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，这一点在Line官方版本下载中也有详细论述
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.
It was a huge step forward for Bezos and his company that has spent years getting to the point of sending a rocket into orbit.