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Using shadow DOM — MDN Web Docs
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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.
想让网页显示立体的 "Hello World"？你需要加载字体文件，然后 TextGeometry 会帮你把文字变成 3D 模型，甚至还能加倒角让文字更有质感。
* 可根据需要替换上面的gap循环