Bootstrap 4 - Overview
Bootstrap 4 - Overview

Bootstrap 4 is a powerful and popular mobile first front-end framework for building responsive mobile first sites on the web. This is the latest version of Bootstrap which uses HTML, CSS and JavaScript.
story
The latest stable version of Bootstrap v3.3.7 was in July 2016, and Bootstrap 4.0.0 beta was released in August 2017.
Why use Bootstrap?
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It contains mobile first styles throughout the library instead of using them in separate files.
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With just knowledge of HTML and CSS, anyone can get started with Bootstrap. There is also some good documentation on the official Bootstrap website.
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It is supported by all popular browsers and its responsive CSS adjusts to desktops, tablets and mobile phones.
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Provides a clean and unified front end solution for developers.
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It contains beautiful and functional built-in components that are easy to customize.
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It is open source and provides web settings.
It contains mobile first styles throughout the library instead of using them in separate files.
With just knowledge of HTML and CSS, anyone can get started with Bootstrap. There is also some good documentation on the official Bootstrap website.
It is supported by all popular browsers and its responsive CSS adjusts to desktops, tablets and mobile phones.
Provides a clean and unified front end solution for developers.
It contains beautiful and functional built-in components that are easy to customize.
It is open source and provides web settings.
Bootstrap 3 v/s Bootstrap 4
Bootstrap 4 is the latest version of Bootstrap 3 that converts CSS source files to SCSS. It uses a flexible modal for the grid system and supports all the latest browsers. However, it does support Internet Explorer 9+ and iOS 7+ and has dropped support for IE 8 and earlier, iOS 6 and earlier. For more information on the difference between Bootstrap 3 and Bootstrap 4.