Focus variant in Tailwind - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply a blue border when the input is focused.

Tailwind

<input type="text" class="border [1]" aria-label="Name input">

Drag options to blanks, or click blank then click option'

Ahover:border-blue-500

Bfocus:border-blue-500

Cactive:border-blue-500

Dvisited:border-blue-500

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover: instead of focus: which styles on mouse hover, not keyboard focus.

Using active: which styles only while clicking, not on keyboard focus.

The focus: variant applies styles when the element is focused, such as when clicked or tabbed into.

2fill in blank

medium

Complete the code to change the background color to yellow when a button is focused.

Tailwind

<button class="p-2 [1] bg-gray-200" aria-label="Submit button">Submit</button>

Drag options to blanks, or click blank then click option'

Avisited:bg-yellow-300

Bhover:bg-yellow-300

Cactive:bg-yellow-300

Dfocus:bg-yellow-300

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover: which only works on mouse hover.

Using active: which applies only while clicking.

The focus:bg-yellow-300 class changes the background color when the button is focused, helping keyboard users see the active element.

3fill in blank

hard

Fix the error in the code to apply a red text color on focus for the link.

Tailwind

<a href="#" class="text-blue-600 [1]">Link</a>

Drag options to blanks, or click blank then click option'

Afocus:text-red-600

Bhover:text-red-600

Cactive:text-red-600

Dvisited:text-red-600

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover: which styles on mouse hover, not focus.

Using active: which styles only while clicking.

The focus:text-red-600 class applies red text color only when the link is focused, improving accessibility.

4fill in blank

hard

Fill both blanks to style the input with a green border and shadow on focus.

Tailwind

<input type="text" class="border border-gray-300 [1] [2] rounded" aria-label="Email input">

Drag options to blanks, or click blank then click option'

Afocus:border-green-500

Bhover:border-green-500

Cfocus:shadow-lg

Dactive:shadow-lg

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover: or active: variants instead of focus:.

Forgetting to add shadow on focus.

focus:border-green-500 changes the border color on focus, and focus:shadow-lg adds a shadow on focus for better visibility.

5fill in blank

hard

Fill all three blanks to style the button with a blue background, white text, and shadow on focus.

Tailwind

<button class="px-4 py-2 rounded [1] [2] [3]" aria-label="Save button">Save</button>

Drag options to blanks, or click blank then click option'

Afocus:bg-blue-600

Bfocus:text-white

Cfocus:shadow-md

Dhover:bg-blue-600

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover: instead of focus: variants.

Missing one of the style changes on focus.

The classes focus:bg-blue-600, focus:text-white, and focus:shadow-md style the button's background, text color, and shadow when focused, improving keyboard navigation visibility.

Practice

1. What does the focus: variant in Tailwind CSS do?

easy

A. Applies styles only when an element is disabled

B. Applies styles only when an element is hovered

C. Applies styles only when an element is clicked

D. Applies styles only when an element is focused

Solution

1. Step 1: Understand the focus variant purpose

   The focus: variant applies styles when an element receives keyboard or mouse focus, helping users identify the active element.

2. Step 2: Compare with other states

   Hover applies on mouse hover, click is not a Tailwind variant, and disabled is a different state. Only focus matches the description.

3. Final Answer:

   Applies styles only when an element is focused -> Option D

4. Quick Check:

   focus: = styles on focus [OK]

Hint: Focus variant styles appear only when element is focused [OK]

Common Mistakes:

• Confusing focus with hover
• Thinking focus applies on click
• Mixing focus with disabled state

2. Which of the following is the correct Tailwind syntax to change text color to blue only when an input is focused?

easy

A. focus:text-blue-500

B. text-blue-500:focus

C. focus_text-blue-500

D. text-blue-500-focus

Solution

1. Step 1: Recall Tailwind variant syntax

   Tailwind uses the format variant:utility, so focus variant is focus: before the utility class.

2. Step 2: Identify correct option

   Only focus:text-blue-500 matches the correct syntax. Others misuse colons or underscores.

3. Final Answer:

   focus:text-blue-500 -> Option A

4. Quick Check:

   Variant prefix + colon + utility = correct [OK]

Hint: Use focus: prefix before utility class [OK]

Common Mistakes:

• Placing :focus after utility
• Using underscores instead of colon
• Appending -focus to utility class

3. What will be the text color of this button when focused?

<button class="text-gray-700 focus:text-red-600">Click me</button>

medium

A. Red when focused, gray when not focused

B. Always red

C. Gray when focused, red when not focused

D. Always gray

Solution

1. Step 1: Understand base and focus styles

   The button has base text color text-gray-700 and changes to text-red-600 only on focus.

2. Step 2: Determine color on focus and blur

   When focused, focus:text-red-600 overrides base gray color. When not focused, base gray applies.

3. Final Answer:

   Red when focused, gray when not focused -> Option A

4. Quick Check:

   focus: overrides base style on focus [OK]

Hint: Focus styles override base only when focused [OK]

Common Mistakes:

• Thinking focus styles apply always
• Confusing base and focus colors
• Assuming no color change on focus

4. Identify the error in this Tailwind class usage to add a blue border on focus:

<input class="border focus-border-blue-500" />

medium

A. Border cannot change color on focus

B. Wrong utility name 'border-blue-500'

C. Missing colon after focus

D. Focus variant cannot be used on inputs

Solution

1. Step 1: Check variant syntax

   The focus variant requires a colon after it, like focus:border-blue-500. The code uses focus-border-blue-500 which is invalid.

2. Step 2: Verify utility and element support

   border-blue-500 is a valid utility and inputs support focus styles, so no issues there.

3. Final Answer:

   Missing colon after focus -> Option C

4. Quick Check:

   Variant must have colon separator [OK]

Hint: Always use colon after variant like focus: [OK]

Common Mistakes:

• Omitting colon after focus
• Using dash instead of colon
• Assuming inputs can't have focus styles

5. You want a button to have a green background normally, but change to yellow background only when focused and also have a black border only on focus. Which Tailwind classes should you use?

hard

A. bg-green-500 bg-yellow-400 focus:border-black border

B. bg-green-500 focus:bg-yellow-400 border focus:border-black

C. bg-green-500 focus:bg-yellow-400 border-black focus:border

D. bg-green-500 focus:bg-yellow-400 focus:border-black border

Solution

1. Step 1: Set base styles

   Use bg-green-500 for normal background and border to set border width (default border color).

2. Step 2: Apply focus variants correctly

   Use focus:bg-yellow-400 to change background on focus and focus:border-black to change border color to black only on focus.

3. Step 3: Verify option correctness

   bg-green-500 focus:bg-yellow-400 border focus:border-black correctly uses base green background and border, and changes background and border color on focus. Others misuse border color or width.

4. Final Answer:

   bg-green-500 focus:bg-yellow-400 border focus:border-black -> Option B

5. Quick Check:

   Base border + focus:border-black = black border only on focus [OK]

Hint: Use base classes plus focus: variant for focus styles [OK]

Common Mistakes:

• Adding base 'border-black' (always black border)
• Missing base 'border' width
• Forgetting 'focus:border-black' color