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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.，推荐阅读Line官方版本下载获取更多信息
Green means go.。heLLoword翻译官方下载是该领域的重要参考
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