Bootstrap (front-end framework)
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|Original author(s)||Mark Otto, Jacob Thornton|
|Developer(s)||Bootstrap Core Team|
|Initial release||August 19, 2011|
4.3.1 / February 13, 2019
|License||MIT License (Apache License 2.0 prior to 3.1.0)|
Bootstrap is the third-most-starred project on GitHub, with more than 131,000 stars, behind only freeCodeCamp (almost 300,000 stars) and marginally behind Vue.js framework. According to Alexa Rank, Bootstrap getbootstrap.com is in the top-2000 in US while vuejs.org is in top-7000 in US.
Bootstrap, originally named Twitter Blueprint, was developed by Mark Otto and Jacob Thornton at Twitter as a framework to encourage consistency across internal tools. Before Bootstrap, various libraries were used for interface development, which led to inconsistencies and a high maintenance burden. According to Twitter developer Mark Otto:
"A super small group of developers and I got together to design and build a new internal tool and saw an opportunity to do something more. Through that process, we saw ourselves build something much more substantial than another internal tool. Months later, we ended up with an early version of Bootstrap as a way to document and share common design patterns and assets within the company."
After a few months of development by a small group, many developers at Twitter began to contribute to the project as a part of Hack Week, a hackathon-style week for the Twitter development team. It was renamed from Twitter Blueprint to Bootstrap, and released as an open source project on August 19, 2011. It has continued to be maintained by Mark Otto, Jacob Thornton, and a small group of core developers, as well as a large community of contributors.
On January 31, 2012, Bootstrap 2 was released, which added built-in support for Glyphicons, several new components, as well as changes to many of the existing components. This version supports responsive web design. This means the layout of web pages adjusts dynamically, taking into account the characteristics of the device used (desktop, tablet, mobile phone). 
Mark Otto announced Bootstrap 4 on October 29, 2014. The first alpha version of Bootstrap 4 was released on August 19, 2015. The first beta version was released on 10 August 2017. Mark suspended work on Bootstrap 3 on September 6, 2016, to free up time to work on Bootstrap 4. Bootstrap 4 was finalized on January 18, 2018.
Significant changes include:
- Major rewrite of the code
- Replacing Less with Sass
- Addition of
Reboot, a collection of element-specific CSS changes in a single file, based on
- Dropping support for IE8, IE9, and iOS 6
- CSS Flexible Box support
- Adding navigation customization options
- Adding responsive spacing and sizing utilities
- Switching from the pixels unit in CSS to root ems
- Increasing global font size from 14px to 16px
- Dropping the
- Dropping the
- Huge number[quantify] of utility classes
- Improved form styling, buttons, drop-down menus, media objects and image classes
Bootstrap 4 supports the latest versions of the Google Chrome, Firefox, Internet Explorer, Opera, and Safari (except on Windows). It additionally supports back to IE9 and the latest Firefox Extended Support Release (ESR).
Bootstrap 5 is the upcoming major version of the framework.
Major changes include:
- Dropping support for IE10
- Moving testing infrastructure from QUnit to Jasmine
Bootstrap is a web framework that focuses on simplifying the development of informative web pages (as opposed to web apps). The primary purpose of adding it to a web project is to apply Bootstrap's choices of color, size, font and layout to that project. As such, the primary factor is whether the developers in charge find those choices to their liking. Once added to a project, Bootstrap provides basic style definitions for all HTML elements. The end result is a uniform appearance for prose, tables and form elements across web browsers. In addition, developers can take advantage of CSS classes defined in Bootstrap to further customize the appearance of their contents. For example, Bootstrap has provisioned for light- and dark-colored tables, page headings, more prominent pull quotes, and text with a highlight.
The most prominent components of Bootstrap are its layout components, as they affect an entire web page. The basic layout component is called "Container", as every other element in the page is placed in it. Developers can choose between a fixed-width container and a fluid-width container. While the latter always fills the width of the web page, the former uses one of the four predefined fixed widths, depending on the size of the screen showing the page:
- Smaller than 576 pixels
- 576–768 pixels
- 768–992 pixels
- 992–1200 pixels
- Larger than 1200 pixels
Once a container is in place, other Bootstrap layout components implement a CSS grid layout through defining rows and columns.
- Otto, Mark (December 21, 2018). "Bootstrap 4.2.1".
- "Search · stars:>1". GitHub. Retrieved November 14, 2018.
- "Website Traffic, Statistics and Analytics - Alexa". www.alexa.com. Retrieved 2019-03-22.
- Otto, Mark (January 17, 2012). "Bootstrap in A List Apart No. 342". Mark Otto's blog. Archived from the original on October 28, 2016. Retrieved February 23, 2017.
- Otto, Mark (August 19, 2011). "Bootstrap from Twitter". Developer Blog. Twitter. Archived from the original on February 23, 2017. Retrieved February 23, 2017.
- "About". Bootstrap. Retrieved February 23, 2017.
- Otto, Mark (January 31, 2012). "Say hello to Bootstrap 2.0". Developer Blog. Twitter. Archived from the original on February 23, 2017. Retrieved February 23, 2017.
- Otto, Mark (August 19, 2013). "Bootstrap 3 released". Archived from the original on October 23, 2016. Retrieved February 23, 2017.
- Otto, Mark (October 29, 2014). "Bootstrap 3.3.0 released". Archived from the original on July 24, 2016. Retrieved February 23, 2017.
- Otto, Mark (August 19, 2015). "Bootstrap 4 alpha". Archived from the original on January 23, 2017. Retrieved February 23, 2017.
- Otto, Mark; Thornton, Jacob (2017-08-10). "Bootstrap 4 Beta". Retrieved 2017-08-16.
- contributors, Mark Otto, Jacob Thornton, and Bootstrap. "Bootstrap 4". blog.getbootstrap.com. Retrieved 2018-03-16.
- "Supported browsers". Bootstrap. Retrieved February 23, 2017.
- contributors, Mark Otto, Jacob Thornton, and Bootstrap (2018-12-21). "Bootstrap 4.2.1". Bootstrap Blog. Retrieved 2019-03-22.
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