Now Stable

"New on the Web": For a given set of browsers, what APIs became stable and when, ordered reverse chronologically.

It's a great source of information for posts like this

Example Comparisons

Stable APIs

Below is a list of features that are in Chrome and Chrome Android, ordered reverse chronologically by when they became stable (i.e, available in the last browser).

2026/1

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.No-Vary-Search.http_cache 📋	Chrome	9/30/2025	Chrome Android	1/13/2026	105

2025/9

API	First Browser	Date	Last Browser	Date	Notes
http.headers.No-Vary-Search 📋	Chrome	9/30/2025	Chrome Android	9/30/2025	Chrome: Before Chrome 127, speculation rules are only supported for navigational prefetch, not prerender.Chrome: Before Chrome 141, HTTP cache is not supported.Chrome Android: Before Chrome Android 127, speculation rules are only supported for navigational prefetch, not prerender.Chrome Android: Before Chrome Android 141, HTTP cache is not supported.Edge: Before Edge 127, speculation rules are only supported for navigational prefetch, not prerender.Edge: Before Edge 141, HTTP cache is not supported.Opera: Before Opera 113, speculation rules are only supported for navigational prefetch, not prerender.Opera: Before Opera 125, HTTP cache is not supported.Opera Android: Before Opera Android 84, speculation rules are only supported for navigational prefetch, not prerender.Opera Android: Before Opera Android 93, HTTP cache is not supported.Samsung Internet: Before Samsung Internet 28.0, speculation rules are only supported for navigational prefetch, not prerender.Samsung Internet: Before Samsung Internet false, HTTP cache is not supported.WebView Android: Before WebView Android 127, speculation rules are only supported for navigational prefetch, not prerender.WebView Android: Before WebView Android 141, HTTP cache is not supported.
http.headers.Permissions-Policy.aria-notify	Chrome	9/30/2025	Chrome Android	9/30/2025	Chrome: Not supported on ChromeOS.Chrome Android: Not supported on ChromeOS.Edge: Not supported on ChromeOS.Opera: Not supported on ChromeOS.Opera Android: Not supported on ChromeOS.WebView Android: Not supported on ChromeOS.
http.headers.Set-Cookie.http_host-http_prefixes	Chrome	9/2/2025	Chrome Android	9/2/2025	Firefox: `__Host-Http-` is supported under its original name `__HostHttp-`. See bug 1982555.Firefox for Android: `__Host-Http-` is supported under its original name `__HostHttp-`. See bug 1982555.

2025/6

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Clear-Site-Data.prefetchCache	Chrome	6/24/2025	Chrome Android	6/24/2025
http.headers.Clear-Site-Data.prerenderCache	Chrome	6/24/2025	Chrome Android	6/24/2025
http.headers.Integrity-Policy 📋	Chrome	6/24/2025	Chrome Android	6/24/2025	Firefox: Reporting `endpoints` are ignored (violations are logged to console).Firefox for Android: Reporting `endpoints` are ignored (violations are logged to console).
http.headers.Integrity-Policy.blocked-destinations_script 📋	Chrome	6/24/2025	Chrome Android	6/24/2025
http.headers.Integrity-Policy-Report-Only 📋	Chrome	6/24/2025	Chrome Android	6/24/2025	Firefox: Reporting `endpoints` are ignored (violations are logged to console).Firefox for Android: Reporting `endpoints` are ignored (violations are logged to console).
http.headers.Integrity-Policy-Report-Only.blocked-destinations_script 📋	Chrome	6/24/2025	Chrome Android	6/24/2025
http.mixed-content.private_network_access 📋	Chrome	6/24/2025	Chrome Android	6/24/2025

2025/4

API	First Browser	Date	Last Browser	Date
http.headers.Sec-Speculation-Tags 📋	Chrome	4/29/2025	Chrome Android	4/29/2025
http.headers.Feature-Policy.deferred-fetch 📋	Chrome	4/1/2025	Chrome Android	4/1/2025
http.headers.Feature-Policy.deferred-fetch-minimal 📋	Chrome	4/1/2025	Chrome Android	4/1/2025
http.headers.Permissions-Policy.deferred-fetch 📋	Chrome	4/1/2025	Chrome Android	4/1/2025
http.headers.Permissions-Policy.deferred-fetch-minimal 📋	Chrome	4/1/2025	Chrome Android	4/1/2025

2025/2

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Activate-Storage-Access 📋	Chrome	2/4/2025	Chrome Android	2/4/2025
http.headers.Sec-Fetch-Storage-Access 📋	Chrome	2/4/2025	Chrome Android	2/4/2025

2024/11

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Cross-Origin-Opener-Policy.noopener-allow-popups 📋	Chrome	11/12/2024	Chrome Android	11/12/2024

2024/10

API	First Browser	Date	Last Browser	Date
http.headers.Accept-Encoding.dcb	Chrome	10/15/2024	Chrome Android	10/15/2024
http.headers.Accept-Encoding.dcz	Chrome	10/15/2024	Chrome Android	10/15/2024
http.headers.Available-Dictionary 📋	Chrome	10/15/2024	Chrome Android	10/15/2024
http.headers.Content-Encoding.dcb	Chrome	10/15/2024	Chrome Android	10/15/2024
http.headers.Content-Encoding.dcz	Chrome	10/15/2024	Chrome Android	10/15/2024
http.headers.Dictionary-ID 📋	Chrome	10/15/2024	Chrome Android	10/15/2024
http.headers.Use-As-Dictionary 📋	Chrome	10/15/2024	Chrome Android	10/15/2024

2024/7

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.No-Vary-Search.speculation_rules_prerender 📋	Chrome	7/23/2024	Chrome Android	7/23/2024

2024/6

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy.fenced-frame-src 📋	Chrome	6/11/2024	Chrome Android	6/11/2024
http.headers.Sec-Fetch-Dest.fencedframe	Chrome	6/11/2024	Chrome Android	6/11/2024

2024/4

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Priority 📋	Chrome	4/16/2024	Chrome Android	4/16/2024
http.headers.Sec-CH-UA-Form-Factors 📋	Chrome	4/16/2024	Chrome Android	4/16/2024

2024/3

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Accept-Encoding.zstd 📋	Chrome	3/19/2024	Chrome Android	3/19/2024		Safari: Before macOS 26.3 Tahoe, this header value is not sent.
http.headers.Content-Encoding.zstd 📋	Chrome	3/19/2024	Chrome Android	3/19/2024		Safari: Before macOS 26.3 Tahoe, Safari cannot decode Zstandard responses.

