Bootstrap v4.0.0-beta.3 发布了，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。
主要更新内容如下：
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重写本机和自定义检查控件。Both browser default and custom checkboxes and radios now have simpler markup after removing the
<input>from the<label>. Now, all checkboxes and radios have a parent<div>and sibling<input>and<label>pair. This is essential for form validation and disabled inputs because we can use the input's state to style the label.In addition, custom checkbox and radio elements no longer have a
.custom-control-indicator. This is generated from the new.custom-control-label. -
重写输入组：
input-group-{prepend|append}类，新的方法允许我们支持输入组中的验证样式和消息，同时也增加了对自定义选择，自定义文件输入和多个.form-controls的支持。 -
响应表也是父类，以避免更改<table>的显示时的可访问性问题。
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删除 .col-form-legend 类，将其样式合并到 .col-form-label 类中。
其他：
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Restored
cursor: pointerto non-disabled links, buttons,.close, navbar toggler, and pagination links. -
Added a new vertically centered modal option with
.modal-dialog-centered. -
Added new dropleft and dropright variants for dropdowns in #23860 .
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Our npm package no longer includes any files other than our source and dist JavaScript and CSS files. If you previously relied on our running our scripts via the
node_modulesfolder, you'll need to update your build tools. -
Print styles have moved to bottom of the import stack to properly override styles.
更新详情请看 这里 。
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