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.
Number (1): Everything in this space must add up to 1. The answer is 3-1, placed vertically.
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I spent weeks with Alexa on the Echo Show 11, and it was awesome (until I started fact-checking)，详情可参考体育直播
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