2024/1

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.No-Vary-Search.speculation_rules_prefetch 📋	Chrome	1/23/2024	Chrome Android	1/23/2024
http.headers.Speculation-Rules 📋	Chrome	1/23/2024	Chrome Android	1/23/2024

2023/12

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Set-Login 📋	Chrome	12/5/2023	Chrome Android	12/5/2023

2023/10

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Sec-CH-Prefers-Reduced-Transparency 📋	Chrome	10/31/2023	Chrome Android	10/31/2023

2023/9

API	First Browser	Date	Last Browser	Date
http.headers.Attribution-Reporting-Eligible 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Attribution-Reporting-Register-Source 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Attribution-Reporting-Register-Trigger 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Attribution-Reporting-Support 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Authorization.Digest.SHA-256	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Clear-Site-Data.clientHints 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Clear-Site-Data.wildcard 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Feature-Policy.attribution-reporting 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Permissions-Policy.attribution-reporting 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Permissions-Policy.private-state-token-issuance 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Permissions-Policy.private-state-token-redemption 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Sec-Private-State-Token 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Sec-Private-State-Token-Crypto-Version 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Sec-Private-State-Token-Lifetime 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Sec-Redemption-Record 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.Supports-Loading-Mode.fenced-frame 📋	Chrome	9/12/2023	Chrome Android	9/12/2023
http.headers.WWW-Authenticate.Digest.SHA-256	Chrome	9/12/2023	Chrome Android	9/12/2023

2023/7

API	First Browser	Date	Last Browser	Date	Days
http.headers.Feature-Policy.browsing-topics	Chrome	7/18/2023	Chrome Android	7/21/2023	3
http.headers.Observe-Browsing-Topics	Chrome	7/18/2023	Chrome Android	7/21/2023	3
http.headers.Permissions-Policy.browsing-topics	Chrome	7/18/2023	Chrome Android	7/21/2023	3
http.headers.Sec-Browsing-Topics	Chrome	7/18/2023	Chrome Android	7/21/2023	3

2023/5

API	First Browser	Date	Last Browser	Date
http.headers.Set-Cookie.Partitioned 📋	Chrome	5/30/2023	Chrome Android	5/30/2023
http.headers.Feature-Policy.storage-access 📋	Chrome	5/2/2023	Chrome Android	5/2/2023
http.headers.Permissions-Policy.storage-access 📋	Chrome	5/2/2023	Chrome Android	5/2/2023

2023/2

API	First Browser	Date	Last Browser	Date
http.headers.Content-Security-Policy.script-src.inline-speculation-rules	Chrome	2/7/2023	Chrome Android	2/7/2023
http.headers.Feature-Policy.identity-credentials-get 📋	Chrome	2/7/2023	Chrome Android	2/7/2023
http.headers.Permissions-Policy.identity-credentials-get 📋	Chrome	2/7/2023	Chrome Android	2/7/2023
http.headers.Sec-Purpose 📋	Chrome	2/7/2023	Chrome Android	2/7/2023
http.headers.Sec-Purpose.speculationrules	Chrome	2/7/2023	Chrome Android	2/7/2023

2023/1

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Supports-Loading-Mode 📋	Chrome	1/10/2023	Chrome Android	1/10/2023
http.headers.Supports-Loading-Mode.credentialed-prerender 📋	Chrome	1/10/2023	Chrome Android	1/10/2023

2022/11

API	First Browser	Date	Last Browser	Date
http.headers.Feature-Policy.wildcards	Chrome	11/29/2022	Chrome Android	11/29/2022
http.headers.Permissions-Policy.wildcards	Chrome	11/29/2022	Chrome Android	11/29/2022
http.headers.Sec-CH-Prefers-Reduced-Motion 📋	Chrome	11/29/2022	Chrome Android	11/29/2022

2022/9

API	First Browser	Date	Last Browser	Date	Days
http.headers.Accept-CH.Sec-CH-Viewport-Height 📋	Chrome	9/2/2022	Chrome Android	9/2/2022
http.headers.Feature-Policy.picture-in-picture 📋	Chrome	9/4/2018	Chrome Android	9/2/2022	1459
http.headers.Permissions-Policy.picture-in-picture 📋	Chrome	1/19/2021	Chrome Android	9/2/2022	591
http.headers.Sec-CH-Viewport-Height 📋	Chrome	9/2/2022	Chrome Android	9/2/2022

2022/8

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Feature-Policy.bluetooth 📋	Chrome	8/2/2022	Chrome Android	8/2/2022
http.headers.Permissions-Policy.bluetooth 📋	Chrome	8/2/2022	Chrome Android	8/2/2022

