Bootstrap v4.0.0

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                　　Bootstrap v4.0.0-alpha.4 发布了，这个版本主要的变化是用一个小的"alpha patch" 来命名一个没有任何JS文件的npm包，并且对我们的 CSS 和 docs 进行了一些小小的改变。
CSS

• 　　#20130: Make .bg-inverse use the background variant mixin for proper text color.
  
• 　　#20333: Update progress bar to use $progress-border-radius instead of $border-radius.
  
• 　　#20387: Use $input-border-radius-* variables on .input-group-addons instead of $border-radius.
  
• 　　#20413: Remove unused $size parameter from grid mixin.
  
• 　　#20447: Make cards block level in columns.
  
• 　　#20469: Remove non ASCII character from table CSS.
  
• 　　#20485: Use rem units on Alert's dismiss icon.
  
• 　　#20545: Removed the inconsistent margins between flex and non-flex modes from .media. Replaced them with spacing utils in our docs examples.
  
• 　　#20597: Removed unused variables in some grid mixins.
  
• 　　#20619: Ensure hover effects work on text utilities.
  
• 　　#20629: Update form checkbox and radio styles for validation; tweak docs to match.
  

Docs

• 　　#20282: Fix typo in Migration docs about Reboot and unit changes.
  
• 
  　　#20341: Update static tooltip demo in docs to use proper>
  
• 　　#20417: Import the flexbox utilities into the docs flex stylesheet to fix broken flex utility docs.
  
• 　　#20475: Update flexbox grid docs to show auto-sizing of sibling columns when using a centered, odd-count column.
  
• 　　#20476: Remove CDN coming soon notice from docs page.
  
• 　　#20484, #20489: Fix segmented button in input group examples.
  
• 　　#20505: Update migration guidelines for renamed table variants.
  
• 　　#20519: Add migration note about .panel-group.
  
• 　　#20551: Ensure progress component table of contents renders.
  
• 
  　　#20553: Properly>
  

Packaging

• 　　#20385, #20418: Fix for npm not having a JS directory.
  
• 　　#20394: Point package.json's main to proper JS file for package managers.
  

　　下载地址：bootstrap-4.0.0-alpha.4-dist.zip