daniel-c-harvey
88 lines
1.8 KiB
CSS
88 lines
1.8 KiB
CSS
@property --parallax-pos {
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syntax: '<percentage>';
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inherits: true;
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initial-value: 0%;
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}
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.parallax-window {
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position: relative;
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overflow: hidden;
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height: var(--window-height, 300px);
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width: 100%;
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}
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.parallax-window.full-width {
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width: 100vw;
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position: relative;
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left: 50%;
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right: 50%;
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margin-left: -50vw;
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margin-right: -50vw;
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}
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.layer {
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position: absolute;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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background-repeat: no-repeat;
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background-position: 50% var(--parallax-pos, 50%);
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}
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.layer-1 {
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opacity: 1;
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}
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.layer-2 {
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opacity: 0;
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transition: opacity 400ms ease;
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}
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.parallax-window:hover .layer-2 {
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opacity: 1;
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}
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/*
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* Cascade interaction for --parallax-pos:
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*
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* Before WASM (SSR / hydration):
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* @property initial-value: 0%
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* → CSS animation (view timeline) overrides → correct position from scroll
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*
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* After WASM (JS running):
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* JS element.style.setProperty('--parallax-pos', ...) [inline style]
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* → inline style beats animation → JS takes over seamlessly
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*
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* prefers-reduced-motion:
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* animation: none → @property initial-value 0% used → static image
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* JS also skips scroll listener
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*/
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@supports (animation-timeline: view()) {
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@keyframes parallax-pan {
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from { --parallax-pos: var(--parallax-from, 0%); }
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to { --parallax-pos: var(--parallax-to, 0%); }
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}
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.parallax-window {
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animation: parallax-pan linear both;
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animation-timeline: view();
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}
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@media (prefers-reduced-motion: reduce) {
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.parallax-window {
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animation: none;
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}
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}
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}
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@media (prefers-reduced-motion: reduce) {
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.parallax-window {
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--parallax-pos: 0%;
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}
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.layer-2 {
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transition-duration: 0ms;
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}
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}
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