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[css-view-transitions-2] Specify view-transition-nane: match-element #12968

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[css-view-transitions-2] Specify view-transition-nane: match-element #12968

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23 changes: 22 additions & 1 deletion css-view-transitions-2/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -537,14 +537,35 @@ spec:css2; type:dfn; text:viewport
: <dfn>none</dfn>
:: The [=/element=] will not participate independently in a view transition.

: <dfn>match-element</dfn>
:: The [=/element=] will participate in the transition
with a user-agent generated name that is unique to the [=/element=].

<div class="example">
```html
<style>
.card {
view-transition-name: match-element;
}
</style>
<div id=e1 class=card>Card 1</div>
<div id=e2 class=card>Card 2</div>
```
In this example, both `#e1` and `#e2` participate in the transition and match against
themselves: `#e1` matches with `#e1` and `#e2` matches with `#e2` since they have unique
persistent names. In effect, this allows view transition to animate the visual change
in several elements with a simple rule.
</div>


: <dfn><<custom-ident>></dfn>
:: The [=/element=] participates independently in a view transition--
as either an old or new [=/element=]--
with the specified [=view transition name=].

Each [=view transition name=] is a [=tree-scoped name=].

The values <css>none</css>, <css>auto</css>, and <css>match-element</css> are excluded from <<custom-ident>> here.
The values <css>none</css>, and <css>auto</css>, excluded from <<custom-ident>> here.

Note: If this name is not unique
(i.e. if two elements simultaneously specify the same [=view transition name=])
Expand Down