Bootstrap is the most popular HTML, CSS framework option when it comes to dealing with a responsive and mobile front-end web development first. In addition, it is free and open source.

Launched in 2011, Bootstrap has all the HTML, CSS and JS-based design templates that are required to create buttons, forms, navigation, typography and other interface components.

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Bootstrap Interview Questions

What is bootstrap? Explain

Bootstrap is a front-end framework that is used to create HTML, CSS and JS web applications. Its design is very sensitive, easy and quick to use. It mainly focuses on creating a mobile application with design templates to create UI as drop-down menu, forms, buttons, alerts tab, etc.

Why is Bootstrap used for mobile web development?

It is used for mobile web development because it has responsive designs and templates that are easy to use.

Explain why choosing Bootstrap to build the websites?

There are few reasons why we chose Bootstrap to create websites

Mobile support: for mobile devices, it provides full support in a single file instead of in a separate file. Supports responsive design, including CSS adjustment based on different device types, screen size, etc. Reduce additional effort for developers.
Easy to learn: writing applications in bootstrap is easy if you know CSS and HTML
Browser support: it is compatible with all popular browsers such as Firefox, Opera, Safari, IE, etc.

What are the key components of Bootstrap?
  • Scaffolding: it has the grid system, background, styles/ link styles
  • JS Add-ons and JavaScript Plugins : contains JS and jQuery add-ons and many jQuery and JavaScript plugins .
  • Customize: you can customize frames or To get your own version of framework .
  • CSS: contains CSS files or with plenty of CSS files .
Why Use Bootstrap?
  • Easy to use: Anyone with basic knowledge of HTML and CSS can start using Bootstrap
  • Responsive Features: Bootstrap’s responsive CSS adjusts on phones, tablets, and desktops
  • Mobile-first approach: In Bootstrap, mobile-first styles are part of the core framework
  • Browser Compatibility: Bootstrap is compatible with all modern browsers (Chrome, Firefox, Internet Explorer, Edge, Safari and Opera)
What do you understand by Bootstrap container?

The Bootstrap container behaves like a container where you can put HTML code and is a part of the page where you can place the content of the site to respond and be fast.

In Other Word- The Bootstrap container is a class that is useful and creates a centered area within the page where the content of our site can be placed. The advantage of bootstrap .container is that it responds and will place all our other HTML codes.

How many types of designs are in Bootstrap? or What are the types of design available in Bootstrap?

In Bootstrap there are two types of design available.

  • Fluid Design
  • Fixed Design

Fluid design: the fluid design is used when you want to create an application that is 100% wide and uses the entire screen width
Fixed design: for a standard screen, you will use the fixed design option (940 px)

What is the Bootstrap grid system? Explain

To create a page layout through a series of rows and columns that host its content, Bootstrap Grid System is used.

In this Article- By using the grid system, we can make up to 12 columns on a page. There are different classes that have been defined for this for the purpose of UI.

What are grid classes in Bootstrap?

There are four grid classes in Bootstrap.

They are:

xs (used for phone screens less than 786 pixels wide).
sm (used for tablet screens that are more than 786 px wide).
md (it is for a small laptop screen of a size equal to or greater than 992 px wide).
LG (it is for laptop and desktop screens that are equal to more than 1200px wide).

Please explain about offset columns in Bootstrap?

For more specialized designs, offsets are a useful feature. To get more space, they can be used by pressing the column.

For example, classes .col-xs = * do not support scrolling, but are easily replicated using an empty cell

What is Jumbotron in Bootstrap for?

In bootstrap, Jumbotron is generally used for content that you want to highlight, such as a slogan or marketing title, etc., in other words, it is used to extend the size of headings and add a margin for the content of the landing page.

To use the Jumbotron in Bootstrap

Create a container with the class of .jumbotron

Explain what Bootstrap collapsing elements are?

Bootstrap’s contraction elements allow you to contract any particular element without writing any JavaScript code or accordion marking. In Bootstrap to apply collapsing elements, you must add data-toggle = “collapse” to the controller element along with a data target or href to automatically assign control of a collapsible element. Similarly, you can use .collapse (options), .collapse (“show”) or .collapse (“hide”)

What explains Bootstrap well?

Bootstrap well is a container that makes the content appear sunken or an insert effect on the page. To create a well, wrap the content that you want to appear in the well with a containing the .well class.

How can we make the image respond in Bootstrap?

After the updates in Bootstrap, the function has been added to make an image respond, we can do this by adding an .img-responsive class to the tag. This class makes the width max-width = 100%; and height = auto; to the image to match very well with the parent element.

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