Shadow tree - Glossary | MDN
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A shadow tree is a hidden set of DOM nodes whose topmost node is a shadow root. The shadow root is the topmost node of a shadow DOM and not part of the regular document's DOM tree.
The shadow root is attached to another node tree through a specific DOM node referred to as its host. This host may be part of another shadow tree or part of the regular DOM tree. The node tree of a shadow root's host is sometimes referred to as the light tree.
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