CSS :is

By  on  

There are scores of developers who hate CSS; don't get it, don't want to get it, etc. Most of that is either down to inefficiencies within the language or misunderstanding of how to properly construct a website structure. I mostly love CSS but there are some parts of the language that I always hated, like having to repeat very similar selectors. That's why I was so happy when I saw CSS :is ; a method of avoid duplication within your selector structure!

You all remember this mindless CSS repetition:

section h1,
section h2, 
section h3,
article h1,
article h2,
article h3 {
  /* styles here */
}

I always loathed having to do that -- lots of maintenance cost and bloated CSS files. This is where :is comes to the rescue:

:is(section, article) :is(h1, h2, h3) {
  /* styles here */
}

is: is a perfect summary of how a tiny addition to the CSS language can make a developer's life just a bit easier!

Recent Features

  • By
    9 Mind-Blowing WebGL Demos

    As much as developers now loathe Flash, we're still playing a bit of catch up to natively duplicate the animation capabilities that Adobe's old technology provided us.  Of course we have canvas, an awesome technology, one which I highlighted 9 mind-blowing demos.  Another technology available...

  • By
    5 HTML5 APIs You Didn’t Know Existed

    When you say or read "HTML5", you half expect exotic dancers and unicorns to walk into the room to the tune of "I'm Sexy and I Know It."  Can you blame us though?  We watched the fundamental APIs stagnate for so long that a basic feature...

Incredible Demos

  • By
    CSS pointer-events

    The responsibilities taken on by CSS seems to be increasingly blurring with JavaScript. Consider the -webkit-touch-callout CSS property, which prevents iOS's link dialog menu when you tap and hold a clickable element. The pointer-events property is even more JavaScript-like, preventing: click actions from doing...

  • By
    Chris Coyier’s Favorite CodePen Demos

    David asked me if I'd be up for a guest post picking out some of my favorite Pens from CodePen. A daunting task! There are so many! I managed to pick a few though that have blown me away over the past few months. If you...

Discussion

  1. Rahul Kumar

    There is two important facts about :is() :-

    1. If one/more selectors passed in it, are invalid then parser will still parse the entire code and apply the mentioned styles to other selectors except the invalid ones.

    2. It does not work with pseudo elements.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!