Merge pull request #3901 from shaedrich/css-framework

Add topic "CSS Framework"

topics/css-framework/index.md

@@ -0,0 +1,15 @@
+---
+display_name: CSS Framework
+short_description: CSS Frameworks usually offer one or more stylesheets with basic styling/generic components, and many of them use preprocessors.
+topic: css-framework
+related: css, bootstrap, tailwind, zurb-foundation
+wikipedia_url: https://en.wikipedia.org/wiki/CSS_framework
+---
+**CSS Frameworks** offer one or multiple stylesheets from basic styling to generic components to some extent, including but not limited to
+* Reboot (aka "Preflight")
+* Layout (often times "Grid")
+* Forms, Tables, etc.
+* [Typography](https://github.com/topics/typography)
+* [Responsiveness](https://github.com/topics/responsive) (often times including breakpoints and [viewport](https://github.com/topics/viewport))
+
+They often have their own class notation and many use [preprocessors](https://github.com/topics/css-preprocessor) like [Sass](https://github.com/topics/sass), [Less](https://github.com/topics/less) or [Stylus](https://github.com/topics/stylus).