A new CSS with :where() and :is() pseudo-classes. I better know some of you don't know about these Selector/Pseudo-classes. They were recently introduced to most browsers. But they just might be your new favourite thing in Vanilla CSS.

Let's see about them.

:is()

Think about when you want to apply the same styling to multiple elements in your HTML. You'd probably end up with something that looks like this:

.main h1, 
.main h2, 
.main .heading, {
    line-height: 1.2;
}
.nav l1, 
.nav p {
    padding: 5px 10px;
}

With : is() you can write our CSS in a shorter, quicker and more elegant way.

.main :is(h1, h2, .heading) {
    line-height: 1.2;
}
.nav :is(li, p) {
    padding: 5px 10px;
}

Imagine all the many lines you would have written😂. The pseudo-class function : is() also known as Matches Any takes a selector list and selects any element that can be selected by one of the selectors in that list.

It can also be chained with other selectors such as :not(), :firstchild() etc.

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:where()

Just like :is(), :where() takes a selector list as its argument and selects any element that can be selected by one of the selectors in that list.

.main h1, 
.main h2, 
.main .heading, {
    line-height: 1.2;
}
.nav l1, 
.nav p {
    padding: 5px 10px ;
}

After using :where()

.main :where(h1, h1, .heading) {
    line-height: 1.2;
}
.nav :where(li, p) {
    padding: 5px 10px;
}

You may have thought this looks the same. Yes, it looks. So what's the difference?

Specificity

:is() takes the specificity of its most specific selector on the other hand :where() has a specificity of 0.

It's important to keep this small yet very important detail in mind when you're using :is() and :where() in your code to avoid blocking yourself from applying CSS changes in other places.

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