Hello,

I intend to ship MediaCapabilitiesKeySystemConfiguration 
<https://w3c.github.io/media-capabilities/#mediacapabilitieskeysystemconfiguration>
 
within MediaDecodingConfiguration 
<https://w3c.github.io/media-capabilities/#dictdef-mediadecodingconfiguration> 
for the Media Capabilities API on *Firefox 129*.

*Summary:* 
Web authors can use MediaCapabilitiesKeySystemConfiguration 
<https://w3c.github.io/media-capabilities/#mediacapabilitieskeysystemconfiguration>
 
within MediaDecodingConfiguration 
<https://w3c.github.io/media-capabilities/#dictdef-mediadecodingconfiguration> 
to query for content types associated with a specific key system 
configuration. 

By passing the configuration through the decodingInfo() 
<https://w3c.github.io/media-capabilities/#dom-mediacapabilities-decodinginfo> 
method, the result will be a  MediaCapabilitiesDecodingInfo 
<https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitiesdecodinginfo>,
 
which can indicate whether the given configuration is supported. 

*Bug for Feature Implementation: *
https://bugzilla.mozilla.org/show_bug.cgi?id=1898344

*Standard: *
https://w3c.github.io/media-capabilities/#mediacapabilitieskeysystemconfiguration

*Platform Coverage:* Available on all platforms.


*Other Browsers: *

Blink has shipped this feature 
<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>
 
on M80. 

<https://caniuse.com/?search=getStatusForPolicy>
WebKit hasn't implemented this feature 
<https://searchfox.org/wubkat/source/Source/WebCore/Modules/mediacapabilities/MediaDecodingConfiguration.idl#29-31>
 
yet.

*Web-platform-tests:* 
https://wpt.fyi/results/media-capabilities?label=master&label=experimental&aligned&q=decodinginfo

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