Bootstrap Interview Questions and Answers

1. What is Bootstrap?

Bootstrap is a popular front-end framework for developing responsive and mobile-first web pages.

2. What are the advantages of using Bootstrap?

Responsive design, consistency across browsers, pre-styled components, and extensive documentation.

3. Explain the Bootstrap grid system.

The grid system uses containers, rows, and columns to layout and align content. It’s based on a 12-column layout.

4. How do you make a column in Bootstrap take up multiple columns in a row?

Use the .col-span classes like .col-md-6 to make the column span 6 out of 12 columns.

5. What are Bootstrap containers?

Containers are used to contain, pad, and (sometimes) center the content within them. Types include .container, .container-fluid, and .container-{breakpoint}.

6. What are Bootstrap components?

Pre-designed UI components like buttons, modals, navbars, alerts, and more.

7. How do you use Bootstrap’s responsive utilities?

Use classes like .d-none, .d-sm-block, .d-md-none to control the display property of elements at different breakpoints.

8. Explain how to use Bootstrap’s form components.

Bootstrap provides styles and classes for form controls like inputs, labels, textareas, and selects to create consistent and responsive forms.

9. What are Bootstrap’s helper classes?

Helper classes are utility classes that can be used to quickly style elements, like .text-center, .bg-primary, .mt-3.

10. How do you create a responsive navigation bar with Bootstrap?

Use the .navbar component with classes like .navbar-expand-lg, .navbar-light, and .navbar-dark along with a .navbar-collapse for collapsible content.

11. What is the purpose of the .card component in Bootstrap?

The .card component is used to create flexible and extensible content containers with multiple variants and options for headers, footers, content, and more.

12. How do you use Bootstrap’s modal component?

Modals are created using the .modal class along with JavaScript to control the display. They include a header, body, and footer.

13. What are Bootstrap’s spacing utilities?

Spacing utilities control the margin and padding of elements with classes like .m-3 (margin) and .p-3 (padding).

14. How do you customize Bootstrap?

Customization can be done by overriding the default styles with your own CSS, using Bootstrap’s customization options, or using a CSS preprocessor like SASS.

15. Explain the use of Bootstrap’s JavaScript plugins.

Bootstrap includes JavaScript plugins for components like modals, tooltips, popovers, carousels, and more. These can be activated via data attributes or JavaScript.

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Bootstrap Interview Questions and Answers