scroll-reveal滚动揭示
内容进入视口时触发一次轻量展示，并支持减少动态偏好。
预览
元素进入视口时淡入或滑动到位。
标准减弱
标准减弱
预览
滚动
滚动揭示
继续
实现「滚动揭示」：内容进入视口时触发一次轻量展示，并支持减少动态偏好。 参数设为时长 260ms、触发阈值 20%、位移 28px、曲线 soft。由视口进入或滚动进度驱动。使用语义化 HTML，CSS 作用域限定在 .motion-demo--scroll-reveal。为 prefers-reduced-motion 和 .force-reduced-motion 提供等价的低动态方案。
<div class="motion-demo motion-demo--scroll-reveal" data-motion="scroll-reveal" aria-label="滚动揭示 示例">
<div class="motion-scroll-track"><span>滚动</span><article class="motion-surface">
<strong>滚动揭示</strong>
<span class="motion-line"></span>
<span class="motion-line"></span>
</article><span>继续</span></div>
</div>.motion-demo.motion-demo--scroll-reveal {
box-sizing: border-box;
position: relative;
display: grid;
place-items: center;
width: min(100%, 34rem);
min-height: 15rem;
padding: 2rem;
overflow: hidden;
color: #18181b;
background: #fafafa;
border: 1px solid #e4e4e7;
border-radius: 16px;
isolation: isolate;
}
.motion-demo.motion-demo--scroll-reveal *, .motion-demo.motion-demo--scroll-reveal *::before, .motion-demo.motion-demo--scroll-reveal *::after {
box-sizing: border-box;
}
.motion-demo.motion-demo--scroll-reveal .motion-surface {
position: relative;
display: grid;
gap: 0.65rem;
width: min(100%, 18rem);
padding: 1.25rem;
background: #ffffff;
border: 1px solid #e4e4e7;
border-radius: 16px;
box-shadow: none;
}
.motion-demo.motion-demo--scroll-reveal .motion-surface strong { font-weight: 500; }
.motion-demo.motion-demo--scroll-reveal .motion-line {
display: block;
width: 100%;
height: 0.5rem;
background: #e4e4e7;
border-radius: 999px;
}
.motion-demo.motion-demo--scroll-reveal .motion-line:last-child { width: 62%; }
.motion-demo.motion-demo--scroll-reveal .motion-button {
position: relative;
min-height: 2.75rem;
padding: 0.75rem 1.1rem;
color: white;
font: inherit;
font-weight: 700;
background: #18181b;
border: 0;
border-radius: 999px;
cursor: pointer;
}
.motion-demo.motion-demo--scroll-reveal .motion-button:focus-visible { outline: 3px solid rgb(37 99 235 / 32%); outline-offset: 3px; }
.motion-demo.motion-demo--scroll-reveal .motion-action-row {
display: flex;
justify-content: center;
gap: 0.5rem;
margin-top: 0.85rem;
}
.motion-demo.motion-demo--scroll-reveal .motion-replay-scene {
width: min(100%, 22rem);
display: grid;
place-items: center;
}
.motion-demo.motion-demo--scroll-reveal .motion-pausable-scene {
width: min(100%, 22rem);
display: grid;
place-items: center;
}
.motion-demo.motion-demo--scroll-reveal button.motion-surface {
color: inherit;
font: inherit;
text-align: start;
cursor: pointer;
}
.motion-demo.motion-demo--scroll-reveal .motion-replay-button,
.motion-demo.motion-demo--scroll-reveal .motion-undo-button,
.motion-demo.motion-demo--scroll-reveal .motion-dismiss-button,
.motion-demo.motion-demo--scroll-reveal .motion-pause-button {
min-height: 2.75rem;
padding: 0.65rem 0.9rem;
color: #18181b;
font: 650 0.78rem/1 ui-sans-serif, system-ui, sans-serif;
background: #ffffff;
border: 1px solid #d4d4d8;
border-radius: 8px;
cursor: pointer;
}
.motion-demo.motion-demo--scroll-reveal .motion-replay-button:focus-visible,
.motion-demo.motion-demo--scroll-reveal .motion-undo-button:focus-visible,
.motion-demo.motion-demo--scroll-reveal .motion-dismiss-button:focus-visible,
.motion-demo.motion-demo--scroll-reveal .motion-pause-button:focus-visible,
.motion-demo.motion-demo--scroll-reveal [data-reorder-item]:focus-visible,
.motion-demo.motion-demo--scroll-reveal [data-swipe-target]:focus-visible {
outline: 3px solid rgb(37 99 235 / 32%);
outline-offset: 3px;
}
.motion-demo.motion-demo--scroll-reveal .motion-status {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
.motion-demo.motion-demo--scroll-reveal .motion-ripple-ink {
position: absolute;
width: 12px;
height: 12px;
pointer-events: none;
background: rgb(255 255 255 / 72%);
border-radius: 50%;
transform: translate(-50%, -50%) scale(0.95);
opacity: 0;
}
.motion-demo.motion-demo--scroll-reveal .motion-state-stack { position: relative; width: min(100%, 18rem); height: 9rem; }
.motion-demo.motion-demo--scroll-reveal .motion-state { position: absolute; inset: 0; display: grid; place-items: center; padding: 1rem; background: #ffffff; border: 1px solid #e4e4e7; border-radius: 16px; }
.motion-demo.motion-demo--scroll-reveal .motion-state--to { background: #18181b; color: white; }
.motion-demo.motion-demo--scroll-reveal .motion-scroll-track > span { color: #71717a; font: 600 0.72rem/1.2 ui-monospace, monospace; letter-spacing: 0.08em; text-transform: uppercase; }
