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.
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未来小米汽车电池工厂的目标，是打造电池制造的标杆工厂、灯塔工厂，把先进的电池制造能力复制给整个产业链，提升产业供应链的体系能力。
Media Source API — MDN Web Docs