2022/6

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Link 📋	Chrome	6/21/2022	Chrome Android	6/21/2022
http.headers.Link.fetchpriority 📋	Chrome	6/21/2022	Chrome Android	6/21/2022
http.headers.Permissions-Policy.gamepad 📋	Chrome	6/21/2022	Chrome Android	6/21/2022
http.status.103 📋	Chrome	6/21/2022	Chrome Android	6/21/2022	Chrome: Supported in HTTP/2 and later only.Chrome Android: Supported in HTTP/2 and later only.Edge: Supported in HTTP/2 and later only.Quest Browser: Supported in HTTP/2 and later only.Opera: Supported in HTTP/2 and later only.Opera Android: Supported in HTTP/2 and later only.Safari: Supported in HTTP/2 and later only.Safari on iOS: Supported in HTTP/2 and later only.Samsung Internet: Supported in HTTP/2 and later only.WebView Android: Supported in HTTP/2 and later only.WebView on iOS: Supported in HTTP/2 and later only.
http.status.103.preconnect	Chrome	6/21/2022	Chrome Android	6/21/2022
http.status.103.preload	Chrome	6/21/2022	Chrome Android	6/21/2022

2022/3

API	First Browser	Date	Last Browser	Date
http.headers.Feature-Policy.window-management 📋	Chrome	3/29/2022	Chrome Android	3/29/2022
http.headers.Permissions-Policy.window-management 📋	Chrome	3/29/2022	Chrome Android	3/29/2022
http.headers.Sec-CH-UA-WoW64 📋	Chrome	3/29/2022	Chrome Android	3/29/2022
http.headers.Range.cors_safe	Chrome	3/1/2022	Chrome Android	3/1/2022

2022/2

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Sec-CH-UA-Full-Version-List 📋	Chrome	2/1/2022	Chrome Android	2/1/2022

2022/1

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Accept-CH.Sec-CH-DPR 📋	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Accept-CH.Sec-CH-Device-Memory 📋	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Accept-CH.Sec-CH-Viewport-Width 📋	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Accept-CH.Sec-CH-Width 📋	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Content-Security-Policy.script-src.wasm-unsafe-eval	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Sec-CH-DPR 📋	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Sec-CH-Device-Memory 📋	Chrome	1/4/2022	Chrome Android	1/4/2022	Chrome: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Chrome: From Chrome 147, reported values are 2, 4, 8, 16, and 32.Chrome: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Chrome: From Chrome 147, reported values are 2, 4, 8, 16, and 32.Chrome Android: From Chrome 147, reported values are 1, 2, 4, and 8.Chrome Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Chrome Android: From Chrome 147, reported values are 1, 2, 4, and 8.Chrome Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Edge: Before Edge 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Edge: From Edge 147, reported values are 2, 4, 8, 16, and 32.Edge: Before Edge 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Edge: From Edge 147, reported values are 2, 4, 8, 16, and 32.Quest Browser: From Chrome 147, reported values are 1, 2, 4, and 8.Quest Browser: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Quest Browser: From Chrome 147, reported values are 1, 2, 4, and 8.Quest Browser: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Opera: Before Opera false, reported values were 0.25, 0.5, 1, 2, 4, and 8.Opera: From Opera false, reported values are 2, 4, 8, 16, and 32.Opera: Before Opera false, reported values were 0.25, 0.5, 1, 2, 4, and 8.Opera: From Opera false, reported values are 2, 4, 8, 16, and 32.Opera Android: From Chrome 147, reported values are 1, 2, 4, and 8.Opera Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Opera Android: From Chrome 147, reported values are 1, 2, 4, and 8.Opera Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Samsung Internet: From Chrome 147, reported values are 1, 2, 4, and 8.Samsung Internet: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Samsung Internet: From Chrome 147, reported values are 1, 2, 4, and 8.Samsung Internet: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.WebView Android: From Chrome 147, reported values are 1, 2, 4, and 8.WebView Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.WebView Android: From Chrome 147, reported values are 1, 2, 4, and 8.WebView Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.
http.headers.Sec-CH-Viewport-Width 📋	Chrome	1/4/2022	Chrome Android	1/4/2022
http.headers.Sec-CH-Width 📋	Chrome	1/4/2022	Chrome Android	1/4/2022

2021/11

API	First Browser	Date	Last Browser	Date
http.headers.Cross-Origin-Embedder-Policy.credentialless 📋	Chrome	11/15/2021	Chrome Android	11/15/2021
http.headers.Cross-Origin-Embedder-Policy.report-to_parameter 📋	Chrome	11/15/2021	Chrome Android	11/15/2021
http.headers.Cross-Origin-Opener-Policy.report-to_parameter 📋	Chrome	11/15/2021	Chrome Android	11/15/2021
http.headers.Reporting-Endpoints 📋	Chrome	11/15/2021	Chrome Android	11/15/2021

2021/9

API	First Browser	Date	Last Browser	Date
http.headers.Feature-Policy.display-capture 📋	Chrome	9/21/2021	Chrome Android	9/21/2021
http.headers.Feature-Policy.idle-detection 📋	Chrome	9/21/2021	Chrome Android	9/21/2021
http.headers.Permissions-Policy.display-capture 📋	Chrome	9/21/2021	Chrome Android	9/21/2021
http.headers.Permissions-Policy.idle-detection 📋	Chrome	9/21/2021	Chrome Android	9/21/2021

2021/8

API	First Browser	Date	Last Browser	Date	Days
http.headers.Feature-Policy.otp-credentials 📋	Chrome Android	7/27/2020	Chrome	8/31/2021	400
http.headers.Permissions-Policy.otp-credentials 📋	Chrome Android	1/19/2021	Chrome	8/31/2021	224
http.headers.Sec-CH-Prefers-Color-Scheme 📋	Chrome	8/31/2021	Chrome Android	8/31/2021
http.headers.Sec-CH-UA-Bitness 📋	Chrome	8/31/2021	Chrome Android	8/31/2021

2021/7

API	First Browser	Date	Last Browser	Date	Days	Notes
http.mixed-content.block_mixed_downloads 📋	Chrome	7/20/2021	Chrome Android	7/20/2021

2021/5

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Critical-CH 📋	Chrome	5/25/2021	Chrome Android	5/25/2021
http.headers.Set-Cookie.SameSite.schemeful	Chrome	5/25/2021	Chrome Android	5/25/2021

