Textarea in HTML - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ rendering

intermediate

What will the textarea display initially?

Consider this HTML code:

<textarea>Hello
World!</textarea>

What text will appear inside the textarea when viewed in a browser?

HTML

<textarea>Hello
World!</textarea>

A

Hello
World!

B Hello\nWorld!

C Hello World!

D

!dlroW
olleH

💡 Hint

Remember that inside HTML, new lines inside textarea are rendered as line breaks.

The textarea preserves line breaks inside its content. The \n inside the HTML source is interpreted as a new line, so the text appears on two lines: 'Hello' on the first line and 'World!' on the second.

📝 Syntax

intermediate

Which textarea attribute controls the visible width?

You want to set the visible width of a textarea to 40 characters. Which attribute should you use?

A width="40"

B cols="40"

C size="40"

D length="40"

💡 Hint

Think about the standard HTML attribute for textarea width in characters.

The 'cols' attribute sets the visible width of a textarea in characters. Other options like 'width' or 'size' are not valid for textarea.

❓ accessibility

advanced

Which option correctly associates a label with a textarea for accessibility?

You want to make sure screen readers correctly identify the textarea. Which HTML snippet correctly links the label to the textarea?

A <label name="comment">Comment:</label><textarea id="comment"></textarea>

B <label>Comment:<textarea></textarea></label>

C <textarea aria-label="Comment"></textarea>

D <label for="comment">Comment:</label><textarea id="comment"></textarea>

💡 Hint

The 'for' attribute on label should match the textarea's id.

Option D uses the 'for' attribute on the label matching the textarea's 'id', which is the standard way to associate labels with form controls for accessibility. Option D nests textarea inside label which is valid but less explicit. Option D uses aria-label which is valid but less preferred than visible label. Option D uses 'name' on label which is invalid.

❓ layout

advanced

How to make a textarea fill its container width responsively?

You want a textarea to always fill 100% of its container's width and adjust on window resize. Which CSS rule achieves this?

HTML

<textarea></textarea>

A textarea { width: 100%; box-sizing: border-box; }

B textarea { width: 100vw; }

C textarea { max-width: 100%; }

D textarea { width: auto; }

💡 Hint

Consider how padding and borders affect width and how to include them.

Setting width to 100% makes the textarea fill its container width. Adding 'box-sizing: border-box' ensures padding and borders are included inside that width, preventing overflow. Option A uses viewport width which ignores container size. Option A only limits max width but doesn't set width. Option A uses auto width which depends on content.

🧠 Conceptual

expert

What happens if you set both rows and style height on a textarea?

Given this HTML:

<textarea rows="4" style="height: 200px;"></textarea>

Which statement is true about the textarea's height?

HTML

<textarea rows="4" style="height: 200px;"></textarea>

A The browser throws an error because of conflicting height settings.

B The rows attribute sets the height and style height is ignored.

C The inline style height (200px) overrides the rows attribute height.

D The textarea height is the sum of rows height plus 200px.

💡 Hint

CSS styles override HTML attributes when both affect the same property.

The 'rows' attribute sets the height in terms of text lines, but an explicit CSS height style overrides this. So the textarea will be 200px tall regardless of rows. Browsers do not throw errors for this.

Practice

1. What is the main purpose of the <textarea> tag in HTML?

easy

A. To display a single line of text that cannot be edited.

B. To add a button that submits a form.

C. To create a multi-line text input box for users to type in.

D. To insert an image into the webpage.

Solution

1. Step 1: Understand the <textarea> tag function

   The <textarea> tag is designed to allow users to enter multiple lines of text, unlike <input> which is usually single line.

2. Step 2: Compare options with the tag's purpose

   Options A, C, and D describe other HTML elements or functions, not multi-line text input.

3. Final Answer:

   To create a multi-line text input box for users to type in. -> Option C

4. Quick Check:

   Textarea = multi-line input [OK]

Hint: Textarea means multi-line text box for typing [OK]

Common Mistakes:

• Confusing <textarea> with <input> for single line input
• Thinking <textarea> is for buttons or images
• Assuming <textarea> is read-only

2. Which of the following is the correct way to set the size of a <textarea> using HTML attributes?

easy

A. <textarea rows='4' cols='50'></textarea>

B. <textarea length='50' height='4'></textarea>

C. <textarea size='large'></textarea>

D. <textarea width='300' height='100'></textarea>

Solution

1. Step 1: Recall valid <textarea> size attributes

   The rows and cols attributes define the visible height and width in lines and characters.

