Bootstrap is a simple, intuitive and powerful front-end development framework developed based on HTML, CSS, and JavaScript in collaboration with designers Mark Otto and Jacob Thornton of the American Twitter company, making the Web Development is faster.
Bootstrap provides elegant HTML and CSS specifications, which are written in the dynamic CSS language Less.(Recommended learning: Bootstrap video tutorial) Bootstrap has been very popular since its launch and has been a popular open source project on GitHub, including NASA's MSNBC (Microsoft National Broadcasting Company) Breaking News has used this project.
Some frameworks that are familiar to domestic mobile developers, such as the WeX5 front-end open source framework, are also performance optimized based on the Bootstrap source code.
In late January 2018, the Bootstrap team released the official version of Bootstrap 4. The main changes in 4 include the following aspects:Migrated from Less to Sass
Improved grid system
Default flexbox support
Dropped wells, thumbnails, and panels for cards
Merge all HTML resets into a new module :Reboot
New customization options
No longer supports IE8
Rewrite all JavaScript plug-ins
Improve automatic positioning of tool tips and popovers
Improved documentation
Many other improvements
Less is a CSS preprocessor that makes CSS dynamic. Bootstrap, on the other hand, is a toolkit for rapid development of Web Apps and sites. This way, you can use Bootstrap’s Less variables, mixins, and nesting in CSS.
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