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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator/pointerBeforeReferenceNode below:

NodeIterator: pointerBeforeReferenceNode property - Web APIs

Baseline Widely available

The NodeIterator.pointerBeforeReferenceNode read-only property returns a boolean flag that indicates whether the NodeFilter is anchored before (if this value is true) or after (if this value is false) the anchor node indicated by the NodeIterator.referenceNode property.

A boolean.

const nodeIterator = document.createNodeIterator(
  document.body,
  NodeFilter.SHOW_ELEMENT,
  {
    acceptNode(node) {
      return NodeFilter.FILTER_ACCEPT;
    },
  },
);
flag = nodeIterator.pointerBeforeReferenceNode;

• The interface it belongs to: NodeIterator

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