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[css-view-transitions-2] Generated strings start with -ua- #12238

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May 28, 2025
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[css-view-transitions-2] Generated strings start with -ua- #12238

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6 changes: 2 additions & 4 deletions css-view-transitions-2/Overview.bs
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Expand Up @@ -815,14 +815,12 @@ To resolve the [=used value=] of 'view-transition-name' for |element|:
1. If |computed| is <css>none</css>, return null.
1. If |computed| is a <<custom-ident>>, return |computed|.
1. Assert: |computed| is <css>auto</css> or <css>match-element</css>.
1. If |computed| is <css>auto</css>, |element| has an associated [=Element/id=], and |computed| is associated with the same [=tree/root=] as |element|'s [=tree/root=], then return a unique string.
1. If |computed| is <css>auto</css>, |element| has an associated [=Element/id=], and |computed| is associated with the same [=tree/root=] as |element|'s [=tree/root=], then return a unique string starting with "<code>-ua-</code>".
Two elements with the same [=Element/id=] must return the same string, regardless of their [=node document=].

Note: this means that a ''::part()'' pseudo-element wouldn't resolve to its matching element's [=Element/id=].

1. Return a unique string. The string should remain consistent and unique for this element and {{Document}}, at least for the lifetime of |element|'s [=node document=]'s [=active view transition=].

Note: this string is not web-observable, and is used for addressing the element in internal algorithms.
1. Return a unique string starting with "<code>-ua-</code>". The string should remain consistent and unique for this element and {{Document}}, at least for the lifetime of |element|'s [=node document=]'s [=active view transition=].

Note: When used in a cross-document view transition, generated <css>auto</css> values never match, resulting in separate ''::view-transition-group()'' pseudo-elements, one exiting and one entering.

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