Add aria-hidden="true" to the spanning item to skip it in navigation.

💡 Hint

Think about how users navigate with keyboard and how focus moves in grids.

Spanning columns does not remove the need for keyboard accessibility. The item should remain focusable with a visible focus style and the tab order should follow the visual layout logically.

❓ rendering

expert

What is the rendered width of a grid item with col-span-2 in a 4-column grid with 1rem gap?

Given a grid container 40rem wide with 4 equal columns and 1rem gap between columns, what is the width of an item with col-span-2?

A 19.5rem

B 20rem

C 18.5rem

D 21rem

💡 Hint

Calculate total gaps width, subtract from container width, then divide by columns and multiply by span count.

The total gap width is 3 gaps × 1rem = 3rem. The remaining width for columns is 40rem - 3rem = 37rem. Each column is 37rem ÷ 4 = 9.25rem. Spanning 2 columns means 9.25rem × 2 = 18.5rem plus 1 gap (1rem) between the two columns, so total width is 18.5rem + 1rem = 19.5rem.

Practice

1. What does the Tailwind class col-span-3 do in a grid layout?

easy

A. Creates 3 columns inside the element

B. Adds 3 columns to the grid container

C. Makes the element span across 3 columns in the grid

D. Sets the element width to 3rem

Solution

1. Step 1: Understand the role of col-span-{n}

   The class col-span-3 tells the element to cover 3 columns in the grid layout.

2. Step 2: Differentiate from other grid classes

   It does not create columns or set width; it only controls how many columns the element spans.

3. Final Answer:

   Makes the element span across 3 columns in the grid -> Option C

4. Quick Check:

   col-span-3 = span 3 columns [OK]

Hint: Remember col-span controls how many columns an item covers [OK]

Common Mistakes:

• Confusing col-span with grid-cols which sets columns on container
• Thinking col-span creates columns inside the element
• Assuming col-span sets fixed width in rem or px

2. Which of the following is the correct way to make a grid container with 4 columns and an item that spans 2 columns in Tailwind?

easy

A. Item

B. Item

C. Item

D. Item

Solution

1. Step 1: Set up the grid container with 4 columns

   The class grid-cols-4 inside a grid container creates 4 columns.

2. Step 2: Make the item span 2 columns

   The class col-span-2 on the item makes it cover 2 columns.

3. Final Answer:

   <div class='grid grid-cols-4'><div class='col-span-2'>Item</div></div> -> Option B

4. Quick Check:

   grid-cols-4 + col-span-2 = correct syntax [OK]

Hint: Use grid-cols on container, col-span on item [OK]

Common Mistakes:

• Swapping order of grid and grid-cols classes
• Using incorrect class like span-col-2 instead of col-span-2
• Setting col-span larger than grid-cols

3. Given this code snippet, what will be the visual layout of the grid items?

<div class='grid grid-cols-3 gap-4'>
  <div class='col-span-2 bg-blue-300'>A</div>
  <div class='bg-red-300'>B</div>
  <div class='bg-green-300'>C</div>
</div>

medium

A. Item A spans 2 columns in the first row, B occupies the third column in the first row, C starts a new row

B. Items A, B, and C all appear in the first row, each spanning one column

C. Item A spans 3 columns, B and C are below in separate rows

D. Item A spans 2 rows, B and C are side by side in the first row

Solution

1. Step 1: Analyze grid container and columns

   The container has 3 columns with gaps. Item A spans 2 columns, so it fills columns 1 and 2 in the first row.

2. Step 2: Position of items B and C

   Item B fills the remaining 1 column in the first row (column 3). Item C moves to the next row occupying the first column.

3. Final Answer:

   Item A spans 2 columns in the first row, B occupies the third column in the first row, C starts a new row -> Option A

4. Quick Check:

   col-span-2 + grid-cols-3 layout = Item A spans 2 columns in the first row, B occupies the third column in the first row, C starts a new row [OK]

Hint: Count columns and span to place items visually [OK]

Common Mistakes:

• Assuming all items fit in one row regardless of span
• Thinking col-span affects rows instead of columns
• Ignoring grid gaps affecting spacing

4. Identify the error in this Tailwind grid code:

<div class='grid grid-cols-3'>
  <div class='col-span-4 bg-yellow-200'>Item 1</div>
  <div>Item 2</div>
</div>

medium

A. col-span-4 is invalid because the grid has only 3 columns

B. Missing gap class for spacing between columns

C. The grid container is missing the grid class

D. The second div should also have a col-span class

Solution

1. Step 1: Check grid container columns

   The container has 3 columns defined by grid-cols-3.

2. Step 2: Validate col-span value

   The item uses col-span-4, which tries to span 4 columns, exceeding the 3 columns available.

3. Final Answer:

   col-span-4 is invalid because the grid has only 3 columns -> Option A

4. Quick Check:

   col-span cannot exceed grid-cols [OK]

Hint: col-span must be ≤ grid-cols count [OK]

Common Mistakes:

• Ignoring that col-span cannot be larger than grid-cols
• Thinking missing gap causes layout error
• Assuming grid class is missing when it is present

5. You want to create a responsive grid where an item spans 4 columns on large screens but only 2 columns on small screens. Which Tailwind classes achieve this?

hard

A. grid grid-cols-6 col-span-2 sm:col-span-4

B. grid grid-cols-4 col-span-4 sm:col-span-2

C. grid grid-cols-6 col-span-4 sm:col-span-2

D. grid grid-cols-6 col-span-2 lg:col-span-4

Solution

1. Step 1: Define grid with enough columns

   Using grid-cols-6 gives 6 columns, enough for spanning 4 columns on large screens.

2. Step 2: Set default and large screen spans

   col-span-2 applies by default (small screens). lg:col-span-4 overrides on large screens to span 4 columns.

3. Final Answer:

   grid grid-cols-6 col-span-2 lg:col-span-4 -> Option D

4. Quick Check:

   Responsive col-span with lg: prefix = grid grid-cols-6 col-span-2 lg:col-span-4 [OK]

Hint: Use responsive prefixes like lg: for different spans [OK]

Common Mistakes:

• Using sm: prefix for large screen changes
• Setting col-span larger than grid-cols
• Not defining enough columns in grid-cols