Bootstrap Interview Questions
Bootstrap is a popular framework for building responsive websites. Developers rely on Bootstrap to design fast and modern material UI elements. The article provides Bootstrap interview questions with straightforward answers.
This article provides questions of various difficulty levels for bootstrap users who are beginners, intermediate and advanced developers.
Beginner Level Bootstrap Interview Questions
1. What is Bootstrap?
A free CSS framework. Makes responsive websites fast.
2. How to include Bootstrap?
Two ways:
- CDN link in HTML
- Download files
3. What’s the grid system?
Rows and columns. 12 columns max. Use col-md-6 for half width.
4. How to make buttons?
Use btn class. Add btn-primary for blue color.
What’s a container?
A box that holds your content. Two types: fixed-width and full-width.
5. How does the grid work?
Uses rows and columns. 12 columns total per row.
6. Make a blue button<button class="btn btn-primary">Click</button>
7. What are Bootstrap components?
Ready-made parts like navbars, cards, and alerts.
8. How to make text center?
Add text-center class to any element.
9. What’s a navbar?
The menu bar at top of websites. Bootstrap makes it easy.
11. How to add padding?
Use classes like p-3 (padding all sides).
12. What’s a card component?
A flexible content container with options for images/text/buttons.
Intermediate Bootstrap Interview Questions
1. Explain breakpoints.
Screen size triggers:
sm(≥576px)md(≥768px)lg(≥992px)
2. How to center a div?
Use:
<div class="d-flex justify-content-center">
<div>Content</div>
</div>3. Difference between margin and padding?
Margin = outside space. Padding = inside space.
4. Make a 3-column layout
<div class="row">
<div class="col-md-4">Col 1</div>
<div class="col-md-4">Col 2</div>
<div class="col-md-4">Col 3</div>
</div>5. What are utility classes?
Shortcut classes like mt-2 (margin-top) or bg-light.
6. How to make a dropdown menu?
Use dropdown class with button and dropdown-menu.
7. What’s the difference between container and container-fluid?
container has max-width. container-fluid is always 100% width.
8. How to override Bootstrap styles?
Write your CSS after Bootstrap’s or use more specific selectors.
9. Make a responsive image<img class="img-fluid" src="..."> makes it scale properly.
10. What’s a modal?
A popup dialog box. Bootstrap includes ready-to-use modals.
Advance Bootstrap Interview Questions
1. Customize Bootstrap with Sass
Change variables in _variables.scss before compiling.
2. Optimize Bootstrap build
Only import components you need in your Sass file.
3. Create a theme
Modify color variables and recompile the CSS.
4. Bootstrap accessibility features
Includes ARIA attributes and screen reader classes.
5. Extend Bootstrap components
Use Sass @extend to build on existing components.
6. Bootstrap JavaScript plugins
Modal, carousel, tooltip – all work without writing JS.
7. Performance tips
Load only required JS, use CDN, defer non-critical CSS.
8. Bootstrap vs CSS Grid
Bootstrap for quick layouts. CSS Grid for complex custom designs.
9. Build system integration
Works with Webpack, Gulp, and other build tools.
10. Latest Bootstrap features
Dark mode, offcanvas, improved utilities in v5+.
Final Thoughts
The questions and their answers provide materials for Bootstrap interview questions. Regular practice helps you build up your self-assurance. All answers should be direct and easy to understand. Developing your web development skills along with mastering Bootstrap will take time. Happy coding!
