Here are Some Helpful Tools for your CSS code

CSS Triggers is an online resource that informs you of which CSS properties cause layout, paint and composite operations in which browsers. These are processes the browser performs when rendering a webpage.

cssnano is a CSS optimization and minification plugin. There is an online tool here.

This page contains information I gathered and thought were very useful. See more tools.

Just to let you know, this page was last updated Saturday, Jan 16 21