Hello,

I intend to turn *ON *the preference
*media.eme.encrypted-media-encryption-scheme.enable* by default for all
platforms in *Firefox 128*, which will allows web developers to use
encryptionScheme
in MediaKeySystemMediaCapability
<https://w3c.github.io/encrypted-media/#dom-mediakeysystemmediacapability-encryptionscheme>
for EME API.

*Summary:* The *encryptionScheme *is an optional attribute in
*MediaKeySystemMediaCapability*, which is used to indicate the encryption
scheme associated with the content type. Web developers can use that
attribute to explicitly indicate what encryption scheme the user agent
should support. We've implemented this feature for a long time, and it's
time to turn it on by default.

*Bug for Feature Implementation :
*https://bugzilla.mozilla.org/show_bug.cgi?id=1536102


*Bug to turn on by default: *
https://bugzilla.mozilla.org/show_bug.cgi?id=1899182

*Standard: *
https://w3c.github.io/encrypted-media/#dom-mediakeysystemmediacapability-encryptionscheme

*Platform Coverage:* Available on all platforms.

*Preference*: media.eme.encrypted-media-encryption-scheme.enable

*Other Browsers: *Other browsers have shipped this feature.

Blink:
https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/encryptedmedia/media_key_system_media_capability.idl;l=10

Webkit :
https://searchfox.org/wubkat/source/Source/WebCore/Modules/encryptedmedia/MediaKeySystemMediaCapability.idl#35

Web-platform-tests:
https://wpt.fyi/results/encrypted-media/clearkey-check-encryption-scheme.https.html
<https://wpt.fyi/results/encrypted-media/clearkey-check-encryption-scheme.https.html>

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