Sass 3.4.20 发布，更新如下： Fix a bug with the rounding changes from 3.4.14 and 3.4.15 where some negative numbers would incorrectly be rounded up instead of down. Better compression for :nth pseudoselectors with subtraction.Issue #1650 Add support for the new supports() clause for CSS @import directives. Rounding numbers now respects Sass's precision setting for numbers very close to half an integer. Add support for the q unit, representing one quarter of a millimeter. Mitigate a race condition when multiple threads are using the sameSass:lugin object at once. In compressed mode, numbers between -1 and 1 now have the leading 0 omitted. Source maps now include source ranges for comments. 详情请看：changelog 下载页面：3.4.20 Sass 扩展了 CSS3，增加了规则、变量、混入、选择器、继承等等特性。Sass 生成良好格式化的 CSS 代码，易于组织和维护。 Sass 3.4.20 发布，CSS 框架下载地址
