Early Days for CSS Scoping

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There may be a working draft spec for CSS scoping now, a newsworthy occasion for the W3C. Apart from a bizarre interval the place <model scoped> shipped after which was subsequently faraway from the spec (and browsers), that is the furthest a scoping proposal has gotten (the Stage 1 spec by no means obtained anyplace).

This one comes from Miriam Suzanne.

The fundamentals:

<div class=”media”>
<img alt=”Correct alt.” src=”…”>
<div class=”content material”>
<p>…</p>
</div>
</div>

If I’m considering of this little bit of HTML as a “element”, it’s good to have the ability to write types for it which might be very explicitly only for it. That’s what @scope is for, so…

@scope (.media) {
:scope {
show: grid;
grid-template-columns: 50px 1fr;
}
img {
filter: grayscale(100%);
border-radius: 50%;
}
.content material { … }
}

What I like about that’s:

This little bit of CSS may be very explicitly for this media element. It reads like that and may be maintained like that.I didn’t should give you a reputation and sophistication for the <img>. I’m making use of styling there with out it “leaking out” to different photos.

However wait, isn’t this identical to prepending selectors with the mum or dad class?

It sort of is… like we might additionally write:

.media {
}
.media img {
}
.media content material {
}

And now we’ve scoped issues inner to the media element. That’s fairly repetitive, however with native CSS nesting on the way in which, it’s simply this:

.media {
img {
}
.content material {
}
}

So sure, I’d say nesting takes care of some fundamental forms of scoping, however there are some issues which might be very distinctive to this new scope proposal.

One distinctive characteristic is “donut scope”, which means I cease the scoping the place I wish to. Perhaps I would like my scoping to cease at a specific class:

@scope (.media) to (.content material) {
p { }
}

Now I can write types that received’t mess with areas that I don’t need them to mess with, maybe:

<div class=”media”>
<img alt=”Correct alt.” src=”…”>
<p>That is stylable in scope.</p>
<div class=”content material”>
<p>That is NOT styleable in scope.</p>
</div>
</div>

However that’s not the one distinctive downside this new spec solves. I believe the “nearest ancestor” state of affairs that Miriam lays out is probably probably the most fascinating factor. I’ll ship you over to the weblog submit to examine that — it’s fairly wild that we don’t have device for that but.

There’s a lot to wrap your thoughts round right here, particularly as you consider extra advanced conditions like a number of overlapping scopes and the way the nesting syntax may interaction with scoping. Fortuitously, Miriam is running a blog these items very clearly.

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