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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
property represents the shadow root hosted by the element, regardless if its
Element.attachShadow() to add a shadow
root to an existing element.
var shadowroot = element.openOrCloseShadowRoot;
This property is not part of any specification.
BCD tables only load in the browser