Experimental

For a given set of browsers what APIs are still considred experimental, and how long have they been experimental?

Example Comparisons
Browsers
Features

Summary

Experimental APIs

Below is a list of features that are marked as "Experimental" in Chrome and Firefox

Raw Data

Quick Links:

HTTP Data

API First Browser Date Last Browser Date Days in experimentation Notes
http.headers.Accept-CH.Device-Memory Chrome9/5/2017 3253
http.headers.Accept-CH.Sec-CH-UA Chrome3/2/2021 1979
http.headers.Accept-CH.Sec-CH-UA-Arch Chrome3/2/2021 1979
http.headers.Accept-CH.Sec-CH-UA-Full-Version Chrome3/2/2021 1979
http.headers.Accept-CH.Sec-CH-UA-Mobile Chrome3/2/2021 1979
http.headers.Accept-CH.Sec-CH-UA-Model Chrome3/2/2021 1979
http.headers.Accept-CH.Sec-CH-UA-Platform Chrome3/2/2021 1979
http.headers.Accept-CH.Sec-CH-UA-Platform-Version Chrome3/2/2021 1979
http.headers.Attribution-Reporting-Eligible 📋Chrome9/12/2023 1055
http.headers.Attribution-Reporting-Register-Source 📋Chrome9/12/2023 1055
http.headers.Attribution-Reporting-Register-Trigger 📋Chrome9/12/2023 1055
http.headers.Attribution-Reporting-Support 📋Chrome9/12/2023 1055
http.headers.Clear-Site-Data.clientHints 📋Chrome9/12/2023 1055
http.headers.Content-Security-Policy.fenced-frame-src 📋Chrome7/18/2023 1111
http.headers.Content-Security-Policy.require-trusted-types-for 📋Chrome5/19/2020 2266
http.headers.Content-Security-Policy.script-src.inline-speculation-rules 📋Chrome2/7/2023 1272
http.headers.Content-Security-Policy.trusted-types 📋Chrome5/19/2020 2266
http.headers.Critical-CH 📋Chrome5/25/2021 1895
http.headers.Cross-Origin-Opener-Policy.noopener-allow-popups 📋Chrome11/12/2024 628
http.headers.Downlink 📋Chrome5/29/2018 2987
Chrome: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.Chrome Android: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.Edge: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.Quest Browser: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.Opera: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.Opera Android: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.Samsung Internet: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.WebView Android: The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
http.headers.ECT 📋Chrome5/29/2018 2987
http.headers.Early-Data 📋Firefox1/23/2018 3113
http.headers.Link.blocking 📋Chrome9/2/2022 1430
http.headers.Link.expect 📋Chrome4/16/2024 838
http.headers.NEL 📋Chrome12/4/2018 2798
http.headers.No-Vary-Search 📋Chrome7/23/2024 740
Chrome: Supported for navigation prefetch cache only.Chrome Android: Supported for navigation prefetch cache only.Edge: Supported for navigation prefetch cache only.Opera: Supported for navigation prefetch cache only.Opera Android: Supported for navigation prefetch cache only.Samsung Internet: Supported for navigation prefetch cache only.WebView Android: Supported for navigation prefetch cache only.
http.headers.Observe-Browsing-Topics Chrome7/18/2023 1111
http.headers.Origin-Agent-Cluster 📋Chrome4/13/2021 1937
http.headers.Permissions-Policy 📋Chrome1/19/2021 2021
http.headers.Permissions-Policy.accelerometer 📋Chrome4/17/2018 3029
http.headers.Permissions-Policy.ambient-light-sensor 📋Chrome4/17/2018 3029
http.headers.Permissions-Policy.attribution-reporting 📋Chrome9/12/2023 1055
http.headers.Permissions-Policy.autoplay 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.bluetooth 📋Chrome8/2/2022 1461
http.headers.Permissions-Policy.browsing-topics Chrome7/18/2023 1111
http.headers.Permissions-Policy.camera 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.compute-pressure 📋Chrome5/14/2024 810
http.headers.Permissions-Policy.cross-origin-isolated 📋Chrome11/17/2020 2084
http.headers.Permissions-Policy.display-capture 📋Chrome9/21/2021 1776
