Bootstrap 4.0.0-alpha.2 發布

Bootstrap是快速開發Web應用程序的前端工具包。它是一個CSS和HTML的集合，它使用了最新的瀏覽器技術，給你的Web開發提供了時尚的版式，表單，buttons，表格，網格系統等等。

• Overhauled spacing utilities to use a numerical tiering (to avoid confusion with grid tiers).

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• Continued refactoring efforts to replace markup-specific selectors with classes across several components (including pagination, lists, and more). Still more to do here with additional components.

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• 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.

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• Reverted .0625rem width borders to 1px for more consistent component borders that avoid zoom and font-size bugs across browsers.

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• Renamed .img-responsive to .img-fluid to avoid future confusion on the various responsive image solutions out there.

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• Replaced ZeroClipboard with clipboard.js for Flash-independent copy buttons.

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• Inputs and buttons now share the same border variable to ensure components are always sized similarly.

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• Updated all pseudo-element selectors to use the spec’s preferred double colon (e.g., ::before as opposed to :before).

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• Cards now have outline variants and mixins to support extending base classes further.

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• Utility classes for floats and text alignment now have responsive ranges. This means we’ve dropped the none-responsive classes to avoid duplication.

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• Added support for jQuery 2.

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• And hundreds more Sass improvements, bug fixes, documentation updates, and more.

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  詳情請看：blog post

  下載地址：v4.0.0-alpha.2

   
  
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