2021/4

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Origin-Agent-Cluster 📋	Chrome	4/13/2021	Chrome Android	4/13/2021

2021/3

API	First Browser	Date	Last Browser	Date
http.headers.Accept-CH.Sec-CH-UA	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Accept-CH.Sec-CH-UA-Arch	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Accept-CH.Sec-CH-UA-Full-Version	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Accept-CH.Sec-CH-UA-Mobile	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Accept-CH.Sec-CH-UA-Model	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Accept-CH.Sec-CH-UA-Platform	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Accept-CH.Sec-CH-UA-Platform-Version	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Feature-Policy.serial 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Permissions-Policy.serial 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA-Arch 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA-Full-Version 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA-Mobile 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA-Model 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA-Platform 📋	Chrome	3/2/2021	Chrome Android	3/2/2021
http.headers.Sec-CH-UA-Platform-Version 📋	Chrome	3/2/2021	Chrome Android	3/2/2021

2021/1

API	First Browser	Date	Last Browser	Date
http.headers.Permissions-Policy 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.accelerometer 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.autoplay 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.camera 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.cross-origin-isolated 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.encrypted-media 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.fullscreen 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.geolocation 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.gyroscope 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.microphone 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.midi 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.payment 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.publickey-credentials-create 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.publickey-credentials-get 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.screen-wake-lock 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.usb 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.web-share 📋	Chrome	1/19/2021	Chrome Android	1/19/2021
http.headers.Permissions-Policy.xr-spatial-tracking 📋	Chrome	1/19/2021	Chrome Android	1/19/2021

2020/11

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Feature-Policy.cross-origin-isolated 📋	Chrome	11/17/2020	Chrome Android	11/17/2020

2020/10

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Feature-Policy.web-share 📋	Chrome	10/20/2020	Chrome Android	10/20/2020
http.mixed-content.auto_upgrade_images 📋	Chrome	10/20/2020	Chrome Android	10/20/2020		Firefox: Set `security.mixed_content.upgrade_display_content` preference to `true` to allow HTTP fetching and display of upgradable content.Firefox: Set `security.mixed_content.block_display_content` preference to `true` to block all mixed content.Firefox for Android: Set `security.mixed_content.upgrade_display_content` preference to `true` to allow HTTP fetching and display of upgradable content.Firefox for Android: Set `security.mixed_content.block_display_content` preference to `true` to block all mixed content.

2020/8

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Referrer-Policy.default_strict-origin-when-cross-origin	Chrome	8/25/2020	Chrome Android	8/25/2020

2020/7

API	First Browser	Date	Last Browser	Date
http.headers.Feature-Policy.publickey-credentials-create 📋	Chrome	7/27/2020	Chrome Android	7/27/2020
http.headers.Feature-Policy.publickey-credentials-get 📋	Chrome	7/27/2020	Chrome Android	7/27/2020
http.headers.Feature-Policy.screen-wake-lock 📋	Chrome	7/27/2020	Chrome Android	7/27/2020

2020/5

API	First Browser	Date	Last Browser	Date
http.headers.Content-Security-Policy.require-trusted-types-for 📋	Chrome	5/19/2020	Chrome Android	5/19/2020
http.headers.Content-Security-Policy.trusted-types 📋	Chrome	5/19/2020	Chrome Android	5/19/2020
http.headers.Cross-Origin-Embedder-Policy 📋	Chrome	5/19/2020	Chrome Android	5/19/2020
http.headers.Cross-Origin-Opener-Policy 📋	Chrome	5/19/2020	Chrome Android	5/19/2020

2020/2

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Sec-Fetch-Dest 📋	Chrome	2/4/2020	Chrome Android	2/4/2020
http.headers.Set-Cookie.SameSite.Lax_default	Chrome	2/4/2020	Chrome Android	2/4/2020
http.headers.Set-Cookie.SameSite.none_requires_secure	Chrome	2/4/2020	Chrome Android	2/4/2020
http.mixed-content.auto_upgrade_video_audio 📋	Chrome	2/4/2020	Chrome Android	2/4/2020	Firefox: Set `security.mixed_content.upgrade_display_content` preference to `true` to allow HTTP fetching and display of upgradable content.Firefox: Set `security.mixed_content.block_display_content` preference to `true` to block all mixed content.Firefox for Android: Set `security.mixed_content.upgrade_display_content` preference to `true` to allow HTTP fetching and display of upgradable content.Firefox for Android: Set `security.mixed_content.block_display_content` preference to `true` to block all mixed content.

2019/12

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Feature-Policy.xr-spatial-tracking 📋	Chrome	12/10/2019	Chrome Android	12/17/2019	7
http.mixed-content 📋	Chrome	12/10/2019	Chrome Android	12/17/2019	7
http.mixed-content.allow_file_urls 📋	Chrome	12/10/2019	Chrome Android	12/17/2019	7
http.mixed-content.allow_localhost_url 📋	Chrome	12/10/2019	Chrome Android	12/17/2019	7
http.mixed-content.allow_loopback_url 📋	Chrome	12/10/2019	Chrome Android	12/17/2019	7
http.mixed-content.blockable_mixed_content 📋	Chrome	12/10/2019	Chrome Android	12/17/2019	7	Chrome: From version 79 blocks iframes, scripts, and stylesheets.Chrome Android: From version 79 blocks iframes, scripts, and stylesheets.Edge: From version 79 blocks iframes, scripts, and stylesheets.Quest Browser: From version 8.0 blocks iframes, scripts, and stylesheets.Opera: From version 66 blocks iframes, scripts, and stylesheets.Opera Android: From version 57 blocks iframes, scripts, and stylesheets.Samsung Internet: From version 12.0 blocks iframes, scripts, and stylesheets.WebView Android: From version 79 blocks iframes, scripts, and stylesheets.

