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"generateRequest Generates a request based on the initData. Parameter Type Nullable Optional Description initDataType DOMString ✘ ✘ Initialization Data initData BufferSource ✘ ✘ The Initialization Data Type of the initData." The parameter descriptions in the above section seem to describe the wrong parameter.
Thanks for the report. I'll fix it.
Fixed in https://github.com/w3c/encrypted-media/commit/3d28b6aa3cbe2278213a45dd146bf024d76b7d24