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This article is about what the bootstrap framework is based on. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Bootstrap is a concise, intuitive and powerful front-end development framework developed by Mark Otto and Jacob Thornton of American Twitter company based on HTML, CSS and JavaScript, which makes Web development faster.

Bootstrap provides elegant HTML and CSS specifications, which are written by the dynamic CSS language Less.

Bootstrap has been popular since its launch and has been a hot open source project on GitHub, including NASA's MSNBC (Microsoft National Broadcasting Corporation) Breaking News.

Some frameworks that domestic mobile developers are familiar with, such as the WeX5 front-end open source framework, are also based on Bootstrap source code for performance optimization.

In late January 2018, the Bootstrap team released the official version of Bootstrap 4, and the main changes in 4 include the following:

Migrate from Less to Sass

Improved grid system

Default elastic box support

Dropped wells, thumbnails, and panels for cards

Merge all HTML resets into a new module: Reboot

New customization option

IE8 is no longer supported

Rewrite all JavaScript plug-ins

Improved automatic positioning of tooltips and popovers

Improved documentation

A large number of other improvements

Less is a CSS preprocessor that makes CSS dynamic. Bootstrap, on the other hand, is a toolkit for rapid development of Web App and sites. In this way, you can use Bootstrap's Less variable, mixins (mixed), and nesting (nested) in CSS.

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