.motion-demo.motion-demo--scroll-reveal .motion-orbit-item { display: grid; place-items: center; width: 2.5rem; height: 2.5rem; color: white; background: #2563eb; border-radius: 50%; }
.motion-demo.motion-demo--scroll-reveal .motion-text-stack { position: relative; width: min(100%, 18rem); min-height: 4rem; }
.motion-demo.motion-demo--scroll-reveal svg { width: min(100%, 20rem); height: auto; }
.motion-demo.motion-demo--scroll-reveal { max-height: 15rem; overflow-x: hidden; overflow-y: auto; place-items: start center; }
.motion-demo.motion-demo--scroll-reveal .motion-scroll-track { display: grid; place-items: center; gap: 10rem; width: 100%; min-height: 48rem; padding-block: 5rem; }
.motion-demo.motion-demo--scroll-reveal .motion-surface { animation: motion-scroll-reveal 260ms cubic-bezier(0.23, 1, 0.32, 1) both; }
@supports (animation-timeline: view()) {
.motion-demo.motion-demo--scroll-reveal .motion-surface { animation-timeline: view(); animation-range: entry 20% cover 55%; }
}
@keyframes motion-scroll-reveal { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: none; } }
@keyframes motion-scroll-reveal-reduced-fade {
from { opacity: 0.84; }
to { opacity: 1; }
}
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal {
animation: motion-scroll-reveal-reduced-fade 160ms cubic-bezier(0.23, 1, 0.32, 1) both !important;
}
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal *,
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal *::before,
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal *::after {
animation: none !important;
animation-delay: 0ms !important;
animation-iteration-count: 1 !important;
transition-property: opacity, color, background-color, border-color !important;
transition-duration: 160ms !important;
transition-delay: 0ms !important;
scroll-behavior: auto !important;
}
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal .motion-button,
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal [data-reorder-item],
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal [data-swipe-target],
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal [data-spring-target] {
transform: none !important;
}
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal .motion-path { stroke-dashoffset: 0 !important; }
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal .motion-word--from { opacity: 0 !important; visibility: hidden; }
.force-reduced-motion .motion-demo.motion-demo--scroll-reveal .motion-word:not(.motion-word--from) { opacity: 1 !important; filter: none !important; transform: none !important; }
@media (prefers-reduced-motion: reduce) {
.motion-demo.motion-demo--scroll-reveal {
animation: motion-scroll-reveal-reduced-fade 160ms cubic-bezier(0.23, 1, 0.32, 1) both !important;
}
.motion-demo.motion-demo--scroll-reveal *, .motion-demo.motion-demo--scroll-reveal *::before, .motion-demo.motion-demo--scroll-reveal *::after {
animation: none !important;
animation-delay: 0ms !important;
animation-iteration-count: 1 !important;
transition-property: opacity, color, background-color, border-color !important;
transition-duration: 160ms !important;
transition-delay: 0ms !important;
scroll-behavior: auto !important;
}
.motion-demo.motion-demo--scroll-reveal .motion-button,
.motion-demo.motion-demo--scroll-reveal [data-reorder-item],
.motion-demo.motion-demo--scroll-reveal [data-swipe-target],
.motion-demo.motion-demo--scroll-reveal [data-spring-target] {
transform: none !important;
}
.motion-demo.motion-demo--scroll-reveal .motion-path { stroke-dashoffset: 0 !important; }
.motion-demo.motion-demo--scroll-reveal .motion-word--from { opacity: 0 !important; visibility: hidden; }
.motion-demo.motion-demo--scroll-reveal .motion-word:not(.motion-word--from) { opacity: 1 !important; filter: none !important; transform: none !important; }
}深入了解
术语与辨析
scroll-reveal滚动揭示
Scroll reveal英文定义
Viewport entry triggers a one-time opacity or position transition for newly visible content.
中文翻译
元素进入视口时淡入或滑动到位。
实现前检查
- 目的
- 在内容首次进入视口时提示新的阅读区块，并保持页面滚动连续。
- 频率
- 每个内容块最多触发一次；长页面仅选择具有结构意义的节点。
- 触发
- 由 IntersectionObserver 达到阈值触发，页面加载时已可见内容立即呈现。
- 进入 / 离开
- 进入采用短位移和淡入；滚出视口后保持稳定，避免反复隐藏。
- 可打断性
- 快速滚动时直接完成当前揭示，避免队列堆积。
- 手势与键盘
- 滚动本身保持原生；揭示动画不能劫持滚轮、触摸或键盘滚动。
- 减弱动效策略
- 内容进入视口时立即显示，或只保留一次极短淡入。
可访问性
减弱动效
内容进入视口时立即显示，或只保留一次极短淡入。
参数参考
| 参数 | 范围 / 选项 | 默认值 | 作用 |
|---|---|---|---|
duration | 80ms–1200ms | 260ms | 控制一次动效完成所需的时间。 |
threshold | 0%–80% | 20% | 调节触发阈值。 |
distance | 0px–120px | 28px | 控制元素移动的空间距离。 |
ease | 柔和 / 清脆 / 平稳 / 匀速 | 柔和 | 控制速度随时间变化的方式。 |
交付前检查
- 禁用 JavaScript 时内容仍应可见。
- 避免首屏关键内容等待 observer 回调。