Visibility property in CSS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the CSS visibility property control?

The visibility property controls whether an element is visible or hidden on the page, but it still takes up space even when hidden.

beginner

What is the difference between visibility: hidden; and display: none;?

visibility: hidden; hides the element but keeps its space on the page. display: none; removes the element completely, so it takes no space.

intermediate

What are the possible values of the visibility property?

Common values are:
- visible: element is shown
- hidden: element is hidden but space remains
- collapse: for table rows/columns, hides and removes space
- inherit: takes value from parent

intermediate

How does visibility: collapse; behave in tables?

In tables, visibility: collapse; hides the row or column and removes its space, similar to display: none;, but only for table elements.

beginner

Why might you use visibility: hidden; instead of display: none;?

Use visibility: hidden; when you want to hide an element but keep its space to avoid layout shifts or keep the page structure stable.

What happens when you set visibility: hidden; on an element?

A The element becomes transparent but clickable

B The element is removed and space is freed

C The element is hidden but space is kept

D The element is visible but blurred

visibility: hidden; hides the element but keeps its space on the page.

Which CSS property removes an element and frees its space completely?

A visibility: hidden;

B opacity: 0;

C visibility: collapse;

D display: none;

display: none; removes the element from the layout, freeing its space.

What is the default value of the visibility property?

A hidden

B visible

C collapse

D none

By default, elements have visibility: visible;, meaning they are shown.

For which HTML elements does visibility: collapse; have a special effect?

A Table rows and columns

B Paragraphs

C Images

D Buttons

visibility: collapse; hides table rows or columns and removes their space.

If you want to hide an element but keep the page layout unchanged, which property should you use?

A visibility: hidden;

B opacity: 0;

C display: none;

D position: absolute;

visibility: hidden; hides the element but keeps its space, preserving layout.

Explain how the CSS visibility property affects an element's display and layout on a webpage.

Think about how hiding differs from removing an element.

Describe a situation where using visibility: hidden; is better than display: none;.

Consider user experience when content disappears.

Practice

1. What does the CSS property visibility: hidden; do to an element on a webpage?

easy

A. It makes the element transparent but still clickable.

B. It hides the element but keeps its space reserved on the page.

C. It removes the element completely from the page layout.

D. It changes the element's color to match the background.

Solution

1. Step 1: Understand the visibility property

   The visibility property controls whether an element is visible or hidden but does not affect layout space.

2. Step 2: Analyze the effect of hidden

   When set to hidden, the element is not shown but still occupies space on the page.

3. Final Answer:

   It hides the element but keeps its space reserved on the page. -> Option B

4. Quick Check:

   visibility: hidden hides but keeps space [OK]

Hint: Hidden keeps space, display none removes it [OK]

Common Mistakes:

• Confusing visibility: hidden with display: none
• Thinking hidden elements are clickable
• Assuming hidden elements disappear completely

2. Which of the following is the correct CSS syntax to hide an element but keep its space using the visibility property?

easy

A. visibility: hidden;

B. visibility = hidden;

C. visible: hidden;

D. hide: visibility;

Solution

1. Step 1: Recall correct CSS property syntax

   CSS properties use a colon : between property and value, ending with a semicolon.

2. Step 2: Match syntax to visibility property

   The correct syntax is visibility: hidden; to hide but keep space.

3. Final Answer:

   visibility: hidden; -> Option A

4. Quick Check:

   Property: value; is correct CSS syntax [OK]

Hint: Use colon, not equals, for CSS properties [OK]

Common Mistakes:

• Using equals sign instead of colon
• Swapping property and value order
• Using non-existent CSS properties

3. Consider this HTML and CSS:

<div style="visibility: hidden; background: red; width: 100px; height: 100px;">Box</div>

What will you see on the webpage?

medium

A. A transparent box with the text 'Box' visible.

B. A red box with the text 'Box' visible.

C. No space or box visible at all.

D. No red box or text, but space is reserved where the box would be.

Solution

1. Step 1: Analyze the visibility property effect

   The style visibility: hidden; hides the element but keeps its space on the page.

2. Step 2: Understand the visual output

   The red box and text are hidden, so nothing is visible, but the space of 100x100 pixels remains empty.

3. Final Answer:

   No red box or text, but space is reserved where the box would be. -> Option D

4. Quick Check:

   visibility: hidden hides content but keeps space [OK]

Hint: Hidden means invisible but space stays [OK]

Common Mistakes:

• Expecting the box to be visible
• Confusing with display:none which removes space
• Thinking text remains visible

4. You wrote this CSS but the element still shows on the page:

.hidden-box { visibility = hidden; }

What is the error?

medium

A. The syntax uses '=' instead of ':'.

B. The property name should be 'visible' not 'visibility'.

C. The class selector should start with '#', not '.'.

D. The value 'hidden' is invalid for visibility.

Solution

1. Step 1: Check CSS property syntax

   CSS uses a colon : to assign values, not an equals sign =.

2. Step 2: Identify the syntax error

   The code uses visibility = hidden; which is invalid syntax and ignored by browsers.

3. Final Answer:

   The syntax uses '=' instead of ':'. -> Option A

4. Quick Check:

   Use colon for CSS property assignment [OK]

Hint: CSS uses colon, not equals, for properties [OK]

Common Mistakes:

• Using '=' instead of ':' in CSS
• Confusing class selector '.' with id selector '#'
• Assuming 'hidden' is invalid value

5. You want to hide a button but keep the page layout stable so other elements don't move. Which CSS property and value should you use?

hard

A. display: none;

B. position: absolute; left: -9999px;

C. visibility: hidden;

D. opacity: 0;

Solution

1. Step 1: Understand layout impact of hiding methods

   display: none; removes element and space, opacity: 0; hides visually but keeps clickable, position: absolute; left: -9999px; moves element off screen.

2. Step 2: Choose method that hides but keeps space

   visibility: hidden; hides element but keeps its space, keeping layout stable.

3. Final Answer:

   visibility: hidden; -> Option C

4. Quick Check:

   visibility: hidden hides but keeps space [OK]

Hint: Use visibility hidden to keep space but hide element [OK]

Common Mistakes:

• Using display:none which removes space
• Using opacity:0 but element remains interactive
• Moving element off screen breaks accessibility