Top 30 Bootstrap 5 Interview Questions

In this article, we share the top 30 Bootstrap 5 interview questions and answers. The interview questions will help you prepare for the interview on Bootstrap 5. These are the top 30 Interview questions and answers that are asked by top recruiters.

Bootstrap 5 is the latest version of the popular front-end framework that is widely used in web development. It offers an extensive set of tools and components that simplify the process of building responsive, mobile-first websites and applications.

As Bootstrap 5 gains more popularity, the demand for skilled developers who are proficient in the framework also increases.

If you are preparing for a Bootstrap 5 interview, it is important to have a good understanding of its concepts and features.

In this article, we will explore some of the most common Bootstrap 5 interview questions and provide detailed answers to help you prepare and succeed in your next interview.

1. What is Bootstrap, and why is it used?

Bootstrap is a popular open-source front-end framework used for designing responsive and mobile-first web pages.

Bootstrap framework simplifies the process of creating a responsive design by providing pre-built CSS and JavaScript components. Bootstrap is used to create consistent, modern, and mobile-friendly web designs quickly.

2. What are the advantages of using Bootstrap?

Bootstrap is a popular front-end framework that offers a wide range of benefits and advantages for developers.

Some of the key advantages of using Bootstrap are:

1. Responsive design: Bootstrap is designed with a responsive grid system that allows developers to create mobile-first designs that automatically adjust to different screen sizes and devices.
2. Consistency: Bootstrap provides a consistent set of styles and components that can be easily reused across multiple projects, helping to maintain a consistent design and user experience.
3. Customizable: Bootstrap can be easily customized using Sass variables and mixins, allowing developers to create unique designs and themes.
4. Cross-browser compatibility: Bootstrap is designed to work seamlessly across all modern web browsers, ensuring a consistent experience for all users.
5. Large community: Bootstrap has a large and active community of developers who contribute to the framework, provide support, and share resources.
6. Time-saving: Bootstrap provides a wide range of pre-built components, such as forms, buttons, and navigation menus, which can be easily customized and integrated into a project, saving developers time and effort.
7. Accessibility: Bootstrap is designed with accessibility in mind, making it easy to create web applications that are accessible to users with disabilities.

3. How do you include Bootstrap in a web page?

To include Bootstrap in a web page, you can either download and host the Bootstrap files on your server or use a Content Delivery Network (CDN) to load the necessary files.

Here is an example of how to include Bootstrap via CDN:

<!-- Add the following code inside the head tag -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

<!-- Add the following code before the closing body tag -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>

4. What is a jumbotron in Bootstrap?

In Bootstrap, a jumbotron is a large, full-width container that is used to highlight key content on a web page. It is typically used for showcasing important text, images, or call-to-action buttons.

The jumbotron class provides a simple and effective way to create a prominent section on a web page that draws the user’s attention to the content. The jumbotron class includes a background color and padding to create a container that spans the full width of the viewport.

Here’s an example of how to use the jumbotron class in Bootstrap:

<div class="jumbotron">
  <h1 class="display-4">Hello, world!</h1>
  <p class="lead">This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.</p>
  <hr class="my-4">
  <p>It uses utility classes for typography and spacing to space content out within the larger container.</p>
  <a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>
</div>

5. What is the difference between the .container and .container-fluid classes in Bootstrap?

The main difference between the .container and .container-fluid classes in Bootstrap is the width of the container.

The .container class creates a fixed-width container that is centered on the page. The width of the container is determined by the screen size, with different breakpoints for different screen sizes. By default, the .container class creates a container with a maximum width of 1140px.

On the other hand, the .container-fluid class creates a full-width container that spans the entire width of the viewport. It has no fixed width and adjusts to the screen size of the device.

6. What is a card in Bootstrap?

A card is a pre-designed component in Bootstrap that can be used to display content in a flexible and responsive manner. It is typically used to display information in a clean and organized way.

7. How do you create a basic card in Bootstrap?

You can create a basic card in Bootstrap by using the .card class on a <div> element, and adding the appropriate child elements to display content. For example:

<div class="card">
  <div class="card-body">
    This is a basic card.
  </div>
</div>

8. What are the different components that can be included in a card in Bootstrap?

Bootstrap provides several components that can be included in a card, including:

• Header (card-header)
• Body (card-body)
• Footer (card-footer)
• Image (card-img-top, card-img-bottom)
• Title (card-title)
• Subtitle (card-subtitle)
• Text (card-text)
• Link (card-link)
• List group (list-group, list-group-item)

9. How do you create a responsive card in Bootstrap?

To create a responsive card in Bootstrap, you can use the .card class on a container element and add other classes such as .card-body, .card-title, and .card-text to style the card content.

