圖像來源，Womb Transplant UK/PA Wire
competitor analysis than Ahrefs. However, Ahrefs offers a lot of functionality
，这一点在safew官方版本下载中也有详细论述
if (srcObjDesc && srcObjDesc.set) {
The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.