https://drafts.csswg.org/css-view-transitions-1/#snapshot-containing-block-concept says:

The snapshot containing block is considered to be an absolute positioning containing block and a fixed positioning containing block for ::view-transition and its descendants.

Then https://drafts.csswg.org/css-view-transitions-1/#ua-styles:

:root::view-transition { position: fixed; inset: 0; }

but afaict that position: fixed is just confusing, and behaving exactly the same as position: absolute, since the snapshot CB is a position: fixed containing block, right?

Should we change it just for clarity? Is it just an historical artifact?

cc @noamr @BorisChiou @vmpstr