Table accessibility basics in HTML - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why use in tables?

What is the main purpose of the element in an HTML table for accessibility?

A To provide a visible title or description for the table that screen readers announce.

B To add a footer note at the bottom of the table.

C To create a clickable link inside the table header.

D To style the table with colors and borders.

💡 Hint

Think about how screen readers understand what a table is about.

The element gives a clear, descriptive title for the table. Screen readers use it to announce the table's purpose, helping users understand the content quickly.

📝 Syntax

intermediate

Correct use of for headers

Which option correctly marks the first row as header cells in a table for accessibility?

HTML

<table>
  <tr>
    <td>Product</td>
    <td>Price</td>
  </tr>
  <tr>
    <td>Apple</td>
    <td>$1</td>
  </tr>
</table>

A

<table>
  <thead>
    <tr>
      <td>Product</td>
      <td>Price</td>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Apple</td>
      <td>$1</td>
    </tr>
  </tbody>
</table>

B

<table>
  <tr>
    <td>Product</td>
    <td>Price</td>
  </tr>
  <tr>
    <th>Apple</th>
    <th>$1</th>
  </tr>
</table>

C

<table>
  <tr>
    <th>Product</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>Apple</td>
    <td>$1</td>
  </tr>
</table>

D

<table>
  <thead>
    <tr>
      <th>Product</th>
      <td>Price</td>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Apple</td>
      <td>$1</td>
    </tr>
  </tbody>
</table>

💡 Hint

Headers should use the tag, not .

The first row cells should be to mark them as headers. This helps screen readers identify column headers.

❓ selector

advanced

Selecting header cells for row headers

Which CSS selector correctly styles all row header cells in a table for accessibility?

A table td[scope="row"] { font-weight: bold; }

B table td[scope="col"] { font-weight: bold; }

C table th[scope="col"] { font-weight: bold; }

D table th[scope="row"] { font-weight: bold; }

💡 Hint

Row headers use with a specific scope attribute.

Row headers are marked with <th scope="row">. Styling these helps visually distinguish row headers.

❓ layout

advanced

Responsive table design for accessibility

Which CSS approach best helps make a wide table accessible on small screens?

A Use overflow-x: auto on a container around the table to allow horizontal scrolling.

B Hide some columns with display: none to fit the screen.

C Set table width to 100% and use fixed column widths with px units.

D Use float: left on table cells to stack them vertically.

💡 Hint

Think about preserving all data while allowing easy navigation on small screens.

Wrapping the table in a container with overflow-x: auto lets users scroll horizontally, preserving all content and accessibility.

❓ accessibility

expert

Using ARIA roles for complex tables

In a complex data table with merged cells, which ARIA role helps assistive technologies understand the table structure best?

A role="presentation" on the table element

B role="grid" on the table element

C role="button" on the table element

D role="list" on the table element

💡 Hint

This role treats the table like a grid of cells with keyboard navigation support.

The role="grid" indicates a complex interactive table, helping screen readers and keyboard users navigate merged cells properly.

Practice

1. What is the main purpose of the <caption> element in an HTML table?

easy

A. To add a footer row at the bottom of the table.

B. To provide a title or description for the table, improving accessibility.

C. To create a header cell for each column.

D. To style the table with colors and fonts.

Solution

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

   The <caption> element is used to give a title or description to a table, which helps screen readers and users understand the table's content.

2. Step 2: Compare with other options

   Options B, C, and D describe other table parts or styling, but only <caption> provides a descriptive title.

3. Final Answer:

   To provide a title or description for the table, improving accessibility. -> Option B

4. Quick Check:

   <caption> = Table title [OK]

Hint: Caption tags give tables a clear title for screen readers [OK]

Common Mistakes:

• Confusing <caption> with <tfoot> or <thead>
• Thinking <caption> styles the table
• Ignoring accessibility benefits of <caption>

2. Which of the following is the correct way to mark a header cell for a column in an HTML table?

easy

A. <td scope="col">Header</td>

B. <td>Header</td>

C. <th scope="row">Header</th>

D. <th scope="col">Header</th>

Solution

1. Step 1: Identify the correct element for header cells

   The <th> element is used for header cells, not <td>.

