Introduction
Aspiring web developers often encounter Bootstrap as a fundamental tool in their toolkit. With its robust set of pre-designed components and responsive grid system, Bootstrap simplifies the process of creating stylish and responsive websites. However, mastering Bootstrap requires a deep understanding of its features, functionalities, and best practices.
Are you ready to start and prepare Bootstrap interview questions?
Bootstrap Interview Questions for Freshers
1) What is Bootstrap?
It is a computer programming tool with pre-written strings of code or snippets, which can be used for web development to add interactive interfaces and design the website. Its code consists of HTML(Hypertext Markup Language) and CSS(Cascading Style Sheets). We use it for designing tables, forms, typography, etc. It also has an optional javascript plugin. For mobile web applications, Bootstrap is mainly recommended.
2) What is the basic use of Bootstrap?
Bootstrap is mainly used to quickly build responsive and visually attractive websites without creating them from scratch. It delivers pre-designed elements and styles, making web development more effortless.
3) What are Bootstrap types?
Bootstrap offers two primary layout types: Fluid Layout and Fixed Layout. Fluid Layout adjusts content to screen size, while Fixed Layout maintains a consistent width.
4) What are the advantages of Bootstrap?
The following given are the advantages of Bootstrap-
- We can quickly use Bootstrap with a basic understanding of HTML and CSS.
- We have responsive CSS in Bootstrap, which can be adapted to tablets, phones, and desktops.
- Modern browsers are compatible, including Chrome, Internet Explorer, Firefox, Brave, Edge, Safari, and Opera with Bootstrap 4.
5) What is a Bootstrap Container, and how does it work?
It is a handy class that generates a central region on the page where your site content can be put. Being responsive and containing all HTML code are the advantages of Bootstrap ‘.container’. We use a container to pad the content inside the bootstrap container.
There are two types of containers-
- The .container class can create a responsive and fixed-width container.
- The .container-fluid class can create a full-width container that spans the entire viewport width.
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The .container-{breakpoint}, with width of 100% until a specified breakpoint.
6) What do the default Bootstrap text settings consist of?
In Bootstrap 4, the text is set at a default font size of 16 pixels, with a line spacing 1.5. The standard font family is "Helvetica Neue," followed by "Helvetica," "Arial," and a generic sans-serif. Moreover, <p> elements have a margin-top of 0 and a margin-bottom of 1 rem (16 pixels by default).
7) What is a lead?
In Bootstrap, developers use the "lead" class to emphasize a paragraph of text. This class improves the font size and adds spacing to the paragraph, making it stand out and capturing the reader's engagement. People often use it for training or emphasizing important text content on web pages.
8) What does the term 'flexbox' refer to in Bootstrap 4?
In Bootstrap 4, 'flexbox' refers to a layout system that helps arrange elements within a webpage flexibly and efficiently, enabling easier alignment, distribution, and content responsiveness.
9) Explain the difference between Bootstrap 4 and Bootstrap 5?
In Bootstrap 4, form elements appeared as the default style provided by web browsers. But with Bootstrap 5, these form elements come with a custom design, ensuring a consistent and unified appearance across all web browsers.
10) Explain the difference between Bootstrap 3 and Bootstrap 4?
Bootstrap 3 and Bootstrap 4 are website design tools, but they differ. Bootstrap 4 offers additional advanced features, more useful grid systems, and enhanced typography, making it better relaxed for modern web design than the older Bootstrap 3.
11) Why do we use Bootstrap for designing websites?
We use Bootstrap since it has many attractive qualities like -
- Easy to learn.
- Bootstrap supports all common browsers.
- Its code is responsive to every device.
- It contains files for coding websites for mobile devices.
12) What are the main components of Bootstrap?
The Bootstrap key components are-
-
Scaffolding
This component provides a basic structure with link style, Grid system, and background s provided by this component. -
CSS
Various CSS files are contained here. -
Layout component
This component gives the list of layout components. -
Customize
You can customize your components to get get your version of the framework. -
JavaScript plugins
Many jQuery and JavaScript plugins are contained here.
13) What is input groups in Bootstrap?
The input-group class acts like a box to make inputs better. It adds things like symbols or buttons before or after the input field. It works well with Bootstrap 5 for form text. To put help text before the input, use ".input-group" and add the form.
14) What do you mean by Bootstrap ClassLoader?
It is a part of Java and a main parental class of ClassLoader. Named classes can be changed to binary code by class loaders.
15) Which two codes do we use for code display in Bootstrap?
There are two direct ways to display code in Bootstrap-
- We use the <code> element to showcase a piece of inline code.
-
For displaying a code with multiple lines or a block element, we use the <pre> tag.
For example-
You can use the <pre> tag like this-
And <code> tag can be used as -
16) What is a progress bar in Bootstrap?
We use the progress bar in Bootstrap to show a process's progress. In HTML element that are suing <progress> keyword with HTML tag style we use progress bar. <progress> is used with CSS classes only made for the progress bar.
17) What do you mean by Bootstrap media query?
Based on viewport size or user's device size, we can change the design, positioning, moving, hiding elements/content, etc., done with media queries in Bootstrap.
18) What are the types of layouts we have in Bootstrap?
Two major types of layouts are there in Bootstrap-
- Fixed Layout- For a standard screen that is 940px, we use this layout.
-
Fluid Layout- We use this layout to create an app that is 100% wider and covers the width of the screen.
Note- We can use both types of layouts to make the design responsive.
19) What is the process of creating an alert in Bootstrap?
Creating an alert in Bootstrap involves using predefined classes to style a notification box. These classes specify the alert's appearance, such as color and icon, effectively conveying messages.
20) How can you wrap content in Bootstrap?
You can use the command ".container" to wrap and center the content. It provides fixed width responsive container.
21) How can we make an image round in Bootstrap 4?
".rounded" class is used to make an image rounded in Bootstrap.
For example -
The image will look something like this -
22) What are responsive utility classes in Bootstrap?
For concealing or exhibiting the HTML elements, which are based on screen resolution and discerned by a media query, we use a set of classes called Responsive utility.
Example- “hidden-md-down”
23) What is the use of the carousel plugin in Bootstrap?
We use the carousels plugin in Bootstrap:
To make sliders on the website pages.
To display large contents within a small space by adding a slider.
Examples:
.carousel(‘options’)
With optional options object, a carousel is initialized and starts cycling through items.
.carousel(‘next’)
This type of carousel cycles to the next item. In other words, it is a slideshow for cycling through a series of information/content.
.carousel(‘cycle’)
This type of carousel cycles through the items of carouse from left to right.
.carousel(‘pause’)
This type of carousel stops the carousel from cycling through the carousel items.
.carousel(‘prev’)
This type of carousel cycles to the previous item.
.carousel(‘number’)
This cycles the carousel to a particular frame.
.carousel('dispose')
This one destroys a carousel of an element.
24) How can we draw a toolbar of buttons in Bootstrap?
Unique sets of button groups are combined by the class .btn-toolbar to create more complex components.
25) What is a button group in Bootstrap?
When you want to stack multiple buttons on a single line together, we use button groups. Also, when you want to place items in a group, like alignment buttons together.
We use .btn-group class for building a basic button group if we use the .btn type with the .btn-group class to wrap a series of buttons.