Here’s an example:

<div class="card">
  <img src="image.jpg" class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
</div>

10. How do you create a card with an image in Bootstrap?

You can create a card with an image in Bootstrap by using the .card class on a <div> element, and including an <img> element with the .card-img-top class.

For example:

<div class="card">
  <img src="image.jpg" class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
</div>

11. What is a form in Bootstrap?

A form is a pre-designed component in Bootstrap that can be used to collect user input.

It provides several pre-built form controls and layouts that can be customized as per the requirements.

12. How do you create a basic form in Bootstrap?

You can create a basic form in Bootstrap by using the .form class on a <form> element, and adding the appropriate form controls inside it.

For example:

<form class="form">
  <div class="form-group">
    <label for="exampleInputEmail1">Email address</label>
    <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
    <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
  </div>
  <div class="form-group">
    <label for="exampleInputPassword1">Password</label>
    <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
  </div>
  <div class="form-group form-check">
    <input type="checkbox" class="form-check-input" id="exampleCheck1">
    <label class="form-check-label" for="exampleCheck1">Check me out</label>
  </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

13. What are the different types of form controls available in Bootstrap?

Bootstrap provides several form controls that can be used to collect user input, including:

• Text input (<input type="text">)
• Email input (<input type="email">)
• Password input (<input type="password">)
• Textarea (<textarea></textarea>)
• Select (<select></select>)
• Checkbox (<input type="checkbox">)
• Radio buttons (<input type="radio">)
• Range (<input type="range">)
• File input (<input type="file">)
• Date and time (<input type="date">, <input type="time">, <input type="datetime-local">, etc.)

14. How do you create a horizontal form in Bootstrap?

You can create a horizontal form in Bootstrap by using the .form-horizontal class on a <form> element, and adding the appropriate form controls inside it.

For example:

<form class="form-horizontal">
  <div class="form-group row">
    <label for="inputEmail3" class="col-sm-2 col-form-label">Email</label>
    <div class="col-sm-10">
      <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
    </div>
  </div>
  <div class="form-group row">
    <label for="inputPassword3" class="col-sm-2 col-form-label">Password</label>
    <div class="col-sm-10">
      <input type="password" class="form-control" id="inputPassword3" placeholder="Password">
    </div>
  </div>
  <fieldset class="form-group">
    <div class="row">
      <legend class="col-form-label col-sm-2 pt-0">Radios</legend>
      <div class="col-sm-10">
        <div class="form-check">
          <input class="form-check-input" type="radio" name="gridRadios

15. How do you create a navbar using Bootstrap?

To create a navbar using Bootstrap, you can use the navbar component.

Here’s an example of how to create a simple navbar:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">My Website</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Contact</a>
      </li>
    </ul>
  </div>
</nav>

16. How do you create a responsive grid using Bootstrap?

To create a responsive grid using Bootstrap, you can use the grid system.

Bootstrap’s grid system uses a 12-column layout, which can be customized for different screen sizes.

Here’s an example of how to create a simple grid. In the below example, each column occupies 4 out of the 12 available columns on small screens and expands to full width on larger screens.

<div class="container">
  <div class="row">
    <div class="col-sm-4">Column 1</div>
    <div class="col-sm-4">Column 2</div>
    <div class="col-sm-4">Column 3</div>
  </div>
</div>

17. How do you create a modal using Bootstrap?

To create a modal using Bootstrap, you can use the modal component.

Here’s an example of how to create a simple modal:

<!-- Button to trigger the modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  Open Modal
</button>

<!-- The Modal -->
<div class="modal fade" id="myModal">
  <div class="modal-dialog">
    <div class="modal-content">
    
      <!-- Modal Header -->
      <div class="modal-header">
        <h4 class="modal-title">Modal Title</h4>
        <button type="button" class="close" data-dismiss="modal">&times;</button>
      </div>
      
      <!-- Modal body -->
      <div class="modal-body">
        Modal body text goes here.
      </div>
      
      <!-- Modal footer -->
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
      
    </div>
  </div>
</div>

18. How do you customize Bootstrap components?

Bootstrap provides a variety of CSS classes and variables that you can use to customize its components.