2019/9

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Referer.length_limit_4096B	Chrome	9/10/2019	Chrome Android	9/10/2019

2019/7

API	First Browser	Date	Last Browser	Date
http.headers.Content-Length.cors_response_safelist	Chrome	7/30/2019	Chrome Android	7/30/2019
http.headers.Sec-Fetch-Mode 📋	Chrome	7/30/2019	Chrome Android	7/30/2019
http.headers.Sec-Fetch-Site 📋	Chrome	7/30/2019	Chrome Android	7/30/2019
http.headers.Sec-Fetch-User 📋	Chrome	7/30/2019	Chrome Android	7/30/2019

2019/6

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Cache-Control.stale-while-revalidate 📋	Chrome	6/4/2019	Chrome Android	6/4/2019
http.headers.Content-Security-Policy.script-src-attr 📋	Chrome	6/4/2019	Chrome Android	6/4/2019
http.headers.Content-Security-Policy.script-src-elem 📋	Chrome	6/4/2019	Chrome Android	6/4/2019
http.headers.Content-Security-Policy.style-src-attr 📋	Chrome	6/4/2019	Chrome Android	6/4/2019
http.headers.Content-Security-Policy.style-src-elem 📋	Chrome	6/4/2019	Chrome Android	6/4/2019	Safari: The `style-src-elem` directive was parsed, but had no effect. See bug 276931.Safari on iOS: The `style-src-elem` directive was parsed, but had no effect. See bug 276931.WebView on iOS: The `style-src-elem` directive was parsed, but had no effect. See bug 276931.

2019/3

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Cross-Origin-Resource-Policy 📋	Chrome	3/12/2019	Chrome Android	3/12/2019		Chrome: Until version 75, downloads for files with this header would fail in Chrome. See bug 41452948.Chrome: From version 80 to 85, linearized PDFs served inline with this header fail to render properly. See bug 40127935. From version 86, partial PDF loading is disabled.Chrome Android: Until version 75, downloads for files with this header would fail in Chrome Android. See bug 41452948.Chrome Android: From version 80 to 85, linearized PDFs served inline with this header fail to render properly. See bug 40127935. From version 86, partial PDF loading is disabled.Quest Browser: Until version 7.0, downloads for files with this header would fail in Quest Browser. See bug 41452948.Quest Browser: From version 9.0 to 85, linearized PDFs served inline with this header fail to render properly. See bug 40127935. From version 12.0, partial PDF loading is disabled.Opera: Until version 62, downloads for files with this header would fail in Opera. See bug 41452948.Opera: From version 67 to 85, linearized PDFs served inline with this header fail to render properly. See bug 40127935. From version 72, partial PDF loading is disabled.Opera Android: Until version 54, downloads for files with this header would fail in Opera Android. See bug 41452948.Opera Android: From version 57 to 85, linearized PDFs served inline with this header fail to render properly. See bug 40127935. From version 61, partial PDF loading is disabled.WebView Android: Until version 75, downloads for files with this header would fail in WebView Android. See bug 41452948.WebView Android: From version 80 to 85, linearized PDFs served inline with this header fail to render properly. See bug 40127935. From version 86, partial PDF loading is disabled.

2018/12

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.NEL 📋	Chrome	12/4/2018	Chrome Android	12/4/2018

2018/10

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy.report-to 📋	Chrome	10/16/2018	Chrome Android	10/17/2018	1
http.headers.Report-To	Chrome	10/16/2018	Chrome Android	10/17/2018	1

2018/9

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy.unsafe-hashes	Chrome	9/4/2018	Chrome Android	9/4/2018

2018/5

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Downlink 📋	Chrome	5/29/2018	Chrome Android	5/31/2018	2	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 📋	Chrome	5/29/2018	Chrome Android	5/31/2018	2
http.headers.RTT 📋	Chrome	5/29/2018	Chrome Android	5/31/2018	2	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.Set-Cookie.SameSite.None	Chrome	5/29/2018	Chrome Android	5/31/2018	2	Chrome: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.Chrome Android: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.Quest Browser: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.Opera: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.Opera Android: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.Safari: Not supported before macOS version 10.15 (Catalina).Samsung Internet: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.WebView Android: Rejects cookies with `SameSite=None`. See SameSite=None: Known Incompatible Clients.

2018/4

API	First Browser	Date	Last Browser	Date
http.headers.Feature-Policy.accelerometer 📋	Chrome	4/17/2018	Chrome Android	4/17/2018
http.headers.Feature-Policy.ambient-light-sensor 📋	Chrome	4/17/2018	Chrome Android	4/17/2018
http.headers.Feature-Policy.gyroscope 📋	Chrome	4/17/2018	Chrome Android	4/17/2018
http.headers.Feature-Policy.magnetometer 📋	Chrome	4/17/2018	Chrome Android	4/17/2018
http.headers.Permissions-Policy.ambient-light-sensor 📋	Chrome	4/17/2018	Chrome Android	4/17/2018
http.headers.Permissions-Policy.magnetometer 📋	Chrome	4/17/2018	Chrome Android	4/17/2018

2018/3

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Access-Control-Expose-Headers.wildcard	Chrome	3/6/2018	Chrome Android	3/6/2018
http.headers.Clear-Site-Data.cache 📋	Chrome	3/6/2018	Chrome Android	3/6/2018	Chrome: Setting this value may increase response duration (see bug 40233601.Chrome: Setting this value may prevent a page from fully load (see bug 41343050.Chrome Android: Setting this value may increase response duration (see bug 40233601.Chrome Android: Setting this value may prevent a page from fully load (see bug 41343050.Edge: Setting this value may increase response duration (see bug 40233601.Quest Browser: Setting this value may increase response duration (see bug 40233601.Opera: Setting this value may increase response duration (see bug 40233601.Opera: Setting this value may prevent a page from fully load (see bug 41343050.Opera Android: Setting this value may increase response duration (see bug 40233601.Opera Android: Setting this value may prevent a page from fully load (see bug 41343050.Samsung Internet: Setting this value may increase response duration (see bug 40233601.WebView Android: Setting this value may increase response duration (see bug 40233601.WebView Android: Setting this value may prevent a page from fully load (see bug 41343050.
http.headers.Server-Timing 📋	Chrome	3/6/2018	Chrome Android	3/6/2018

