This would be such a great addition to CSS—a parent/ancestor selector!
With the combined might of :has(), :not(), nth-child(), and calc(), CSS has become a powerful language for specifying rules to account for all kinds of situations.
This is a great explanation of the difference between the [lang] and :lang CSS selectors. I wouldn’t even have thought’ve the differences so this is really valuable to me.
In which Matthew disects a multiple choice quiz that uses CSS to do some clever logic, using the :checked pseudo-class and counter-increment.
Oh, and this is how he realised it wasn’t using JavaScript:
I have JavaScript disabled on my phone because a) it cuts out most of the ads, b) it cuts out lots of bandwidth and I have a limited data plan, and c) my battery lasts longer because it’s not processing tons of code to show me some text (cough, Medium).
A really deep dive into the lang attribute, and the :lang() pseudo-class (hitherto unknown to me). This is all proving really useful for a little side project I’m working on.
A deep dive into the :focus pseudo-class and why it’s important.
A really interesting proposal from Lea that would allow CSS authors to make full use of selectors but without increasing specificity. Great thoughts in the comments too.
An alternative to using the :checked pseudo-class for sprinkling in some behaviour—you can use the :target pseudo-class. It might mess up the browser history though.
Here’s a really nifty use of the :checked behaviour pattern that Charlotte has been writing about—an interface for choosing a note from a piano keyboard. Under the hood, it’s a series of radio buttons and labels.