Re: [csswg-drafts] [css-overflow-5] Enforce layout containment on ::scroll-marker-group (#11708)

The CSS Working Group just discussed `[css-overflow-5] Enforce layout containment on ::scroll-marker-group`, and agreed to the following:

* `RESOLVED: ::scroll-marker-group gainst "contain: layout !important" in the UA style sheet`

<details><summary>The full IRC log of that discussion</summary>
&lt;TabAtkins> flackr: we're proposing to enforce layout containment on scorll-marker-group. it avoids a lot of complex situations<br>
&lt;TabAtkins> flackr: like having intruding flaots, or abspos on a scroll marker resulting in it not being in the group<br>
&lt;TabAtkins> flackr: doesn't seem like there's a strong use-case to *not* have layout containment<br>
&lt;TabAtkins> flackr: and just less surprising in general to have it<br>
&lt;fantasai> TabAtkins: we already partially relaxed the size containment, right?<br>
&lt;TabAtkins> flackr: yup<br>
&lt;TabAtkins> astearns: only reason to not do it that i can think of is it's just yet anohter thing that changes the value of properties wihtout being explicitly set<br>
&lt;TabAtkins> astearns: sometimes hard to teach<br>
&lt;TabAtkins> flackr: i think we can set this in the UA style for ::scroll-marker-group<br>
&lt;TabAtkins> fantasai: would that be !important<br>
&lt;TabAtkins> flackr: yes<br>
&lt;TabAtkins> TabAtkins: and would then show up in devtools<br>
&lt;TabAtkins> astearns: so proposal is we set size containment for scorll-marker-groups as !important in the UA sheet<br>
&lt;TabAtkins> RESOLVED: ::scroll-marker-group gainst "contain: layout !important" in the UA style sheet<br>
</details>


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Received on Wednesday, 2 April 2025 15:58:34 UTC