"required" | "optional" | "not-allowed"
required:
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For more information, see https://www.w3.org/TR/encrypted-media/#dom-mediakeysrequirement.
"required" | "optional" | "not-allowed"
required:
When used in a call to requestMediaKeySystemAccess(),
the returned object must support this feature.
When returned by a MediaKeySystemAccess object,
CDM instances created by the object may use this feature.
When used in a call to requestMediaKeySystemAccess(),
the returned object may support and use this feature.
When returned by a MediaKeySystemAccess object,
this value cannot and must not be present in such an object.
When used in a call to requestMediaKeySystemAccess(),
the returned object must function without using this feature and must not use it at any time.
When returned by a MediaKeySystemAccess object
CDM instances created by the object must not use this feature.
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Supported devices
