Contact emails [email protected], [email protected]
Explainer https://github.com/WICG/PEPC/blob/main/usermedia_element.md Specification https://github.com/w3c/mediacapture-extensions/pull/168 Summary Usermedia Capability Element, is a declarative, user-activated control for accessing the starting and interacting with media streams. This addresses the long-standing problem of permission prompts being triggered directly from JavaScript without a strong signal of user intent. By embedding a browser-controlled element in the page, the user's click provides a clear, intentional signal. This enables a much better prompt UX and, crucially, provides a simple recovery path for users who have previously denied the permission. Note: This feature was previously developed and tested in an Origin Trial as the more generic <permission> element. Based on feedback from developers and other browser vendors, it has evolved into capability-specific elements to provide a more tailored and powerful developer experience. Blink component Public Trackers > Chromium Public Trackers > Chromium > Internals > Permissions > PermissionElement Web Feature ID permissions TAG review https://github.com/w3ctag/design-reviews/issues/1218 TAG review status Issues addressed Origin Trial Name UserMediaElement Goals for experimentation This Origin Trial serves two primary purposes: ensuring continuity for existing partners who have successfully integrated this pattern, and providing a platform to validate and iterate on the new, capability-specific <usermedia> element. While our previous Origin Trial for <permission> provided strong evidence for the core user-initiated model, feedback from developers and browser vendors prompted us to evolve the design. This new trial is essential for gathering insights on a refined, data-centric API shape to help us reach cross-browser consensus. To ensure a seamless transition and prevent disruption for our valued OT partners, this trial will initially launch with an API shape that is functionally equivalent to the previous <permission> trial, simply using the new <usermedia> element name. This provides a stable foundation from which we will iterate based on further discussion. Our goal is to evolve this element towards our proposed data-centric design (https://github.com/WICG/PEPC/blob/main/usermedia_element.md). However, we recognize that this more advanced API has raised compatibility and complexity concerns with developers (https://github.com/WICG/PEPC/issues/62). Therefore, a primary objective of this trial is to work closely with the community to address these concerns and refine the final API. TPAC WebRTC minutes https://www.w3.org/2025/11/11-webrtc-minutes.html#551 Chromium Trial Name UserMediaElement Origin Trial documentation link https://github.com/WICG/PEPC/blob/main/usermedia_element.md WebFeature UseCounter name kHTMLPermissionElement Risks Interoperability and Compatibility There is a risk that this feature fails to be adopted by other browsers. This can be mitigated by backwards designing a reasonable fallback mechanism so that the element can degrade gracefully if the it's in an unsupported environment. Gecko: Under consideration (https://github.com/mozilla/standards-positions/issues/1392) WebKit: No signal Web developers: Positive https://github.com/WICG/PEPC/issues/2#issuecomment-2393820279 https://github.com/WICG/PEPC/issues/2#issuecomment-2393861768 https://github.com/WICG/PEPC/issues/2#issuecomment-2393911331 https://github.com/WICG/PEPC/issues/2#issuecomment-2619657041 https://github.com/WICG/PEPC/issues/62#issuecomment-3482975001 https://github.com/WICG/PEPC/issues/62#issuecomment-3482981942 https://github.com/WICG/PEPC/issues/62#issuecomment-3498355775 https://github.com/WICG/PEPC/issues/62#issuecomment-3513734884 Other signals: Ergonomics No foreseen ergonomics risks. Activation A polyfill can help developers use this feature without risking broken functionality on non-supporting browsers. Security https://github.com/WICG/PEPC/blob/main/explainer.md#Security 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? Feature is not shipping on WebView due to it requiring permission manager embedder support. Reason this experiment is being extended We are looking to collect more feedback on the updated <usermedia> element API design. Based on feedback from https://github.com/w3c/mediacapture-extensions/pull/168/, we anticipate some changes to the API. As a result, we have decided not to launch this feature in M149. To ensure our partners currently using the Origin Trial do not experience unexpected service disruptions, we will need to extend the OT. Ongoing technical constraints No information provided Debuggability The element raises issues to the devtools issues panel which help developers debug issues with their usage of the element. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? No The element is not supported on Android WebView as it requires permission manager support to function and the WebView permission manager defers most permission decisions to the embedder by design. Is this feature fully tested by web-platform-tests? Yes https://wpt.fyi/results/html/semantics/permission-element/usermedia DevTrial instructions https://github.com/WICG/PEPC/blob/main/HOWTO.md#enabling-usermedia Flag name on about://flags No information provided Finch feature name UserMediaElement Requires code in //chrome? True Tracking bug https://crbug.com/443013457 Availability expectation Feature is available only in Chromium browsers. We are not aware of other browsers adoption. Adoption expectation Feature is used by specific partner(s) to provide functionality within 12 months of launch in Chrome. Partners who are tested the feature in OT are expected to continue usage. Adoption plan We are planning to publish on developer.chrome.com and do further partner outreach Non-OSS dependencies Does the feature depend on any code or APIs outside the Chromium open source repository and its open-source dependencies to function? No Estimated milestones Shipping on desktop 150 Origin trial desktop first 144 Origin trial desktop last 148 Origin trial extension 1 end milestone 152 DevTrial on desktop 144 Shipping on Android 150 Origin trial Android first 144 Origin trial Android last 148 DevTrial on Android 144 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (eg links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (eg, changing to naming or structure of the API in a non-backward-compatible way). This is an MVP launch. The MVP feature is fully functional and used by developers right now. We are working closely with the WebRTC on post-MVP features, the open topics will based on the foundation of the MVP, that we agreed upon with the WebRTC. Some of the open topics are for example: In the future, we might want to add a parameter to the getUserMedia algorithm so that the algorithm can determine whether the getUserMedia is called from the <usermedia> element or getUserMedia API. Potential to add additional attributes for <usermedia> interface. We're putting finishing touches on the spec now, work-in-progress PR is here, but once that lands we want to ship for M149 so wanted to start the discussion now. Link to entry on the Chrome Platform Status https://chromestatus.com/feature/4926233538330624?gate=5103061887483904 Links to previous Intent discussions Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/692719de.050a0220.17ec37.00c3.GAE%40google.com Intent to Experiment: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6942ed09.050a0220.1050d6.0961.GAE%40google.com Intent to Ship: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69dfa184.050a0220.c8e20.03e8.GAE%40google.com This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69f8fb56.050a0220.32fa05.04df.GAE%40google.com.