2018/1

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Feature-Policy.autoplay 📋	Chrome	1/23/2018	Chrome Android	1/23/2018
http.headers.Feature-Policy.camera 📋	Chrome	1/23/2018	Chrome Android	1/23/2018
http.headers.Feature-Policy.encrypted-media 📋	Chrome	1/23/2018	Chrome Android	1/23/2018
http.headers.Feature-Policy.geolocation 📋	Chrome	1/23/2018	Chrome Android	1/23/2018
http.headers.Feature-Policy.microphone 📋	Chrome	1/23/2018	Chrome Android	1/23/2018
http.headers.Feature-Policy.midi 📋	Chrome	1/23/2018	Chrome Android	1/23/2018
http.headers.X-Content-Type-Options 📋	Chrome	1/23/2018	Chrome Android	1/23/2018	Chrome: Not supported for stylesheets.Chrome Android: Not supported for stylesheets.Opera: Not supported for stylesheets.Opera Android: Not supported for stylesheets.Samsung Internet: Not supported for stylesheets.WebView Android: Not supported for stylesheets.

2017/12

API	First Browser	Date	Last Browser	Date	Days
http.headers.Access-Control-Allow-Headers.wildcard	Chrome Android	12/5/2017	Chrome	12/6/2017	1
http.headers.Access-Control-Allow-Methods.wildcard	Chrome Android	12/5/2017	Chrome	12/6/2017	1
http.headers.Content-Security-Policy.form-action.blocks_redirects	Chrome Android	12/5/2017	Chrome	12/6/2017	1
http.headers.Snapshot-Content-Location	Chrome Android	12/5/2017	Chrome	12/6/2017	1

2017/10

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Feature-Policy.fullscreen 📋	Chrome	10/17/2017	Chrome Android	10/24/2017	7

2017/9

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Accept-CH.Device-Memory	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Clear-Site-Data 📋	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Clear-Site-Data.cookies 📋	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Clear-Site-Data.secure_context_required	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Clear-Site-Data.storage 📋	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Device-Memory	Chrome	9/5/2017	Chrome Android	9/5/2017	Chrome: From Chrome 147, reported values are 2, 4, 8, 16, and 32.Chrome: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Chrome Android: From Chrome 147, reported values are 1, 2, 4, and 8.Chrome Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Edge: From Edge 147, reported values are 2, 4, 8, 16, and 32.Edge: Before Edge 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Quest Browser: From Chrome 147, reported values are 1, 2, 4, and 8.Quest Browser: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Opera: From Opera false, reported values are 2, 4, 8, 16, and 32.Opera: Before Opera false, reported values were 0.25, 0.5, 1, 2, 4, and 8.Opera Android: From Chrome 147, reported values are 1, 2, 4, and 8.Opera Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.Samsung Internet: From Chrome 147, reported values are 1, 2, 4, and 8.Samsung Internet: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.WebView Android: From Chrome 147, reported values are 1, 2, 4, and 8.WebView Android: Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.
http.headers.Referrer-Policy.same-origin	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Referrer-Policy.strict-origin	Chrome	9/5/2017	Chrome Android	9/5/2017
http.headers.Referrer-Policy.strict-origin-when-cross-origin	Chrome	9/5/2017	Chrome Android	9/5/2017

2017/8

API	First Browser	Date	Last Browser	Date	Days
http.data-url.top_level_navigation_blocked	Chrome	7/25/2017	Chrome Android	8/1/2017	7
http.headers.Feature-Policy	Chrome	7/25/2017	Chrome Android	8/1/2017	7
http.headers.Feature-Policy.payment 📋	Chrome	7/25/2017	Chrome Android	8/1/2017	7
http.headers.Feature-Policy.usb 📋	Chrome	7/25/2017	Chrome Android	8/1/2017	7

2017/6

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy.report-sample	Chrome	6/5/2017	Chrome Android	6/6/2017	1
http.headers.Content-Security-Policy.script-src.external_scripts 📋	Chrome	6/5/2017	Chrome Android	6/6/2017	1
http.headers.Content-Security-Policy.worker-src 📋	Chrome	6/5/2017	Chrome Android	6/6/2017	1	Chrome: Chrome 59 and higher skips the deprecated `child-src` directive.Chrome Android: Chrome Android 59 and higher skips the deprecated `child-src` directive.Quest Browser: Quest Browser 5.0 and higher skips the deprecated `child-src` directive.Opera: Opera 46 and higher skips the deprecated `child-src` directive.Opera Android: Opera Android 43 and higher skips the deprecated `child-src` directive.WebView Android: WebView Android 59 and higher skips the deprecated `child-src` directive.
http.headers.Service-Worker-Navigation-Preload 📋	Chrome	6/5/2017	Chrome Android	6/6/2017	1

2017/2

API	First Browser	Date	Last Browser	Date	Days
http.headers.Content-Security-Policy.worker_support	Chrome	1/25/2017	Chrome Android	2/1/2017	7
http.headers.Referrer-Policy 📋	Chrome	1/25/2017	Chrome Android	2/1/2017	7
http.headers.Referrer-Policy.no-referrer-when-downgrade	Chrome	1/25/2017	Chrome Android	2/1/2017	7
http.headers.Referrer-Policy.origin-when-cross-origin	Chrome	1/25/2017	Chrome Android	2/1/2017	7
http.headers.Referrer-Policy.unsafe-url	Chrome	1/25/2017	Chrome Android	2/1/2017	7

