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[css-view-transitions-2] CSSViewTransitionRule.navigation returns an empty string for invalid/missing descriptor #10766

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Aug 21, 2024
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[css-view-transitions-2] CSSViewTransitionRule.navigation returns an empty string for invalid/missing descriptor #10766

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15 changes: 12 additions & 3 deletions css-view-transitions-2/Overview.bs
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Expand Up @@ -442,20 +442,29 @@ Note: this needs to be cached in the boolean because the result needs to be read
via the URL address bar or clicking a bookmark, as well as any form of user or script initiated {{NavigationType/reload}}.
</dl>

This at-rule conforms with the forward-compatible parsing requirement of CSS;
conformant parsers that don't understand these rules will ignore them without error.
Any descriptors that are not recognized or implemented by a given user agent,
or whose value does not match the grammars given here or in a future version of this specification,
must be ignored in their entirety;
they do not make the ''@view-transition'' rule invalid.

### Accessing the ''@view-transition'' rule using CSSOM ### {#cssom}

The {{CSSViewTransitionRule}} represents a ''@view-transition'' rule.

<xmp class=idl>
enum ViewTransitionNavigation { "auto", "none" };

[Exposed=Window]
interface CSSViewTransitionRule : CSSRule {
readonly attribute ViewTransitionNavigation navigation;
readonly attribute CSSOMString navigation;
[SameObject] readonly attribute FrozenArray<CSSOMString> types;
};
</xmp>

The {{CSSViewTransitionRule/navigation}} getter step is to return the value of the corresponding ''@view-transition/navigation'' descriptor if one exists, otherwise the empty string.

The {{CSSViewTransitionRule/types}} getter steps is to return the value of the corresponding ''@view-transition/types'' descriptor if one exists, otherwise an empty [=list=].

# Selective view transitions # {#selective-vt}

## Overview ## {#selective-vt-overview}
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