*> Specification*
*> https://github.com/whatwg/html/pull/11620 
<https://github.com/whatwg/html/pull/11620>*

Is anything blocking this spec PR from landing?

> *Interoperability and Compatibility*
*No information provided*

Since this would change a shipped API, can you comment on the compatibility 
risk? Is there a possibility that sites already using the feature could be 
affected?

-- Dan

On Friday, September 18, 2026 at 3:04:11 AM UTC-7 [email protected] wrote:

> *Contact emails*
> [email protected]
>
> *Specification*
> https://github.com/whatwg/html/pull/11620 
>
> *Summary*
> When fetching rel=compression-dictionary links:
> - Use "compression-dictionary" as request destination.
> - Properly set request's mode, credentials, referrer and referrerpolicy.
> - Take into account crossorigin and referrer attributes from <link 
> rel="compression-dictionary">. 
>
> *Blink component*
> Blink>Network 
> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ENetwork%22>
>
> *Web Feature ID*
> compression-dictionary-transport 
> <https://webstatus.dev/features/compression-dictionary-transport> 
>
> *Motivation*
> Compression Dictionary Transport was shipped in Chromium 130. Recently 
> Mozilla and Igalia worked on some implementation in Firefox and WebKit, 
> quite a bunch of tests have been added and the spec has been updated. This 
> intent to ship is to catch up with the latest changes.
>
> *Initial public proposal*
> *No information provided*
>
> *TAG review*
> *No information provided* 
>
> *TAG review status*
> Not applicable
>
> *Goals for experimentation*
> None 
>
> *Risks*
>
>
> *Interoperability and Compatibility*
> *No information provided* 
>
> *Gecko*: Mozilla is implementing Compression dictionary transport and 
> will have to align with the changes to make the test pass. 
>
> *WebKit*: Igalia is currently upstreaming their implementation and we are 
> aligned with these changes.
>
> *Web developers*: No signals
>
> *Other signals*:
>
> *WebView application risks*
>
> Does this intent deprecate or change behavior of existing APIs, such that 
> it has potentially high risk for Android WebView-based applications? 
> *No information provided* 
>
>
> *Debuggability*
> *No information provided* 
>
> *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 
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
> Yes, see
>
>
> https://wpt.fyi/results/fetch/compression-dictionary/fetch-destination.tentative.https.html
>
> https://wpt.fyi/results/fetch/compression-dictionary/dictionary-fetch-with-link-element-crossorigin.tentative.https.html
>
> https://wpt.fyi/results/fetch/compression-dictionary/dictionary-fetch-with-link-referrer-and-referrerpolicy.tentative.https.html
>
> *Flag name on about://flags*
> *No information provided* 
>
> *Finch feature name*
> CDTNewDestination, CDTNewCrossOriginHandling, 
> CDTNewReferrerAndReferrerPolicyHandling
>
> *Rollout plan*
> Will ship enabled for all users
>
> *Requires code in //chrome?*
> False
>
> *Tracking bug*
> https://issues.chromium.org/issues/40255884
>
> *Estimated milestones*
> Shipping on desktop 156 
>
> *Anticipated spec changes*
> The spec PRs are still being reviewed and firefox/webkit implementation is 
> still in progress, so more changes may happen in the future. However, the 
> three changes here seems uncontroversial they basically align 
> rel=compression-dictionary links with what is done for other kind of links.
>
> *Link to entry on the Chrome Platform Status*
> https://chromestatus.com/feature/4895435813683200?gate=6090572807929856
>
> This intent message was generated by Chrome Platform Status 
> <https://chromestatus.com>. 
>
>
>

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