Ratio utilities for embeds in Bootsrap - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a responsive 16:9 video embed using Bootstrap ratio utilities.

Bootsrap

<div class="ratio [1]">
  <iframe src="https://www.youtube.com/embed/dQw4w9WgXcQ" title="YouTube video" allowfullscreen></iframe>
</div>

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

Aratio-4x3

Bratio-16x9

Cratio-1x1

Dratio-21x9

Attempts:

3 left

💡 Hint

Common Mistakes

Using ratio-4x3 which is for older TV screens.

Forgetting to add the ratio class before the ratio size.

The ratio-16x9 class sets the aspect ratio to 16:9, which is standard for most videos.

2fill in blank

medium

Complete the code to create a square (1:1) responsive embed container.

Bootsrap

<div class="ratio [1]">
  <iframe src="https://player.vimeo.com/video/76979871" title="Vimeo video" allowfullscreen></iframe>
</div>

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

Aratio-1x1

Bratio-16x9

Cratio-4x3

Dratio-21x9

Attempts:

3 left

💡 Hint

Common Mistakes

Using ratio-16x9 which is rectangular.

Not including the ratio base class.

The ratio-1x1 class creates a square container, useful for square videos or images.

3fill in blank

hard

Fix the error in the code to properly apply Bootstrap ratio utilities for a 4:3 embed.

Bootsrap

<div class="ratio [1]">
  <iframe src="https://www.example.com/embed" title="Example embed" allowfullscreen></iframe>
</div>

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

Aratio4x3

Bratio-16x9

Cratio-4x3

Dratio_4x3

Attempts:

3 left

💡 Hint

Common Mistakes

Using ratio4x3 without a hyphen causes the class to not apply.

Using underscores instead of hyphens.

The correct class is ratio-4x3 with a hyphen, following Bootstrap's naming convention.

4fill in blank

hard

Fill both blanks to create a responsive embed with a 21:9 ratio and add a border using Bootstrap classes.

Bootsrap

<div class="ratio [1] border [2] p-3">
  <iframe src="https://www.example.com/embed" title="Wide embed" allowfullscreen></iframe>
</div>

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

Aratio-21x9

Bborder-primary

Cborder-secondary

Dratio-16x9

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up ratio classes and border classes.

Using a ratio class that doesn't match the desired aspect ratio.

Use ratio-21x9 for the wide aspect ratio and border-primary for a blue border.

5fill in blank

hard

Fill all three blanks to create a responsive 4:3 embed with a shadow and rounded corners using Bootstrap classes.

Bootsrap

<div class="ratio [1] shadow [2] rounded [3]">
  <iframe src="https://www.example.com/embed" title="Styled embed" allowfullscreen></iframe>
</div>

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

Aratio-4x3

Bborder

Cborder-success

Dborder-danger

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the base border class.

Using a border color class without the base border class.

The ratio-4x3 sets the aspect ratio, border adds a border, and border-success colors the border green.

Practice

1. What is the main purpose of Bootstrap's ratio utility classes like ratio-16x9?

easy

A. To change the background color of embedded content

B. To add borders around embedded content

C. To keep embedded videos or iframes responsive and maintain their aspect ratio

D. To add padding inside embedded content

Solution

1. Step 1: Understand the purpose of ratio utilities

   Bootstrap's ratio utilities are designed to keep embedded content like videos or iframes responsive by maintaining a fixed aspect ratio.

2. Step 2: Identify what ratio classes do

   Classes like ratio-16x9 set the width and height ratio so the content scales properly on different screen sizes.

3. Final Answer:

   To keep embedded videos or iframes responsive and maintain their aspect ratio -> Option C

4. Quick Check:

   Ratio utilities = responsive aspect ratio [OK]

Hint: Ratio classes keep embeds sized correctly on all screens [OK]

Common Mistakes:

• Thinking ratio classes add borders or colors
• Confusing ratio with padding or margin utilities
• Using ratio classes without wrapping content in a div

2. Which is the correct HTML structure to use Bootstrap's ratio utility for a 4:3 embedded video?

easy

A.

B.

C.

D.

Solution

1. Step 1: Check the required wrapper and classes

   Bootstrap requires a div with class ratio plus the aspect ratio class like ratio-4x3 wrapping the embedded content.