2. Step 2: Check each option for correct attribute usage

   <textarea rows='4' cols='50'></textarea> uses rows and cols correctly. Options A, B, and C use invalid or non-existent attributes.

3. Final Answer:

   <textarea rows='4' cols='50'></textarea> -> Option A

4. Quick Check:

   Rows and cols set size [OK]

Hint: Use rows and cols to size textarea in HTML [OK]

Common Mistakes:

• Using width and height attributes directly on textarea
• Using non-standard attributes like size or length
• Confusing CSS properties with HTML attributes

3. What will be displayed in the browser for this HTML snippet?

<label for='msg'>Message:</label>
<textarea id='msg' rows='3' cols='20'>Hello World</textarea>

medium

A. A textarea box with no text inside and no label.

B. Only the text 'Hello World' displayed as plain text, no textarea box.

C. An error message because 'for' attribute is invalid on label.

D. A label 'Message:' and a textarea box showing 'Hello World' inside it with 3 rows and 20 columns.

Solution

1. Step 1: Understand label and textarea relationship

   The label with for='msg' links to the textarea with id='msg', so the label 'Message:' appears next to the textarea.

2. Step 2: Check textarea content and size

   The textarea shows the default text 'Hello World' inside it, sized with 3 rows and 20 columns.

3. Final Answer:

   A label 'Message:' and a textarea box showing 'Hello World' inside it with 3 rows and 20 columns. -> Option D

4. Quick Check:

   Label linked and textarea shows default text [OK]

Hint: Label with for matches textarea id; default text shows inside [OK]

Common Mistakes:

• Thinking label text appears inside textarea
• Assuming textarea is empty if text is inside tags
• Believing 'for' attribute causes error

4. Identify the error in this HTML code snippet:

<textarea rows='5' cols='30'>Enter your comment here</textarea

medium

A. Missing closing angle bracket '>' at the end of the closing textarea tag.

B. Incorrect use of rows and cols attributes.

C. Textarea cannot have default text inside it.

D. Textarea tag should be self-closing.

Solution

1. Step 1: Check the closing tag syntax

   The closing </textarea tag is missing the closing '>' character, which is required to properly close the tag.

2. Step 2: Validate other parts of the code

   The rows and cols attributes are correctly used, default text inside textarea is allowed, and textarea is not self-closing.

3. Final Answer:

   Missing closing angle bracket '>' at the end of the closing textarea tag. -> Option A

4. Quick Check:

   Proper closing tag syntax needed [OK]

Hint: Always close tags fully with '>' [OK]

Common Mistakes:

• Forgetting the closing '>' in tags
• Thinking textarea must be self-closing
• Believing default text inside textarea is invalid

5. You want to create a form with a textarea that is accessible and responsive. Which of the following is the best practice?

hard

A. Use a placeholder inside the textarea instead of a label, and fix width with pixels.

B. Use a <label> linked to the textarea with for and id, set rows and cols, and style width with CSS using relative units.

C. Do not use a label, set rows and cols to zero, and rely on default size.

D. Use inline styles with fixed pixel width and no label for simplicity.

Solution

1. Step 1: Ensure accessibility with label and linking

   Using a <label> with for attribute matching the textarea's id helps screen readers and keyboard users.

2. Step 2: Use rows and cols for basic size and CSS with relative units for responsiveness

   Rows and cols define visible size, while CSS with relative units like em or % makes the textarea adapt to different screen sizes.

3. Final Answer:

   Use a <label> linked to the textarea with for and id, set rows and cols, and style width with CSS using relative units. -> Option B

4. Quick Check:

   Label + rows/cols + responsive CSS = best practice [OK]

Hint: Always label textarea and use relative CSS units for responsiveness [OK]

Common Mistakes:

• Using placeholder instead of label for accessibility
• Fixing width with pixels causing poor responsiveness
• Omitting label making form less accessible