css pseudo element
`::view-transition-image-pair()` CSS pseudo-element
The ::view-transition-image-pair() CSS pseudo-element represents a container for a view transition’s “old” and “new” view states — before and after the transition.
During a view transition, ::view-transition-image-pair() is included in the associated pseudo-element tree as explained in The view transition pseudo-element tree. It is only ever a child of a ::view-transition-group(). In terms of children, it can have a ::view-transition-new() or a ::view-transition-old(), or both.
::view-transition-image-pair() is given the following default styling in the UA stylesheet:
:root::view-transition-image-pair(*) {
position: absolute;
inset: 0;
animation-duration: inherit;
animation-fill-mode: inherit;
animation-delay: inherit;
}
During a view transition, ::view-transition-image-pair() has isolation: isolate set on it in the view transition style sheet so that its children can be blended with non-normal blend modes without affecting other visual outputs.
Syntax
::view-transition-image-pair([ <pt-name-selector> <pt-class-selector>? ] | <pt-class-selector>) {
/* ... */
}
Parameters
*- : The universal selector (
*); selects all view transition groups on a page.
- : The universal selector (
root- : Causes the pseudo-element to match the default
rootview transition snapshot group created by the user agent to contain the view transition for the overall page. This group includes any element not assigned to its own specific view transition snapshot group via theview-transition-nameproperty.
- : Causes the pseudo-element to match the default
<pt-name-selector>- : The
custom-identset as the value of theview-transition-nameproperty.
- : The
<pt-class-selector>- : The
custom-identset as the value of theview-transition-classproperty preceded by a period (.).
- : The
Examples
::view-transition-image-pair(root) {
isolation: auto;
}
::view-transition-image-pair(.card) {
isolation: isolate;
}