LGTM1 assuming they are shipping.
/Daniel
On 2026-01-12 23:20, 'Dan Clark' via blink-dev wrote:
Thanks! I see in the ChromeStatus entry that "Supported on all
platforms" is now "Yes", but the Firefox and Safari positions still
show Positive. Could you confirm these should be Shipped/Shipping or
do those browsers not yet fully support the behavior we intend to ship?
Thanks,
Dan
On Monday, January 12, 2026 at 1:27:58 PM UTC-8 [email protected] wrote:
@dan - updated, sorry
[email protected] schrieb am Montag, 12. Januar 2026 um
19:25:19 UTC+1:
/> Gecko: Positive/
/> WebKit: Positive/
Should these say Shipped/Shipping? Firefox and Safari pass
the WPT:
https://wpt.fyi/results/fetch/data-urls?label=master&label=stable&aligned&q=fetch%2Fdata-urls%2Fprocessing.any.html
<https://wpt.fyi/results/fetch/data-urls?label=master&label=stable&aligned&q=fetch%2Fdata-urls%2Fprocessing.any.html>
*/> Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?/*
/> No/
Should this be Yes? In a quick scan of the CL I didn't see
anything scoping this to a particular platform(s).
-- Dan
On Monday, January 12, 2026 at 5:27:41 AM UTC-8
[email protected] wrote:
*Contact emails*
[email protected]
*Explainer*
https://chromium-review.googlesource.com/c/chromium/src/+/7135039
*Specification*
https://fetch.spec.whatwg.org/#data-url-processor
*Summary*
Preserve MIME type parameters (e.g., charset, boundary) in
data URL Content-Type headers per the Fetch Standard. CL:
https://chromium-review.googlesource.com/c/chromium/src/+/7135039
*Blink component*
Blink>Network>FetchAPI
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ENetwork%3EFetchAPI%22>
*Web Feature ID*
fetch <https://webstatus.dev/features/fetch>
*Motivation*
Currently, Chromium only extracts the charset parameter
from data URLs and discards other MIME type parameters.
Per the Fetch Standard, data URL MIME type parameters
should be preserved in the Content-Type header. For
example: - data:text/plain;a=b,X should return
Content-Type: text/plain;a=b - data:;charset=" x",X should
return Content-Type: text/plain;charset=" x" This change
brings Chromium into compliance with the Fetch Standard
and improves web compatibility with other browsers. Spec:
https://fetch.spec.whatwg.org/#data-url-processor
*Initial public proposal*
https://chromium-review.googlesource.com/c/chromium/src/+/7135039
*TAG review*
/No information provided/
*TAG review status*
Not applicable
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/: Positive
/WebKit/: Positive
/Web developers/: Positive
/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)?*
No
*Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
external/wpt/fetch/data-urls/processing.any.html
*Flag name on about://flags*
/No information provided/
*Finch feature name*
DataUrlMimeTypeParameterPreservation
*Rollout plan*
(RARE) Experiment users ramp up over time
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/40487194
*Estimated milestones*
Shipping on desktop 146
Shipping on Android 146
*Anticipated spec changes*
Open questions about a feature may be a source of future
web compat or interop issues. Please list open issues
(e.g. links to known github issues in the project for the
feature specification) whose resolution may introduce web
compat/interop risk (e.g., changing to naming or structure
of the API in a non-backward-compatible way).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/4874471565557760?gate=6595063650058240
This intent message was generated by Chrome Platform
Status <https://chromestatus.com/>.
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