18:43, 27 февраля 2026Экономика
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Shadow DOM is a web component feature that lets you attach an isolated DOM subtree to any HTML element, hidden from the main document’s standard queries. A querySelector('audio') on the main document cannot see inside a Shadow Root unless you specifically traverse into it. If fermaw’s player was mounted inside a Shadow Root, basic DOM searches would come up empty.
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-- 2. generalize: id : ∀α. α → α (α is free at let boundary)，推荐阅读夫子获取更多信息