For example, you can change the color scheme, font, and spacing of Bootstrap components.

Here’s an example of how to change the color scheme of a button:

<!-- Add the following CSS code to your stylesheet -->
.btn-primary {
  color: #fff;
  background-color: #17a2b8;
  border-color: #17a2b8;
}

.btn-primary:hover {
  color: #fff;
  background-color: #138496;
  border-color: #117a8b;
}

19. What is the difference between Bootstrap’s grid system and flexbox?

Bootstrap’s grid system is a float-based layout system that uses rows and columns to create a grid.

It’s based on a fixed grid system where you define the number of columns, and the columns have fixed widths.

On the other hand, flexbox is a CSS layout module that allows you to create flexible and responsive layouts without using floats or positioning.

It’s based on a flexible box model, where you can define the size and position of items within a container using flexible dimensions.

20. How do you create a responsive navigation menu using Bootstrap?

To create a responsive navigation menu using Bootstrap, you can use the navbar component.

Here’s an example of how to create a simple responsive navigation menu:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Logo</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">About</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Contact</a>
      </li>
    </ul>
  </div>
</nav>

21. How do you use Bootstrap’s utility classes?

Bootstrap’s utility classes are a set of CSS classes that you can use to quickly style content without writing custom CSS.

They can be used for common tasks like setting the color or font size of text, changing the background color of an element, or aligning content within a container.

Here’s an example of how to use Bootstrap’s utility classes to style a text element:

<p class="text-primary font-weight-bold bg-light text-center">Hello, world!</p>

22. How do you customize Bootstrap’s default styles?

Bootstrap provides several ways to customize its default styles.

One way is to use Sass variables to override the default values.

For example, you can define a new value for the primary color like this:

$primary: #007bff;

Another way is to create a custom CSS file and override the default styles.

You can add your custom CSS file after the Bootstrap CSS file to ensure that your styles take precedence.

Here’s an example of how to change the background color of a button:

.btn {
  background-color: red;
}

23. How do you add custom fonts to a Bootstrap project?

To add custom fonts to a Bootstrap project, you can use the @font-face rule in your CSS file.

Here’s an example:

@font-face {
  font-family: 'CustomFont';
  src: url('/fonts/customfont.ttf') format('truetype');
}

body {
  font-family: 'CustomFont', sans-serif;
}

24. How do you implement a modal dialog using Bootstrap?

To implement a modal dialog using Bootstrap, you can use the Modal component.

Here’s an example:

<!-- Button to trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  Launch modal
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="myModalLabel">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        Modal content goes here.
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

25. What is an alert in Bootstrap?

An alert is a pre-designed component in Bootstrap that can be used to display important messages, warnings, or errors to users.

26. How do you create an alert in Bootstrap?

You can create an alert in Bootstrap by adding the .alert class to a <div> element, along with the appropriate modifier classes to specify the type of alert. For example:

27. What are the different types of alerts available in Bootstrap?

Bootstrap provides different types of alerts that can be used to convey different types of messages, including

• Primary
• Secondary
• Success
• Danger
• Warning,
• Info
• Light

28. How do you add a close button to an alert in Bootstrap?

You can add a close button to an alert in Bootstrap by adding the .alert-dismissible class to the <div> element, along with a button element that has the .close class and a data-dismiss attribute set to “alert”.

<div class="alert alert-danger alert-dismissible fade show" role="alert">
  <strong>Error:</strong> There was a problem with your submission.
  <button type="button" class="close" data-dismiss="alert" aria-label="Close">
    <span aria-hidden="true">&times;</span>
  </button>
</div>

29. How do you create a fade-in and fade-out effect for an alert in Bootstrap?

You can create a fade-in and fade-out effect for an alert in Bootstrap by adding the .fade and .show classes to the <div> element, along with the appropriate modifier classes to specify the type of alert

<div class="alert alert-success alert-dismissible fade show" role="alert">
  <strong>Success:</strong> Your submission was successful!
  <button type="button" class="close" data-dismiss="alert" aria-label="Close">
    <span aria-hidden="true">&times;</span>
  </button>
</div>

30. Does Bootstrap 5 uses jQuery?

No. From Bootstrap 5 onwards, jQuery is not used in the framework.

There is no dependency on jQuery.