http.headers.Permissions-Policy.document-domain 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.encrypted-media 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.fullscreen 📋Chrome10/17/2017 3211
http.headers.Permissions-Policy.geolocation 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.gyroscope 📋Chrome4/17/2018 3029
http.headers.Permissions-Policy.hid 📋Chrome3/2/2021 1979
http.headers.Permissions-Policy.identity-credentials-get 📋Chrome2/7/2023 1272
http.headers.Permissions-Policy.idle-detection 📋Chrome9/21/2021 1776
http.headers.Permissions-Policy.local-fonts 📋Chrome6/21/2022 1503
http.headers.Permissions-Policy.magnetometer 📋Chrome4/17/2018 3029
http.headers.Permissions-Policy.microphone 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.midi 📋Chrome1/23/2018 3113
http.headers.Permissions-Policy.otp-credentials 📋Chrome8/31/2021 1797
http.headers.Permissions-Policy.payment 📋Chrome7/25/2017 3295
http.headers.Permissions-Policy.picture-in-picture 📋Chrome12/4/2018 2798
http.headers.Permissions-Policy.publickey-credentials-create 📋Chrome7/27/2020 2197
http.headers.Permissions-Policy.publickey-credentials-get 📋Chrome7/27/2020 2197
http.headers.Permissions-Policy.screen-wake-lock 📋Chrome7/27/2020 2197
http.headers.Permissions-Policy.serial 📋Chrome3/2/2021 1979
http.headers.Permissions-Policy.storage-access 📋Chrome5/2/2023 1188
http.headers.Permissions-Policy.usb 📋Chrome7/25/2017 3295
http.headers.Permissions-Policy.web-share 📋Chrome10/20/2020 2112
http.headers.Permissions-Policy.wildcards Chrome11/29/2022 1342
http.headers.Permissions-Policy.window-management 📋Chrome3/29/2022 1587
http.headers.Permissions-Policy.xr-spatial-tracking 📋Chrome12/10/2019 2427
http.headers.RTT 📋Chrome5/29/2018 2987
Chrome: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.Chrome Android: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.Edge: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.Quest Browser: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.Opera: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.Opera Android: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.Samsung Internet: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.WebView Android: The value is never greater than 3000 ms, as a non-standard anti-fingerprinting measure.
http.headers.Reporting-Endpoints 📋Chrome11/15/2021 Firefox9/3/20241023
http.headers.Save-Data 📋Chrome3/2/2016 3805
http.headers.Sec-Browsing-Topics Chrome7/18/2023 1111
http.headers.Sec-CH-Prefers-Color-Scheme 📋Chrome8/31/2021 1797
http.headers.Sec-CH-Prefers-Reduced-Motion 📋Chrome11/29/2022 1342
http.headers.Sec-CH-Prefers-Reduced-Transparency 📋Chrome10/31/2023 1006
http.headers.Sec-CH-UA 📋Chrome3/2/2021 1979
http.headers.Sec-CH-UA-Arch 📋Chrome3/2/2021 1979
http.headers.Sec-CH-UA-Bitness 📋Chrome8/31/2021 1797
http.headers.Sec-CH-UA-Full-Version-List 📋Chrome2/1/2022 1643
http.headers.Sec-CH-UA-Mobile 📋Chrome3/2/2021 1979
http.headers.Sec-CH-UA-Model 📋Chrome3/2/2021 1979
http.headers.Sec-CH-UA-Platform 📋Chrome3/2/2021 1979
http.headers.Sec-CH-UA-Platform-Version 📋Chrome3/2/2021 1979
http.headers.Sec-Fetch-Dest.fencedframe Chrome7/18/2023 1111
http.headers.Sec-GPC 📋Firefox11/21/2023 985
Firefox: Opt-in to GPC using the Website Privacy Preference setting (about:preferences#privacy) checkbox 'Tell websites not to sell or share my data', or by setting the preference privacy.globalprivacycontrol.enabled to true.
http.headers.Set-Login 📋Chrome12/5/2023 971
http.headers.Speculation-Rules 📋Chrome1/23/2024 922
http.headers.Supports-Loading-Mode 📋Chrome1/10/2023 1300
http.headers.Supports-Loading-Mode.credentialed-prerender Chrome1/10/2023 1300
http.headers.Supports-Loading-Mode.fenced-frames Chrome9/12/2023 1055