2. Step 2: Verify the iframe is inside the wrapper

   The iframe should not have the ratio class directly; it must be inside the div with the ratio classes.

3. Final Answer:

   <div class='ratio ratio-4x3'><iframe src='video.mp4'></iframe></div> -> Option A

4. Quick Check:

   Wrapper div with ratio classes = correct syntax [OK]

Hint: Wrap iframe in div with both 'ratio' and ratio-size classes [OK]

Common Mistakes:

• Applying ratio class directly on iframe
• Missing the 'ratio' base class on the wrapper div
• Using only one class without the other

3. What will be the visual result of this code snippet?

<div class='ratio ratio-1x1'>
  <iframe src='https://example.com' title='Example'></iframe>
</div>

medium

A. An iframe with fixed width and height ignoring screen size

B. A rectangular iframe with 16:9 ratio

C. An iframe that overflows outside the container

D. A square embedded iframe that scales responsively

Solution

1. Step 1: Understand the ratio-1x1 class effect

   The class ratio-1x1 sets the aspect ratio to 1:1, which means width equals height, making the embed square.

2. Step 2: Recognize responsive scaling behavior

   Because it's wrapped in a div with ratio classes, the iframe scales responsively to fit its container while keeping the square shape.

3. Final Answer:

   A square embedded iframe that scales responsively -> Option D

4. Quick Check:

   ratio-1x1 = square responsive embed [OK]

Hint: ratio-1x1 means square shape that scales with container [OK]

Common Mistakes:

• Confusing 1x1 with 16x9 ratio
• Thinking iframe size is fixed
• Ignoring the responsive wrapper effect

4. Identify the error in this Bootstrap embed code:

<div class='ratio-16x9'>
  <iframe src='video.mp4'></iframe>
</div>

medium

A. The iframe tag is not closed properly

B. Missing the base class ratio on the wrapper div

C. The ratio class should be on the iframe, not the div

D. The src attribute value is invalid

Solution

1. Step 1: Check the required classes for ratio utility

   Bootstrap requires the wrapper div to have the base class ratio along with the aspect ratio class like ratio-16x9.

2. Step 2: Verify the given code

   The div only has ratio-16x9 but is missing the base ratio class, so the aspect ratio styling won't apply correctly.

3. Final Answer:

   Missing the base class ratio on the wrapper div -> Option B

4. Quick Check:

   Always include 'ratio' base class with ratio-size class [OK]

Hint: Always use both 'ratio' and ratio-size classes on wrapper div [OK]

Common Mistakes:

• Using ratio class on iframe instead of div
• Forgetting to add the base 'ratio' class
• Assuming iframe needs ratio classes

5. You want to embed a video that should always appear as a perfect square on all devices, but also add a subtle shadow around it. Which Bootstrap classes and structure should you use?

hard

A. <div class='ratio ratio-1x1 shadow-sm'><iframe src='video.mp4' title='Video'></iframe></div>

B. <iframe class='ratio-1x1 shadow-sm' src='video.mp4' title='Video'></iframe>

C. <div class='ratio-16x9 shadow-sm'><iframe src='video.mp4' title='Video'></iframe></div>

D. <div class='shadow-sm'><iframe class='ratio ratio-1x1' src='video.mp4' title='Video'></iframe></div>

Solution

1. Step 1: Choose the correct ratio class for a square

   The class ratio-1x1 ensures the embed is a perfect square on all devices.

2. Step 2: Add shadow styling correctly

   The shadow utility shadow-sm should be added to the same wrapper div that holds the ratio classes to apply the shadow around the embed.

3. Step 3: Confirm correct HTML structure

   The iframe should be inside the div with both ratio and shadow-sm classes. Applying ratio classes directly on iframe is incorrect.

4. Final Answer:

   <div class='ratio ratio-1x1 shadow-sm'><iframe src='video.mp4' title='Video'></iframe></div> -> Option A

5. Quick Check:

   Wrapper div with ratio and shadow classes = correct [OK]

Hint: Add shadow class to ratio wrapper div for styling [OK]

Common Mistakes:

• Putting ratio classes on iframe instead of div
• Using wrong ratio class for square shape
• Adding shadow to iframe instead of wrapper