Amazon Developer

Console

as

Settings
Sign out
Notifications
Alexa
Amazon Appstore
Ring
AWS
Documentation
Support
Contact Us
My Cases

Console

as

Get Started
Design and Develop
Publish
Reference
Support
Skip to main content
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. optional: 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. not-allowed: 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. For more information, see https://www.w3.org/TR/encrypted-media/#dom-mediakeysrequirement.
Last modified on July 22, 2026