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Bootstrap 3 is the third generation of the front-end framework allowing for speedier web development with an attractive look and feel. Use with the [twitter-bootstrap] tag

Presentation

Bootstrap 3
Sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.

Current version: Bootstrap v3.4.0

Backwards compatibility

Bootstrap 3 is not backwards compatible with v2.x. To learn about major changes, novelties and removals, please have a look on the Bootstrap migrating guide from 2.x to 3.

What's new?

new flat design and an optional theme
new Customizer
better box model by default
reviewed grid system (mobile-first, classes for phones, tablets, desktops, and large desktops)
JavaScript plugins rewritten
new Glyphicons icon font
better navbar (now responsive and with subcomponents)
better modals (for responsive websites)
new components (panel, list-groups)
a few components removed (accordion, submenus, typeahead)
more consistent base and sizing classes
better documentation
dropped Internet Explorer 7 and Firefox 3.6 support

See all details in the Bootstrap 3 release notes.

Bootstrap for Sass

You can find a Sass-powered (official) version of Bootstrap, ready to drop right into your Sass powered applications.

See the Bootstrap for Sass Github page.

Tools to test bootstrap code:

Reducing Payload

The default bootstrap.min.js and bootstrap.min.css files can be reduced in size by including only the components you use.

Another option is to use tools to remove unused CSS selectors. To learn more about task runners and build automation check out Grunt.js and the Grunt unCSS plugin.