A Worker could not be started immediately because other documents in the same origin are already using the maximum number of workers. The Worker is now queued and will be started after some of the other workers have completed.
一个 Worker 不能立即开始，因为同源的其他文档已经使用最大数量的 Worker。该 Worker 已进入队列，将在其他一些 Worker 完成后开始。