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[css-view-transitions-1] What's the point of position: fixed in ::view-transition? #12116
Description
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?
Activity
css-meeting-bot commentedon Aug 19, 2025
The CSS Working Group just discussed
[css-view-transitions-1] What's the point of position: fixed in `::view-transition`?, and agreed to the following:RESOLVED: `::view-transition` pseudo-element uses `position: absolute` instead `position: fixed` in the UA stylesheetThe full IRC log of that discussion
<ntim> emilio: basically the UA stylesheet has a rule where the VT pseudo is position: fixed<ntim> emilio: a bit odd because the snapshot containing block per-spec is a fixedpos CB as well
<ntim> emilio: so that means abspos and fixpos are identical
<ntim> ...Is there anything I'm missing or should it be abspos?
<ntim> flackr: how does it work with scroll?
<ntim> emilio: it's the same because snapshot CB is fixed as well
<ntim> noamr: I don't have context
<ntim> noamr/flackr: probably no reason
<ntim> emilio: should we resolve to make it abspos?
<ntim> noamr: lets do it
<ntim> RESOLVED: `::view-transition` pseudo-element uses `position: absolute` instead `position: fixed` in the UA stylesheet
<ntim> flackr: might have to be `!important` for scoped VT
<flackr> s/`!important`/important
[css-view-transitions-1] Use `position: absolute` instead of `positio…
[css-view-transitions-1] Use `position: absolute` instead of `positio…
VT: Change ::view-transition to be position absolute.