LGTM3

On Monday, July 27, 2026 at 11:46:02 AM UTC-7 [email protected] wrote:

> LGTM2
>
> On Monday, July 27, 2026 at 9:52:37 AM UTC-7 Mike Taylor wrote:
>
>> (Also, can you please request the privacy, security, enterprise, etc bits 
>> in your chromestatus entry?)
>>
> On 7/27/26 12:51 p.m., Mike Taylor wrote:
>>
> Thanks for doing the work to catch us up to other engines - LGTM1
>> On 7/24/26 5:04 p.m., Sangbaek Park wrote:
>>
>> Contact emails [email protected]
>>
>> Specification 
>> https://w3c.github.io/media-capabilities/#dom-keysystemtrackconfiguration-encryptionscheme
>>
>> Summary Adds the encryptionScheme attribute to the 
>> KeySystemTrackConfiguration dictionary used in 
>> navigator.mediaCapabilities.decodingInfo(). This allows web applications 
>> to query whether a specific encryption scheme (such as 'cenc' or 'cbcs') is 
>> supported.
>>
>> This feature is already approved by the W3C spec and the underlying 
>> backend implementation in Chromium already exists. This launch is purely to 
>> plumb the encryptionScheme property from the Blink IDL layer to the 
>> existing backend.
>>
>> Blink component Blink>Media
>>
>> Search tags media-capabilities, decodingInfo, encryptionScheme, eme, 
>> drm, cenc, cbcs
>>
>> TAG review None. This is a trivial IDL plumbing update for a standard 
>> that is already shipped by other vendors.
>>
>> TAG review status Not applicable
>>
>> Risks Interoperability and Compatibility None. We are simply exposing 
>> the encryptionScheme property to match the W3C spec. Edge and Firefox 
>> have already implemented this and pass the relevant tests.
>>
>> *Gecko:* Shipped *WebKit:* Not Supported *Web developers:* Positive
>>
>> Debuggability N/A
>>
>> Will this feature be supported on all six Blink platforms (Windows, Mac, 
>> Linux, ChromeOS, Android, and Android WebView)? Yes
>>
>> Is this feature fully tested by web-platform-tests? Yes. The 
>> web-platform-tests were recently updated to robustly verify this plumbing.
>>
>> As shown on the main WPT dashboard, Chrome Stable is currently lagging 
>> behind Edge and Firefox: 
>> https://wpt.fyi/results/media-capabilities/decodingInfoEncryptedMedia.https.html?label=master&product=chrome%5Bstable%5D&product=edge%5Bexperimental%5D&product=firefox%5Bexperimental%5D&product=safari%5Bexperimental%5D&aligned
>>
>> However, the plumbing is already verified to work in Chrome Canary (where 
>> the feature flag is enabled), as shown here: 
>> https://wpt.fyi/results/media-capabilities/decodingInfoEncryptedMedia.https.html?label=experimental&label=master&aligned
>>
>> This launch simply flips the flag to stable to catch up.
>>
>> Requires code in //chrome? False
>>
>> Tracking bug https://crbug.com/498284510
>>
>> Link to entry on the Chrome Platform Status 
>> https://chromestatus.com/feature/4644898109259776
>>
>>

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