View Transitions 与 @starting-style 首次渲染过渡与闪烁治理

View Transitions 与 @starting-style 首次渲染过渡与闪烁治理概述首次渲染阶段易出现 FOUC 与闪烁。通过 `@starting-style` 与 View Transitions 的协同，可实现更平滑与稳定的初始过渡。关键参数/概念`@starting-style` 定义元素初始样式以平滑过渡至最终状态。`view-transition-name` 标记共享元素以在路由间一致过渡。无障碍：在减少动态效果偏好下禁用动画路径。实践/示例.title { view-transition-name: page-title } @starting-style { .title { opacity: 0; transform: translateY(8px) } } ::view-transition-old(page-title), ::view-transition-new(page-title) { animation: fade 160ms ease } @keyframes fade { from { opacity: 0; transform: translateY(8px) } to { opacity: 1; transform: translateY(0) } } @media (prefers-reduced-motion: reduce) { ::view-transition-old(page-title), ::view-transition-new(page-title) { animation: none } } function withTransition(run) { const reduce = matchMedia('(prefers-reduced-motion: reduce)').matches if (reduce || !document.startViewTransition) { run(); return } document.startViewTransition(() => run()) } 验证方法截图比对：首次加载与导航场景检查闪烁与视觉一致性。指标：采集 LCP 与首次过渡耗时并比较不同方案。无障碍：偏好降级路径仍信息完备与可达。注意事项初始样式与最终样式需协调，避免大幅尺寸变化。控制动画时长与缓动，减少与交互冲突。保持语义结构优先，不以动画替代内容表达。参考资料MDN: ViewTransition 与 `startViewTransition()`（2025-11 更新）https://developer.mozilla.org/en-US/docs/Web/API/Document/startViewTransitionhttps://developer.mozilla.org/en-US/docs/Web/API/ViewTransition