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： 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。 删除 .col-form-legend 类，将其样式合并到 .col-form-label 类中。 其他： Restored cursor: pointer to 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. 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_modules folder, 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。 下载地址： Source code (zip) Source code (tar.gz) Bootstrap v4.0.0-beta.3 发布，Web 前端 UI 框架下载地址