2. Step 2: Understand the scope attribute

   For column headers, scope="col" is correct. <th scope="col">Header</th> uses <th scope="col">, which is the proper syntax.

3. Final Answer:

   <th scope="col">Header</th> -> Option D

4. Quick Check:

   <th scope="col"> = Column header [OK]

Hint: Use <th> with scope="col" for column headers [OK]

Common Mistakes:

• Using <td> instead of <th> for headers
• Mixing scope="row" with column headers
• Omitting the scope attribute

3. Given the following table snippet, what will screen readers associate the header "Name" with?

<table>
  <caption>User List</caption>
  <thead>
    <tr>
      <th scope="col">Name</th>
      <th scope="col">Age</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Alice</td>
      <td>30</td>
    </tr>
  </tbody>
</table>

medium

A. The header "Name" is linked to the first column cells like "Alice".

B. The header "Name" is linked to the first row cells like "Alice" and "30".

C. The header "Name" is ignored by screen readers because it lacks an id.

D. The header "Name" is linked to the entire table caption.

Solution

1. Step 1: Understand scope="col" usage

   The scope="col" attribute on the <th> means the header applies to the entire column below it.

2. Step 2: Identify which cells belong to the "Name" column

   The first column cells, such as "Alice", are associated with the "Name" header for screen readers.

3. Final Answer:

   The header "Name" is linked to the first column cells like "Alice". -> Option A

4. Quick Check:

   scope="col" links header to column cells [OK]

Hint: scope="col" links header to column cells below [OK]

Common Mistakes:

• Confusing row and column scope
• Thinking headers need id attributes to link
• Assuming caption links headers

4. What is wrong with this table snippet regarding accessibility?

<table>
  <tr>
    <td>Product</td>
    <td>Price</td>
  </tr>
  <tr>
    <td>Book</td>
    <td>$10</td>
  </tr>
</table>

medium

A. The table is missing <caption> for description.

B. The header cells use <td> instead of <th>.

C. All of the above.

D. The scope attribute is missing on header cells.

Solution

1. Step 1: Check for caption element

   The table lacks a <caption>, which helps describe the table for screen readers.

2. Step 2: Check header cell tags and attributes

   The first row uses <td> instead of <th> for headers, and no scope attributes are present.

3. Final Answer:

   All of the above. -> Option C

4. Quick Check:

   Missing caption, wrong header tags, and no scope = C [OK]

Hint: Headers need <th> with scope and caption for full accessibility [OK]

Common Mistakes:

• Using <td> for headers
• Skipping caption element
• Not adding scope attribute to headers

5. You want to create an accessible table showing students and their scores. Which combination of elements and attributes is best practice?

hard

A. Use <caption> for the title, <th scope="col"> for column headers, and <th scope="row"> for row headers.

B. Use <caption> for the title, <td> for all cells, and no scope attributes.

C. Use <thead> with <td> for headers and <tbody> for data rows.

D. Use <caption> for the title and aria-label on each <td> cell.

Solution

1. Step 1: Use <caption> for table description

   This helps all users understand the table's purpose.

2. Step 2: Use <th> with proper scope for headers

   Column headers get scope="col", row headers get scope="row". This clarifies relationships for screen readers.

3. Final Answer:

   Use <caption> for the title, <th scope="col"> for column headers, and <th scope="row"> for row headers. -> Option A

4. Quick Check:

   Caption + th with scope col/row = best accessibility [OK]

Hint: Caption plus <th> with scope="col" and scope="row" is best [OK]

Common Mistakes:

• Using <td> for headers
• Skipping scope attributes
• Relying only on aria-labels on data cells