Bootstrap 4.0.0
欢迎加入运维网交流群:263444886Bootstrap 4.0.0-alpha.2 发布，更新如下：
[*] Overhauled spacing utilities to use a numerical tiering (to avoid confusion with grid tiers).
[*] Continued refactoring efforts to replace markup-specific selectorswith>Still more to do here with additional components.
[*] Reverted media queries and grid containers from rems to pixels as viewports are not affected by font-size. See #17403 for details. We’ve got a ton of grid work left, too. Feel free to follow along with #18471.
[*] Reverted .0625rem>1px for more consistent component borders that avoid zoom and font-size bugs across browsers.
[*] Renamed .img-responsive to .img-fluid to avoid future confusion on the various responsive image solutions out there.
[*] Replaced ZeroClipboard with clipboard.js for Flash-independent copy buttons.
[*]
Inputs and buttons now share the same border variable to ensure components are always>
[*] Updated all pseudo-element selectors to use the spec’s preferred double colon (e.g., ::before as opposed to :before).
[*]
Cards now have outline variants and mixins to support extending base>
[*] Utility>This means we’ve dropped the none-responsive>
[*] Added support for jQuery 2.
[*] And hundreds more Sass improvements, bug fixes, documentation updates, and more.
详情请看：blog post
下载地址：v4.0.0-alpha.2
Bootstrap是快速开发Web应用程序的前端工具包。它是一个CSS和HTML的集合，它使用了最新的浏览器技术，给你的Web开发提供了时尚的版式，表单，buttons，表格，网格系统等等。
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