Bootstrap4 首个Beta版发布：距上次发布已7月之久！
北京时间2017年8月12日，Bootstrap 4 的首个 Beta 版终于发布了。此次Beta版本距离上次发布 4.0 的最后一个 alpha 版已经过去了 7 个月。
该版本取消将 Normalize.css 作为依赖关系，而是 fork 其中的一部分并和 Bootstrap 自家的 Reboot 混合，以获得更稳定的标准化方法。还对导航、网格进行了改进以及对 Flexbox 进行一些兼容性的处理。
此外，该版本将 jQuery 和 Popper 移动到了 peerDependencies ，因为它们不是 Bootstrap 每个部分所要求的。往下阅读更多的更新内容。
值得关注的更新：
- Dropped Normalize.css as a dependency, forking some of it and remixing it with our own Reboot for a more stable normalization approach.
- Update navbar responsive behaviors to be mobile first, use a new class name .navbar-expandinstead of .navbar-toggleable, remove toggler position modifiers (relies on flex utils now), and fix a handful of bugs.
- Stabilize some grid behaviors and update the docs.
- Updated the grid to drop push, pull, and offset in favor of new .order- modifiers and margin utilities.
- Renamed tons of variables (see #22414 and #22092) for a more consistent naming scheme.
- Removed remaining cursor: pointers to restore browser defaults and better indicate actions vs hyperlinks.
- Renamed flexbox order utilities to better match utility naming scheme of .property-value.
- Restored Alpha 5's placement of _custom.scss in our import order.
- Rewrote display and responsive utilities to de-dupe a bunch of functionality.
- Removed Gruntfile and docs from package manager builds.
- Overhauled our color system with new Sass maps, variables, classes, and component variants.
- Updated browser support to bring ranges up to more recent versions.
- Added a bash script for linting unused variables.
- Moved jQuery and Popper to peerDependencies as they're not requirements for every part of Bootstrap.
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