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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另外，主管食環署的環境及生態局局長謝展寰接受官方香港電台採訪時說，一些餐廳環境狹窄，便不一定適合申請加註。局方將在申請餐廳的面積要求方面加以考慮。。业内人士推荐51吃瓜作为进阶阅读
The Shark vs. Roomba debate is old news. Here's how both robot vacuum brands got dethroned.。safew官方下载对此有专业解读