Google Chrome 126 is introducing cross-document view transitions in CSS (source) with

@view-transition {
    navigation: auto;
}

Now I would like to check the support of the user’s browser with:

@supports (navigation: auto) {
    --available: true;
}

But testing in Chrome v126 the @supports is not triggered, please see this codepen as an example: https://codepen.io/olvrschwrz/pen/YzoqYYG

I would expect that the @supports (navigation: auto) is evaluated as true in Chrome v126 and onwards.

One could work around and use @supports with selectors ::-view-transition-old(root) and ::view-transition-new(root) but this would not explicitly check on cross-document view transition.