The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
既然是硬件层面的可控反馈，就意味着这个功能还有软件加持的想象空间——由于在单颗像素的层面进行控光，隐私屏幕可以实现「局部遮蔽」。比如在拥挤的地铁上看手机，屏幕上只有通知弹窗或者来电信息的一小块区域会瞬间进入防窥模式。整体反黑，局部防窥，想开就开，关掉时丝毫不影响这块顶级屏幕原本的通透感。
。业内人士推荐搜狗输入法2026作为进阶阅读
Graceful Fallback for Extreme Customization:
Employees did not have to take a cut in salary, and nor did they have to work longer hours on the four days. Instead, their hours remain at 32-per-week, or eight-per-day.
Earlier in the night, Afghanistan's Taliban government said it had launched a major ground operation against Pakistani military positions near the border, claiming to have captured several posts, and also claiming to have captured and killed Pakistani soldiers.