Shadow Roots and Inheritance

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There’s a helluva gotcha with styling a <particulars> ingredient, as documented right here by Kitty Guiraudel. It’s obscure sufficient that you just would possibly by no means run into it, however in the event you do, I might see it being very complicated (it will confuse me, a minimum of).

Maybe you’re conscious of the shadow DOM? It’s talked about loads when it comes to net elements and comes up when pondering when it comes to <svg> and <use>. However <particulars> has a shadow DOM too:

<particulars>
#shadow-root (user-agent)
<slot identify=”user-agent-custom-assign-slot” id=”details-summary”>
<!– <abstract> reveal –>
</slot>
<slot identify=”user-agent-default-slot” id=”details-content”>
<!– <p> reveal –>
</slot>

<abstract>System Necessities</abstract>
<p>
Requires a pc operating an working system. The pc should have some
reminiscence and ideally some type of long-term storage. An enter gadget as nicely
as some type of output gadget is really helpful.
</p>
</particulars>

As Amelia explains, the <abstract> is inserted within the first shadow root slot, whereas the remainder of the content material (known as “gentle DOM”, or the <p> tag in our case) is inserted within the second slot.

The factor is, none of those slots or the shadow root are matched by the common selector *, which solely matches parts from the sunshine DOM. 

So the <slot> is type of “in the best way” there. That <p> is definitely a toddler of the <slot>, in the long run. It’s additional bizarre, as a result of a selector like particulars > p will nonetheless choose it simply nice. Presumably, that selector will get resolved within the gentle DOM after which continues to work after it will get slotted in.

However in the event you inform a property to inherit, issues break down. In case you did one thing like…

<div>
<p></p>
</div>

div {
border-radius: 8px;
}
div p {
border-radius: inherit;
}

…that <p> goes to have an 8px border radius.

However in the event you do…

<particulars>
<abstract>Abstract</abstract>
<p>Lorem ipsum…</p>
</particulars>

particulars {
border-radius: 8px;
}
particulars p {
border-radius: inherit;
}

That <p> goes to be sq. as a sq. doorknob. I assume that’s both as a result of you may’t drive inheritance by way of the shadow DOM, or the inherit solely occurs from the father or mother which is a <slot>? Regardless of the case, it doesn’t work.

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