Function contains

packages/core/src/document/node/node.ts:787–802

(node1: Node, node2: Node)

 * check if node1 contains node2
 */
export const contains = (node1: Node, node2: Node): boolean => {
  if (node1 === node2) {
    return true
  }

  if (!node1.isParental || !node2.parent) {
    return false
  }

  const p = getZLevelTop(node2, node1.zLevel)
  if (!p) {
    return false
  }

  return node1 === p
}

// 16 node1 contains node2
// 8  node1 contained_by node2