Bootstrap v4.0.0-beta.2 published, web front-end UI framework
May 04, 2021
Bootstrap
Bootstrap v4.0.0-beta.2 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。
此次更新的亮点有：
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Improved Sass map customization with #23260.
With this change, it's now possible to override specific key value pairs instead of resetting the entire map, ideal for color scheme customization.
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Restored grid .offset- modifiers in #23445.
Originally our intent was to supplement this with our margin utilities, but we underestimated the appeal of fixed number column offsets.
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Remove unnecessary color from .badge, and it's associated $badge-color variable, in #23529.
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Rename grayscale function to gray to avoid breaking CSS native grayscale filter in #23579.
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Renamed .table-inverse, .thead-inverse, and .thead-default to .*-dark and .*-light, matching our color schemes used elsewhere in #23560.
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Responsive tables now generate classes for each grid breakpoint, meaning we've added .table-responsive-{sm,md,lg,xl} to the already present .table-responsive.
You might need to adjust your usage depending on when you want a table to resize.
See #22804.
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Include two new dist files which contain Popper.js inside bootstrap.bundle.js and bootstrap.bundle.min.js.
See #23735.
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Dropped support for Bower as they've deprecated the package manager.
See #23568.
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Switched breadcrumbs from float to flexbox in #23683.
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Added new CSS variables in #23761.
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Switched to Stylelint in #23572.
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New Theming page in the docs from #23611
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#23943: Changed the color-yiq from a mixin that included the color property to a function that returns a value, allowing you to use it for any CSS property.
For example, instead of color-yiq(#000), you'd write color: color-yiq(#000);.
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New and improved theming in #24429.
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