Conditions for CSS Variables
"I'll start from this: there are no (There is a module named “CSS Conditional Rules”, but don't expect it to cover the CSS variables — it covers some at-rules stuff. There is even a proposal for @when/@else at-rules, which, again, do not anything in common with variables.) conditions in specs to use with CSS variables."
Variable Fonts on the Web | WebKit
"Currently, I’ve only implemented the lowest-level font-variation-settings property, but I’m very excited to implement the complete support as soon as I’m able."
A modern CSS reset (with caveats) – Ben Frain
"The first part with the universal selector unsets everything. With just this you will see things like the head displayed on screen."
How and Why You Should Inline Your Critical CSS
"While inlining, stylesheets can be cached. HTML often is not cached (it is often not a good idea to do so!). This means there can occasionally be a difference between the two. Keep this in mind when making updates! Also, the inlined CSS will result in some extra page weight every time a user loads your website."
Tools for Developing Accessible Websites
"Because I do the vast majority of my development in Chrome, this list is biased to tools for Chrome in particular."
Breaking Out With Viewport Units and Calc - Cloud Four
"Viewport units don’t take scrollbar dimensions into account unless you explicitly set overflow values to scroll. But even that doesn’t work in Chrome or Safari"