CSS custom properties don't work in media queries. Custom media queries could help out here but unfortunately, they're not supported yet.
Oh snap... Something got lost. Check some dogs in the meantime!
em and strong elements are not announced by assistive technologies such as screen readers.
The HTMLInputElement has a lot of properties that you might now use every day or even have heard of. This article describes defaultValue, indeterminate and selection properties.
How to use 'git status --short/-s' to get shorter and easier to grasp status information but 'git status --porcelain' when you build automation with it.
Use Twitter's "hidden" embed API to statically prerender Tweets on your sites.