Visibility utilities in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of Bootstrap's visibility utilities?

Bootstrap's visibility utilities help you show or hide elements easily on different screen sizes without writing custom CSS.

beginner

How do you hide an element only on small screens using Bootstrap visibility utilities?

Use the class d-none d-sm-block. This hides the element on extra small screens and shows it on small screens and larger.

beginner

What does the class d-md-none do?

It hides the element on medium screens and larger, but shows it on smaller screens.

intermediate

Explain the difference between d-none and invisible classes in Bootstrap.

d-none completely hides the element and removes it from the layout flow. invisible hides the element visually but keeps its space in the layout.

beginner

How can you make an element visible only on large screens using Bootstrap classes?

Use d-none d-lg-block. This hides the element on all screen sizes except large and above.

Which class hides an element on all screen sizes in Bootstrap?

A d-block

B d-inline

C visible

D d-none

d-none hides the element completely on all screen sizes.

What does d-sm-block do?

A Shows element on small screens and larger

B Shows element only on extra small screens

C Hides element on small screens

D Makes element inline on all screens

d-sm-block makes the element display as block starting from small screens and up.

If you want to hide an element only on medium and larger screens, which class should you use?

A d-md-none

B d-none d-md-block

C d-lg-none

D d-sm-none

d-md-none hides the element on medium and larger screens.

Which class keeps the element's space but hides it visually?

A d-none

B hidden

C invisible

D d-block

The invisible class hides the element but keeps its space in the layout.

To show an element only on large screens and hide it elsewhere, which classes do you use?

A d-lg-none

B d-none d-lg-block

C d-block d-lg-none

D d-none d-sm-block

d-none d-lg-block hides the element on all sizes except large and above.

Describe how Bootstrap visibility utilities help in creating responsive designs.

Think about how websites change layout on phones vs desktops.

Explain the difference between the Bootstrap classes d-none and invisible.

One hides completely, the other just makes it invisible.

Practice

1. What does the Bootstrap class d-none do to an element?

easy

A. It changes the element to display as a block.

B. It makes the element invisible but keeps its space.

C. It hides the element completely, removing it from the layout.

D. It makes the element visible only on small screens.

Solution

1. Step 1: Understand the d-none class purpose

   The d-none class sets display: none; on the element, hiding it completely.

2. Step 2: Effect on layout

   Because the element is removed from the layout flow, it takes no space on the page.

3. Final Answer:

   It hides the element completely, removing it from the layout. -> Option C

4. Quick Check:

   d-none hides element fully [OK]

Hint: Remember: d-none means no display at all [OK]

Common Mistakes:

• Confusing d-none with invisible
• Thinking it only hides visually but keeps space
• Assuming it only works on small screens

2. Which of the following is the correct way to make an element visible only on medium and larger screens using Bootstrap classes?

easy

A. d-md-none d-lg-block

B. d-none d-md-block

C. d-block d-md-none

D. d-none d-sm-block

Solution

1. Step 1: Understand breakpoint classes

   d-none hides the element on all screen sizes. d-md-block makes it display block starting at medium screens and up.

2. Step 2: Combine classes for desired visibility

   Using d-none d-md-block hides the element on small and extra small screens, shows it on medium and larger.

3. Final Answer:

   <code>d-none d-md-block</code> -> Option B

4. Quick Check:

   Hide all, show from medium up = d-none d-md-block [OK]

Hint: Use d-none plus breakpoint d-*-block to show [OK]

Common Mistakes:

• Reversing the breakpoint classes order
• Using d-block d-md-none which hides on medium screens
• Confusing sm and md breakpoints

3. Given this HTML snippet:

<div class="invisible">Hello</div>

What will you see in the browser?

medium

A. The text 'Hello' is hidden but the space remains.

B. The text 'Hello' is visible and takes space.

C. The text 'Hello' is hidden and no space is taken.

D. The text 'Hello' is visible only on large screens.

Solution

1. Step 1: Understand the invisible class effect

   The invisible class applies visibility: hidden;, hiding the content but keeping its space.

2. Step 2: Visual result in browser

   The text won't be seen, but the element's space remains reserved on the page.

3. Final Answer:

   The text 'Hello' is hidden but the space remains. -> Option A

4. Quick Check:

   invisible hides content but keeps layout space [OK]

Hint: invisible hides text but keeps space [OK]

Common Mistakes:

• Thinking invisible removes element from layout
• Confusing invisible with d-none
• Expecting text to show on some screen sizes

4. You want to hide a button on small screens but show it on medium and larger screens. Which Bootstrap class combination is incorrect?

medium

A. d-none d-sm-block

B. d-sm-none d-md-block

C. d-block d-sm-none d-md-block

D. d-none d-md-block

Solution

1. Step 1: Analyze d-none d-sm-block

   d-none hides element on all sizes, d-sm-block shows it from small screens up, so it remains hidden on extra small but visible on small and larger.

2. Step 2: Check requirement

   The requirement is to hide on small screens but show on medium and larger. This combination shows on small screens, so it is incorrect.

3. Final Answer:

   <code>d-none d-sm-block</code> -> Option A

4. Quick Check:

   Hide on small, show medium up needs d-none d-md-block [OK]

Hint: Check breakpoint start points carefully for show/hide [OK]

Common Mistakes:

• Using d-sm-block instead of d-md-block
• Adding redundant classes that conflict
• Assuming d-none can be overridden by smaller breakpoint

5. You want a paragraph to be hidden on extra small and small screens but visible on medium and large screens. Which class combination achieves this?

hard

A. invisible d-md-visible

B. invisible d-md-block

C. invisible d-md-visible d-md-block

D. d-none d-md-block

Solution

1. Step 1: Understand the requirement

   Hide the paragraph on xs and sm screens, make it visible on md and larger.

2. Step 2: Analyze correct option

   d-none d-md-block sets display: none by default (hides completely on xs/sm), then display: block from md up (visible on md+).

3. Step 3: Why other options fail

   A and C use non-existent d-md-visible. D uses invisible which applies visibility: hidden everywhere, so remains hidden even on md+.

4. Final Answer:

   <code>d-none d-md-block</code> -> Option D

5. Quick Check:

   Hide xs/sm completely, show md+ = d-none d-md-block [OK]

Hint: Use d-none d-md-block to hide below medium, show from medium [OK]

Common Mistakes:

• Using invisible which keeps space but stays hidden on large screens
• Using non-existent classes like d-md-visible
• Not understanding breakpoint overrides for display