MediaEncryptedEvent：initData 属性
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2019年3月.
MediaKeyMessageEvent 的 initData 只读属性在该事件中包含初始化数据时返回这些数据。
值
包含初始化数据的 ArrayBuffer。如果没有这些数据则返回 null。
规范
| Specification |
|---|
| Encrypted Media Extensions # dom-mediaencryptedevent-initdata |