Function isInTree

src/ink/focus.ts:153–160

(node: DOMElement, root: DOMElement)

}

function isInTree(node: DOMElement, root: DOMElement): boolean {
  let current: DOMElement | undefined = node
  while (current) {
    if (current === root) return true
    current = current.parentNode
  }
  return false
}

/**
 * Walk up to root and return it. The root is the node that holds