Day 54: testing for the support of a selector

posted on

It’s time to get me up to speed with modern CSS. There’s so much new in CSS that I know too little about. To change that I’ve started #100DaysOfMoreOrLessModernCSS. Why more or less modern CSS? Because some topics will be about cutting-edge features, while other stuff has been around for quite a while already, but I just have little to no experience with it.

Support for a CSS property isn’t the only thing you can check with @supports(), you can also check support for a selector.

I knew you can check whether a property is supported by the current browser and apply styles accordingly. 

<div hidden class="grid">
  Your browser supports <code>display: grid</code> 🎉
</div>
@supports (display: grid) {
  .grid {
    display: block
  }
}

What I didn’t know is that you can do the same, but for a selector using the selector() function.

<div hidden class="has">
  Your browser supports <code>:has()</code> 🎉
</div>
@supports selector(:has(a)) {
  .has {
    display: block
  }
}

You can also reverse the query.

@supports not selector(:has(a)) {
  /* You're Firefox, Opera Mini, etc. fallback */
}

See on CodePen

Further reading

Do you want to learn even more awesome CSS?

I'm running a workshop with my friends at Smashing Magazine in which I introduce you to the most useful modern features in CSS and show how you can implement them today in your code base to improve scalability, maintainability, and productivity.

Learn more about the workshop!

Overview: 100 Days Of More Or Less Modern CSS