Table headers in HTML - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the purpose of the element in an HTML table?

Choose the best description of the element's role in a table.

A It styles the table rows with alternating colors.

B It defines the footer section of a table.

C It creates a separate table inside the main table.

D It groups the header content in a table, usually containing <th> elements.

💡 Hint

Think about which part of the table usually contains column titles.

The element groups the header rows of a table, typically containing cells that describe each column.

📝 Syntax

intermediate

Which HTML snippet correctly defines a table header cell?

Select the option that uses the correct tag for a table header cell.

A <th>Header</th>

B <header>Header</header>

C <td>Header</td>

D <head>Header</head>

💡 Hint

Table header cells use a special tag different from normal cells.

The tag defines a header cell in a table, which is usually bold and centered by default.

❓ rendering

advanced

What will the browser display for this table snippet?

Given the HTML below, what is the visual output in the browser?

HTML

<table>
  <thead>
    <tr><th>Name</th><th>Age</th></tr>
  </thead>
  <tbody>
    <tr><td>Alice</td><td>30</td></tr>
    <tr><td>Bob</td><td>25</td></tr>
  </tbody>
</table>

A A table with two columns labeled 'Name' and 'Age' in bold at the top, and two rows with Alice/30 and Bob/25 below.

B A table with no headers, just two rows showing Alice/30 and Bob/25.

C A table with 'Name' and 'Age' as normal cells, not bold or centered.

D An error message because <thead> is not allowed inside <table>.

💡 Hint

Headers inside usually appear bold and centered.

The groups header rows, and cells are bold and centered by default, so the top row shows 'Name' and 'Age' as headers.

❓ selector

advanced

Which CSS selector targets only table header cells inside the table header section?

Choose the CSS selector that styles only elements inside .

A table tbody th

B table thead th

C table th

D thead td

💡 Hint

Think about selecting inside the specifically.

The selector 'table thead th' targets all elements inside the of a table.

❓ accessibility

expert

Which attribute improves accessibility by associating a table header with its data cells?

Select the attribute that links a header cell to its related cells for screen readers.

A alt

B aria-label

C scope

D title

💡 Hint

This attribute defines if the header is for a row, column, or group.

The 'scope' attribute on elements specifies whether the header applies to a row, column, or group, helping screen readers understand the table structure.

Practice

1. What is the main purpose of the <th> tag in an HTML table?

easy

A. To define a header cell that labels a column or row

B. To create a normal data cell in a table

C. To add a caption above the table

D. To merge multiple cells into one

Solution

1. Step 1: Understand the role of <th>

   The <th> tag is used to create header cells in a table, which label columns or rows.

2. Step 2: Differentiate from other tags

   The <td> tag creates normal data cells, not headers. Captions use <caption>, and merging cells uses colspan or rowspan.

3. Final Answer:

   To define a header cell that labels a column or row -> Option A

4. Quick Check:

   Table headers = <th> tag [OK]

Hint: Headers label columns or rows using <th> tags [OK]

Common Mistakes:

• Confusing <th> with <td>
• Thinking <th> merges cells
• Using <caption> as header cells

2. Which of the following is the correct syntax to create a table header cell for a column named "Name"?

easy

A. Name

B. Name

C. Name

D. Name

Solution

1. Step 1: Identify the tag for header cells

   The correct tag for a table header cell is <th>.

2. Step 2: Check the options

   <td> is for data cells, <header> is a page section tag, and <thead> groups header rows but does not create individual cells.

3. Final Answer:

   <th>Name</th> -> Option D

4. Quick Check:

   Header cell = <th> [OK]

Hint: Use <th> for header cells, not <td> or <header> [OK]

Common Mistakes:

• Using <td> instead of <th>
• Confusing <thead> with <th>
• Using non-table tags like <header>

3. Given the following HTML snippet, what will be the visual effect of the <th> elements in most browsers?

<table>
  <thead>
    <tr>
      <th>ID</th>
      <th>Name</th>
      <th>Age</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>1</td>
      <td>Alice</td>
      <td>30</td>
    </tr>
  </tbody>
</table>

medium

A. The header cells will look the same as data cells

B. The header cells will be italic and left-aligned

C. The header cells will be bold and centered by default

D. The header cells will be hidden from view

Solution

1. Step 1: Understand default browser styles for <th>

   Browsers typically render <th> cells with bold text and center alignment to distinguish headers.

2. Step 2: Compare with data cells

   Data cells (<td>) are usually normal weight and left-aligned by default.

3. Final Answer:

   The header cells will be bold and centered by default -> Option C

4. Quick Check:

   <th> = bold + center [OK]

Hint: Headers appear bold and centered by default [OK]

Common Mistakes:

• Thinking headers are italic
• Assuming headers look like data cells
• Believing headers are hidden

4. Identify the error in this table header code:

<table>
  <thead>
    <tr>
      <th>Product</td>
      <th>Price</th>
    </tr>
  </thead>
</table>

medium

A. The second header cell uses <th> instead of <td>

B. The first header cell closes with </td> instead of </th>

C. The <tr> tag is not closed

D. The <thead> tag is missing

Solution

1. Step 1: Check tag consistency in header cells

   The first header cell starts with <th> but incorrectly closes with </td>, which is invalid.

2. Step 2: Verify other tags

   The <thead> and <tr> tags are correctly used and closed. The second header cell uses <th> correctly.

3. Final Answer:

   The first header cell closes with </td> instead of </th> -> Option B

4. Quick Check:

   Matching tags for <th> = </th> [OK]

Hint: Match opening and closing tags exactly for <th> [OK]

Common Mistakes:

• Mixing <th> and <td> tags
• Forgetting to close <tr> or <thead>
• Using <td> inside <thead>

5. You want to create a table where the first column uses header cells to label each row, and the top row uses header cells to label each column. Which is the correct way to do this?

hard

A. Col1Col2Row1Data1Data2

B. Col1Col2Row1Data1Data2

C. Col1Col2Row1Data1Data2

D. Col1Col2Row1Data1Data2

Solution

1. Step 1: Use <th> for both column and row headers

   The top row headers and the first column headers should use <th> tags to indicate headers.

2. Step 2: Check the provided options

   Col1Col2Row1Data1Data2 correctly uses <th> in the top row and first column. The empty <th> in the top-left corner aligns headers properly.

3. Final Answer:

   Option A uses <th> for both row and column headers correctly -> Option A

4. Quick Check:

   Row and column headers = <th> tags [OK]

Hint: Use <th> for headers in both top row and first column [OK]

Common Mistakes:

• Using <td> for headers in the first column
• Leaving top-left cell empty without <th>
• Mixing <td> and <th> incorrectly