2016/10

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Timing-Allow-Origin 📋	Chrome	10/12/2016	Chrome Android	10/19/2016	7

2016/7

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Alt-Svc 📋	Chrome	7/20/2016	Chrome Android	7/27/2016	7	Firefox: Only supports draft-04Firefox for Android: Only supports draft-04
http.headers.Content-Security-Policy.strict-dynamic	Chrome	7/20/2016	Chrome Android	7/27/2016	7

2016/6

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Accept-Encoding.br 📋	Chrome	4/13/2016	Chrome Android	6/8/2016	56	Safari: Unsupported before macOS 10.13 High Sierra.
http.headers.Content-Encoding.br 📋	Chrome	4/13/2016	Chrome Android	6/8/2016	56	Safari: Unsupported before macOS 10.13 High Sierra.
http.headers.Set-Cookie.SameSite 📋	Chrome	5/25/2016	Chrome Android	6/8/2016	14	Safari: Safari 13 on macOS 10.14 (Mojave), treats `SameSite=None` and invalid values as `Strict`. This is fixed in version 10.15 (Catalina) and later.Safari: Treats `SameSite=None` and invalid values as `Strict` in macOS before 10.15 Catalina. See bug 198181.Safari on iOS: Treats `SameSite=None` and invalid values as `Strict` in iOS before 13. See bug 198181.WebView on iOS: Treats `SameSite=None` and invalid values as `Strict` in iOS before 13. See bug 198181.
http.headers.Set-Cookie.SameSite.Lax	Chrome	5/25/2016	Chrome Android	6/8/2016	14
http.headers.Set-Cookie.SameSite.Strict	Chrome	5/25/2016	Chrome Android	6/8/2016	14

2016/3

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Save-Data 📋	Chrome	3/2/2016	Chrome Android	3/9/2016	7
http.headers.Set-Cookie.host_secure_prefixes	Chrome	3/2/2016	Chrome Android	3/9/2016	7

2015/10

API	First Browser	Date	Last Browser	Date	Days
http.headers.Accept-CH 📋	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Accept-CH.Content-DPR	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Accept-CH.DPR	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Accept-CH.Viewport-Width	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Accept-CH.Width	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Content-DPR	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.DPR	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Viewport-Width	Chrome	10/13/2015	Chrome Android	10/14/2015	1
http.headers.Width	Chrome	10/13/2015	Chrome Android	10/14/2015	1

2015/7

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy.block-all-mixed-content	Chrome	7/21/2015	Chrome Android	7/29/2015	8	Chrome: Will be removed, see bug 40260100.Chrome Android: Will be removed, see bug 40260100.Edge: Will be removed, see bug 40260100.Quest Browser: Will be removed, see bug 40260100.Opera: Will be removed, see bug 40260100.Opera Android: Will be removed, see bug 40260100.Samsung Internet: Will be removed, see bug 40260100.WebView Android: Will be removed, see bug 40260100.
http.headers.Upgrade-Insecure-Requests 📋	Chrome	7/21/2015	Chrome Android	7/29/2015	8

2015/5

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy.upgrade-insecure-requests 📋	Chrome	5/19/2015	Chrome Android	5/27/2015	8

2015/4

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Service-Worker-Allowed 📋	Chrome	4/14/2015	Chrome Android	4/15/2015	1

2015/1

API	First Browser	Date	Last Browser	Date	Notes
http.headers.Content-Security-Policy.base-uri 📋	Chrome	1/21/2015	Chrome Android	1/21/2015
http.headers.Content-Security-Policy.child-src 📋	Chrome	1/21/2015	Chrome Android	1/21/2015
http.headers.Content-Security-Policy.form-action 📋	Chrome	1/21/2015	Chrome Android	1/21/2015
http.headers.Content-Security-Policy.frame-ancestors 📋	Chrome	1/21/2015	Chrome Android	1/21/2015	Firefox: Before Firefox 58, `frame-ancestors` is ignored in `Content-Security-Policy-Report-Only`.Firefox for Android: Before Firefox for Android 58, `frame-ancestors` is ignored in `Content-Security-Policy-Report-Only`.
http.headers.Content-Security-Policy.manifest-src 📋	Chrome	1/21/2015	Chrome Android	1/21/2015

2014/10

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Service-Worker 📋	Chrome	10/7/2014	Chrome Android	10/8/2014	1

2014/7

API	First Browser	Date	Last Browser	Date	Days	Notes
http.status.308 📋	Chrome	7/16/2014	Chrome Android	7/16/2014		Internet Explorer: Does not work below Windows 10.

2013/2

API	First Browser	Date	Last Browser	Date	Days	Notes
http.headers.Content-Security-Policy 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6	Internet Explorer: Only supporting 'sandbox' directive.
http.headers.Content-Security-Policy.connect-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6	Firefox: Before Firefox 50, ping attributes of <a> elements weren't covered by connect-src.
http.headers.Content-Security-Policy.default-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.font-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.frame-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.img-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.media-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.meta-element-support	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.object-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.report-uri 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.sandbox 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.script-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy.style-src 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.Content-Security-Policy-Report-Only 📋	Chrome	2/21/2013	Chrome Android	2/27/2013	6
http.headers.DNT	Chrome	11/6/2012	Chrome Android	2/27/2013	113
http.headers.Retry-After 📋	Chrome	1/10/2013	Chrome Android	2/27/2013	48

