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 Edge 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 Edge1/15/2020 2391
http.headers.Accept-CH.Sec-CH-UA Edge3/4/2021 1977
http.headers.Accept-CH.Sec-CH-UA-Arch Edge3/4/2021 1977
http.headers.Accept-CH.Sec-CH-UA-Full-Version Edge3/4/2021 1977
http.headers.Accept-CH.Sec-CH-UA-Mobile Edge3/4/2021 1977
http.headers.Accept-CH.Sec-CH-UA-Model Edge3/4/2021 1977
http.headers.Accept-CH.Sec-CH-UA-Platform Edge3/4/2021 1977
http.headers.Accept-CH.Sec-CH-UA-Platform-Version Edge3/4/2021 1977
http.headers.Attribution-Reporting-Eligible 📋Edge9/15/2023 1052
http.headers.Attribution-Reporting-Register-Source 📋Edge9/15/2023 1052
http.headers.Attribution-Reporting-Register-Trigger 📋Edge9/15/2023 1052
http.headers.Attribution-Reporting-Support 📋Edge9/15/2023 1052
http.headers.Clear-Site-Data.clientHints 📋Edge9/15/2023 1052
http.headers.Content-Security-Policy.fenced-frame-src 📋Edge7/21/2023 1108
http.headers.Content-Security-Policy.require-trusted-types-for 📋Edge5/21/2020 2264
http.headers.Content-Security-Policy.script-src.inline-speculation-rules 📋Edge2/9/2023 1270
http.headers.Content-Security-Policy.trusted-types 📋Edge5/21/2020 2264
http.headers.Critical-CH 📋Edge5/27/2021 1893
http.headers.Cross-Origin-Opener-Policy.noopener-allow-popups 📋Edge11/14/2024 626
http.headers.Downlink 📋Edge1/15/2020 2391
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 📋Edge1/15/2020 2391
http.headers.Early-Data 📋Firefox1/23/2018 3113
http.headers.Link.blocking 📋Edge9/1/2022 1431
http.headers.Link.expect 📋Edge4/18/2024 836
http.headers.NEL 📋Edge1/15/2020 2391
http.headers.No-Vary-Search 📋Edge7/25/2024 738
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 Edge7/21/2023 1108
http.headers.Origin-Agent-Cluster 📋Edge4/15/2021 1935
http.headers.Permissions-Policy 📋Edge1/21/2021 2019
http.headers.Permissions-Policy.accelerometer 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.ambient-light-sensor 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.attribution-reporting 📋Edge9/15/2023 1052
http.headers.Permissions-Policy.autoplay 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.bluetooth 📋Edge8/5/2022 1458
http.headers.Permissions-Policy.browsing-topics Edge7/21/2023 1108
http.headers.Permissions-Policy.camera 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.compute-pressure 📋Edge5/17/2024 807
http.headers.Permissions-Policy.cross-origin-isolated 📋Edge11/19/2020 2082
http.headers.Permissions-Policy.display-capture 📋Edge9/24/2021 1773
http.headers.Permissions-Policy.document-domain 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.encrypted-media 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.fullscreen 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.geolocation 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.gyroscope 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.hid 📋Edge3/4/2021 1977
http.headers.Permissions-Policy.identity-credentials-get 📋Edge2/9/2023 1270
http.headers.Permissions-Policy.idle-detection 📋Edge9/24/2021 1773
http.headers.Permissions-Policy.local-fonts 📋Edge6/23/2022 1501
http.headers.Permissions-Policy.magnetometer 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.microphone 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.midi 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.otp-credentials 📋Edge9/2/2021 1795
http.headers.Permissions-Policy.payment 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.publickey-credentials-create 📋Edge7/16/2020 2208
http.headers.Permissions-Policy.publickey-credentials-get 📋Edge7/16/2020 2208
http.headers.Permissions-Policy.screen-wake-lock 📋Edge7/16/2020 2208
http.headers.Permissions-Policy.serial 📋Edge3/4/2021 1977
http.headers.Permissions-Policy.storage-access 📋Edge5/5/2023 1185
http.headers.Permissions-Policy.usb 📋Edge1/15/2020 2391
http.headers.Permissions-Policy.web-share 📋Edge10/9/2020 2123
http.headers.Permissions-Policy.wildcards Edge12/5/2022 1336
http.headers.Permissions-Policy.window-management 📋Edge4/1/2022 1584
http.headers.Permissions-Policy.xr-spatial-tracking 📋Edge1/15/2020 2391
http.headers.RTT 📋Edge1/15/2020 2391
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 📋Edge11/19/2021 Firefox9/3/20241019
http.headers.Save-Data 📋Edge1/15/2020 2391
http.headers.Sec-Browsing-Topics Edge7/21/2023 1108
http.headers.Sec-CH-Prefers-Color-Scheme 📋Edge9/2/2021 1795
http.headers.Sec-CH-Prefers-Reduced-Motion 📋Edge12/5/2022 1336
http.headers.Sec-CH-Prefers-Reduced-Transparency 📋Edge11/2/2023 1004
http.headers.Sec-CH-UA 📋Edge3/4/2021 1977
http.headers.Sec-CH-UA-Arch 📋Edge3/4/2021 1977
http.headers.Sec-CH-UA-Bitness 📋Edge9/2/2021 1795
http.headers.Sec-CH-UA-Full-Version-List 📋Edge2/3/2022 1641
http.headers.Sec-CH-UA-Mobile 📋Edge3/4/2021 1977
http.headers.Sec-CH-UA-Model 📋Edge3/4/2021 1977
http.headers.Sec-CH-UA-Platform 📋Edge3/4/2021 1977
http.headers.Sec-CH-UA-Platform-Version 📋Edge3/4/2021 1977
http.headers.Sec-Fetch-Dest.fencedframe Edge7/21/2023 1108
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 📋Edge12/7/2023 969
http.headers.Speculation-Rules 📋Edge1/25/2024 920
http.headers.Supports-Loading-Mode 📋Edge1/12/2023 1298
http.headers.Supports-Loading-Mode.credentialed-prerender Edge1/12/2023 1298
http.headers.Supports-Loading-Mode.fenced-frames Edge9/15/2023 1052