Currently Firefox hasn't implemented `MediaCapabilitiesKeySystemConfiguration`. Chromium has supported [that](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/media_capabilities/media_decoding_configuration.idl;l=15-18?q=dictionary%20MediaDecodingConfiguration&ss=chromium%2Fchromium%2Fsrc) but WebKit [hasn't supported](https://searchfox.org/wubkat/source/Source/WebCore/Modules/mediacapabilities/MediaDecodingConfiguration.idl#29-31) that yet.
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Currently Firefox hasn't implemented [MediaCapabilitiesKeySystemConfiguration](https://www.w3.org/TR/media-capabilities/#mediacapabilitieskeysystemconfiguration). Chromium has supported [that](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/media_capabilities/media_decoding_configuration.idl;l=15-18?q=dictionary%20MediaDecodingConfiguration&ss=chromium%2Fchromium%2Fsrc) but WebKit [hasn't supported](https://searchfox.org/wubkat/source/Source/WebCore/Modules/mediacapabilities/MediaDecodingConfiguration.idl#29-31) that yet.
Currently Firefox hasn't implemented [MediaCapabilitiesKeySystemConfiguration](https://w3c.github.io/media-capabilities/#mediacapabilitieskeysystemconfiguration). Chromium has supported [that](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/media_capabilities/media_decoding_configuration.idl;l=15-18?q=dictionary%20MediaDecodingConfiguration&ss=chromium%2Fchromium%2Fsrc) but WebKit [hasn't supported](https://searchfox.org/wubkat/source/Source/WebCore/Modules/mediacapabilities/MediaDecodingConfiguration.idl#29-31) that yet. This bug will add the implementation for `MediaCapabilitiesKeySystemConfiguration` and then allows website to request a [MediaCapabilitiesDecodingInfo](https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitiesdecodinginfo) via [decodingInfo()](https://w3c.github.io/media-capabilities/#dom-mediacapabilities-decodinginfo) method.
Currently Firefox hasn't implemented [MediaCapabilitiesKeySystemConfiguration](https://w3c.github.io/media-capabilities/#mediacapabilitieskeysystemconfiguration) in [MediaDecodingConfiguration](https://w3c.github.io/media-capabilities/#dictdef-mediadecodingconfiguration). Chromium has supported [that](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/media_capabilities/media_decoding_configuration.idl;l=15-18?q=dictionary%20MediaDecodingConfiguration&ss=chromium%2Fchromium%2Fsrc) but WebKit [hasn't supported](https://searchfox.org/wubkat/source/Source/WebCore/Modules/mediacapabilities/MediaDecodingConfiguration.idl#29-31) that yet. This bug will add the implementation for `MediaCapabilitiesKeySystemConfiguration` and then allows website to request a [MediaCapabilitiesDecodingInfo](https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitiesdecodinginfo) via [decodingInfo()](https://w3c.github.io/media-capabilities/#dom-mediacapabilities-decodinginfo) method.