2012/6

API	First Browser	Date	Last Browser	Date	Days	Notes
http.data-url 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884	Edge: Before Edge 79, the maximum size supported is 4GB.Internet Explorer: Since Internet Explorer 9, the maximum size supported is 4GB.Internet Explorer: In Internet Explorer 8, the maximum size supported is 32kB.
http.data-url.css_files	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.data-url.html_files	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.data-url.js_files	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Accept 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294	Firefox: In Firefox 66, the default `Accept` header value changed to `/`.Firefox for Android: In Firefox for Android 66, the default `Accept` header value changed to `/`.
http.headers.Accept-Encoding 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Accept-Language 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Accept-Ranges 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Access-Control-Allow-Credentials 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Allow-Headers 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Allow-Methods 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Allow-Origin 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Expose-Headers 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Max-Age 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Request-Headers 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Access-Control-Request-Method 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.Age 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Authorization 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Authorization.Basic 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Authorization.Digest 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Authorization.Digest.md5	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Authorization.NTLM	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Authorization.Negotiate 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Cache-Control 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Connection 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Content-Disposition 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294	Chrome: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.Chrome Android: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.Firefox: From version 82, if an `<a>` element's `download` attribute is set (for a same-origin URL) then the `inline` directive is ignored. Earlier versions did not match the specification and respected the header directive over the attribute. See bug 1658877.Firefox for Android: From version 82, if an `<a>` element's `download` attribute is set (for a same-origin URL) then the `inline` directive is ignored. Earlier versions did not match the specification and respected the header directive over the attribute. See bug 1658877.Quest Browser: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.Opera: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.Opera Android: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.Safari: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 18384.Safari on iOS: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 18384.Samsung Internet: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.WebView Android: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 352093465.WebView on iOS: When saving documents, the document title is used instead of the `filename` parameter if the disposition type is `inline`. See bug 18384.
http.headers.Content-Encoding 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Content-Language 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Content-Length 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Content-Location 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Content-Range 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Content-Type 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Cookie 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294	Safari: Cookies with `Secure` flag are not sent to unsecured `http://localhost/` endpoints. See bug 281149.Safari on iOS: Cookies with `Secure` flag are not sent to unsecured `http://localhost/` endpoints. See bug 281149.WebView on iOS: Cookies with `Secure` flag are not sent to unsecured `http://localhost/` endpoints. See bug 281149.
http.headers.Date 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.ETag 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Expires 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.From 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Host 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.If-Match 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.If-Modified-Since 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.If-None-Match 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.If-Range 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.If-Unmodified-Since 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Keep-Alive 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Last-Modified 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Location 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Origin 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294	Edge: Not sent with `POST` requestsFirefox: Not sent with `POST` requests, see bug 446344.Firefox for Android: Not sent with `POST` requests, see bug 446344.
http.headers.Pragma 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Proxy-Authenticate 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Range 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Referer 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Refresh 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294	Firefox: From version 136 the HTTP `Referer` header is sent following a refresh that redirects to another page (if permitted)Firefox for Android: From version 136 the HTTP `Referer` header is sent following a refresh that redirects to another page (if permitted)
http.headers.Sec-WebSocket-Accept 📋	Chrome	12/13/2011	Chrome Android	6/27/2012	197
http.headers.Sec-WebSocket-Extensions 📋	Chrome	12/13/2011	Chrome Android	6/27/2012	197
http.headers.Sec-WebSocket-Key 📋	Chrome	12/13/2011	Chrome Android	6/27/2012	197
http.headers.Sec-WebSocket-Protocol 📋	Chrome	12/13/2011	Chrome Android	6/27/2012	197
http.headers.Sec-WebSocket-Version 📋	Chrome	12/13/2011	Chrome Android	6/27/2012	197
http.headers.Server 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Set-Cookie 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294	Safari: Cookies with `Secure` flag are not sent to unsecured `http://localhost/` endpoints. See bug 281149.Safari on iOS: Cookies with `Secure` flag are not sent to unsecured `http://localhost/` endpoints. See bug 281149.WebView on iOS: Cookies with `Secure` flag are not sent to unsecured `http://localhost/` endpoints. See bug 281149.
http.headers.Set-Cookie.HttpOnly	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Set-Cookie.Max-Age	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.SourceMap 📋	Chrome	3/28/2012	Chrome Android	6/27/2012	91	Chrome: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.Chrome Android: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.Edge: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.Quest Browser: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.Opera: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.Opera Android: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.Samsung Internet: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.WebView Android: Not supported for ECMAScript Modules (`<script type="module">`). See bug 40854862.
http.headers.Strict-Transport-Security 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.TE 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Transfer-Encoding 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Upgrade 📋	Chrome	5/25/2010	Chrome Android	6/27/2012	764
http.headers.User-Agent 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Vary 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Via 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.WWW-Authenticate 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.WWW-Authenticate.Basic 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.WWW-Authenticate.Digest 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.WWW-Authenticate.Digest.md5	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.WWW-Authenticate.NTLM	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.WWW-Authenticate.Negotiate 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.Warning 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.X-DNS-Prefetch-Control	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.headers.X-Frame-Options 📋	Chrome	1/25/2010	Chrome Android	6/27/2012	884
http.headers.X-Frame-Options.SAMEORIGIN	Chrome	1/25/2010	Chrome Android	6/27/2012	884	Chrome: Starting in Chrome 61, this applies to all of a frame's ancestors.Chrome Android: Starting in Chrome Android 61, this applies to all of a frame's ancestors.Firefox: Starting in Firefox 59, this applies to all of a frame's ancestors.Firefox for Android: Starting in Firefox for Android 59, this applies to all of a frame's ancestors.Quest Browser: Starting in Quest Browser 5.0, this applies to all of a frame's ancestors.Opera: Starting in Opera 48, this applies to all of a frame's ancestors.Opera Android: Starting in Opera Android 45, this applies to all of a frame's ancestors.Samsung Internet: Starting in Samsung Internet 8.0, this applies to all of a frame's ancestors.WebView Android: Starting in WebView Android 61, this applies to all of a frame's ancestors.
http.methods.CONNECT 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.methods.DELETE 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.methods.GET 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.methods.HEAD 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.methods.OPTIONS 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.methods.POST 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294
http.methods.PUT 📋	Chrome	12/11/2008	Chrome Android	6/27/2012	1294