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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The European Service Module provides power and propulsion and life support systems
Mr Fingleton added: "Motorways wouldn't be very useful if we all drove at five miles (8km) an hour, but that's sort of what we're doing in nuclear safety."