Re: [csswg-drafts] [css-view-transitions-2] Copying border shape properties to view-transition-group-children (#12357)

The CSS Working Group just discussed `[css-view-transitions-2] Copying border shape properties to view-transition-group-children`, and agreed to the following:

* `RESOLVED: Copy over border-radius and corner-shape to ::view-transition-group-children`

<details><summary>The full IRC log of that discussion</summary>
&lt;emilio> TabAtkins: it's more expensive than it seems to aggregate all the stylesheets in the document up to date, browsers do it lazily for a reason<br>
&lt;TabAtkins> vmpstr: we added ::virew-transition-group pseudo, sized ot the border box of the originating element<br>
&lt;TabAtkins> vmpstr: we copy the used border-width value, with a transparent border, to allow easy clipping if the authors chosoes<br>
&lt;TabAtkins> vmpstr: it clips a square/rect area<br>
&lt;TabAtkins> vmpstr: proposal is we copy the values of the border shaping properties (corner-shape, border-radius) so it matches the element<br>
&lt;TabAtkins> +1<br>
&lt;flackr> +1<br>
&lt;astearns> ack TabAtkins<br>
&lt;astearns> ack fantasai<br>
&lt;TabAtkins> astearns: there was some chatter in the issue about making authors do this themselves, but it seems to me, with chair hat off, that it is a good extension<br>
&lt;TabAtkins> fantasai: how does this play with border-image?<br>
&lt;TabAtkins> vmpstr: the border is transparent right now<br>
&lt;TabAtkins> vmpstr: the author would have to set a border-image themselves to have an effect. it's just shaping the clip area right now<br>
&lt;TabAtkins> flackr: the border image would be capture by the snapshots<br>
&lt;TabAtkins> astearns: if we copy over corner shape by default, and author actually wants the rectangle, they can override it themselves?<br>
&lt;TabAtkins> vmpstr: yes<br>
&lt;TabAtkins> astearns: so proposed resolution is to copy border-radius and corner-shape. is there more?<br>
&lt;TabAtkins> vmpstr: I think that's it<br>
&lt;TabAtkins> vmpstr: possible with a note that this list will extend if we add more properties that would affect the expected clipping region<br>
&lt;TabAtkins> astearns: objections?<br>
&lt;TabAtkins> RESOLVED: Copy over border-radius and corner-shape to ::view-transition-group-children<br>
</details>


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Received on Wednesday, 23 July 2025 16:43:28 UTC