Source/WebCore/css/viewTransitions.css

/*
 * Copyright (C) 2023 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

:root {
    view-transition-name: root;
}

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

:root::view-transition-group(*) {
    position: absolute;
    top: 0;
    left: 0;

    animation-duration: 0.25s;
    animation-fill-mode: both;
}

:root::view-transition-image-pair(*) {
    position: absolute;
    inset: 0;
}

:root::view-transition-old(*),
:root::view-transition-new(*) {
    position: absolute;
    inset-block-start: 0;
    inline-size: 100%;
    block-size: auto;
}

:root::view-transition-image-pair(*),
:root::view-transition-old(*),
:root::view-transition-new(*) {
    animation-duration: inherit;
    animation-fill-mode: inherit;
    animation-delay: inherit;
    animation-timing-function: inherit;
    animation-iteration-count: inherit;
    animation-direction: inherit;
    animation-play-state: inherit;
}

/* Default cross-fade transition */
@keyframes -ua-view-transition-fade-out {
    to { opacity: 0; }
}
@keyframes -ua-view-transition-fade-in {
    from { opacity: 0; }
}

/* Keyframes for blending when there are 2 images */
@keyframes -ua-mix-blend-mode-plus-lighter {
    from { mix-blend-mode: plus-lighter }
    to { mix-blend-mode: plus-lighter }
}