For a given set of browsers, what APIs are not yet in all of them.
| Not in Chrome | Not in Firefox | |
|---|---|---|
| In Chrome | 136 | |
| In Firefox | 11 |
Below is a list of features that are not in all of Chrome and Firefox
| API | First Browser | Date | Days in Limbo | Notes |
|---|---|---|---|---|
| html.elements.a.attributionsrc 📋 | Chrome | 5/14/2024 | 810 | |
| html.elements.a.coords 📋 | Chrome | 12/11/2008 | 6443 | Firefox: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed.Firefox for Android: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed. |
| html.elements.a.href.href_sms | Firefox | 4/24/2012 | 5213 | |
| html.elements.a.hreftranslate | Chrome | 4/7/2020 | 2308 | |
| html.elements.a.referrerpolicy.no-referrer-when-downgrade | Chrome | 5/25/2016 | 3721 | |
| html.elements.a.referrerpolicy.origin-when-cross-origin | Chrome | 5/25/2016 | 3721 | |
| html.elements.a.referrerpolicy.unsafe-url | Chrome | 5/25/2016 | 3721 | |
| html.elements.a.shape 📋 | Chrome | 12/11/2008 | 6443 | Firefox: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed.Firefox for Android: You can no longer nest an <a> element inside a <map> element to create a hotspot region - coords and shape attribute support removed. |
| html.elements.a.target.unfencedTop | Chrome | 7/18/2023 | 1111 | |
| html.elements.area.referrerpolicy.no-referrer-when-downgrade | Chrome | 5/25/2016 | 3721 | |
| html.elements.area.referrerpolicy.origin-when-cross-origin | Chrome | 5/25/2016 | 3721 | |
| html.elements.area.referrerpolicy.unsafe-url | Chrome | 5/25/2016 | 3721 | |
| html.elements.audio.controlslist 📋 | Chrome | 4/19/2017 | 3392 | |
| html.elements.audio.disableremoteplayback 📋 | Chrome | 1/23/2024 | 922 | |
| html.elements.canvas.moz-opaque | Firefox | 6/30/2009 | 6242 | |
| html.elements.col.char 📋 | Chrome | 12/11/2008 | 6443 | |
| html.elements.col.charoff 📋 | Chrome | 12/11/2008 | 6443 | |
| html.elements.colgroup.char 📋 | Chrome | 12/11/2008 | 6443 | |
| html.elements.colgroup.charoff 📋 | Chrome | 12/11/2008 | 6443 | |
| html.elements.fencedframe 📋 | Chrome | 7/18/2023 | 1111 | |
| html.elements.fencedframe.allow 📋 | Chrome | 7/18/2023 | 1111 | |
| html.elements.fencedframe.height 📋 | Chrome | 7/18/2023 | 1111 | |
| html.elements.fencedframe.width 📋 | Chrome | 7/18/2023 | 1111 | |
| html.elements.form.autocomplete.new-password | Firefox | 5/21/2019 | 2630 | |
| html.elements.form.autocomplete.webauthn 📋 | Chrome | 11/29/2022 | 1342 | |
| html.elements.iframe.allow.accelerometer 📋 | Chrome | 4/17/2018 | 3029 | |
| html.elements.iframe.allow.ambient-light-sensor 📋 | Chrome | 4/17/2018 | 3029 | |
| html.elements.iframe.allow.attribution-reporting 📋 | Chrome | 9/12/2023 | 1055 | |
| html.elements.iframe.allow.bluetooth 📋 | Chrome | 8/2/2022 | 1461 | |
| html.elements.iframe.allow.browsing-topics | Chrome | 7/18/2023 | 1111 | |
| html.elements.iframe.allow.compute-pressure 📋 | Chrome | 5/14/2024 | 810 | |
| html.elements.iframe.allow.cross-origin-isolated 📋 | Chrome | 11/17/2020 | 2084 | |
| html.elements.iframe.allow.gamepad 📋 | Firefox | 8/10/2021 | 1818 | Firefox: The default allowlist is * instead of self (as required by the specification).Firefox for Android: The default allowlist is * instead of self (as required by the specification). |
| html.elements.iframe.allow.gyroscope 📋 | Chrome | 4/17/2018 | 3029 | |
| html.elements.iframe.allow.hid 📋 | Chrome | 3/2/2021 | 1979 | |
| html.elements.iframe.allow.identity-credentials-get 📋 | Chrome | 2/7/2023 | 1272 | |
| html.elements.iframe.allow.idle-detection 📋 | Chrome | 9/21/2021 | 1776 | |
| html.elements.iframe.allow.local-fonts 📋 | Chrome | 6/21/2022 | 1503 | |
| html.elements.iframe.allow.magnetometer 📋 | Chrome | 4/17/2018 | 3029 | |
| html.elements.iframe.allow.otp-credentials 📋 | Chrome | 8/31/2021 | 1797 | |
| html.elements.iframe.allow.picture-in-picture 📋 | Chrome | 12/4/2018 | 2798 | |
| html.elements.iframe.allow.publickey-credentials-create 📋 | Firefox | 2/20/2024 | 894 | |
| html.elements.iframe.allow.serial 📋 | Chrome | 3/2/2021 | 1979 | |
| html.elements.iframe.allow.speaker-selection 📋 | Firefox | 8/1/2023 | 1097 | Firefox for Android: Not available due to a limitation in Android (see bug 1473346). |
| html.elements.iframe.allow.storage-access 📋 | Chrome | 5/2/2023 | 1188 | |
| html.elements.iframe.allow.usb 📋 | Chrome | 7/25/2017 | 3295 | |
| html.elements.iframe.allow.wildcards | Chrome | 11/29/2022 | 1342 | |
| html.elements.iframe.allow.window-management 📋 | Chrome | 3/29/2022 | 1587 | |
| html.elements.iframe.allow.xr-spatial-tracking 📋 | Chrome | 12/10/2019 | 2427 | |
| html.elements.iframe.allowpaymentrequest | Chrome | 7/25/2017 | 3295 | |
| html.elements.iframe.browsingtopics | Chrome | 7/18/2023 | 1111 | |
| html.elements.iframe.credentialless 📋 | Chrome | 2/7/2023 | 1272 | |
| html.elements.iframe.csp 📋 | Chrome | 9/5/2017 | 3253 | |
| html.elements.iframe.referrerpolicy.no-referrer-when-downgrade | Chrome | 5/25/2016 | 3721 | |
| html.elements.iframe.referrerpolicy.origin-when-cross-origin | Chrome | 5/25/2016 | 3721 | |
| html.elements.iframe.referrerpolicy.unsafe-url | Chrome | 5/25/2016 | 3721 | |
| html.elements.iframe.sandbox.allow-top-navigation-to-custom-protocols 📋 | Firefox | 5/31/2022 | 1524 | |
| html.elements.img.attributionsrc 📋 | Chrome | 5/14/2024 | 810 | |
| html.elements.img.referrerpolicy.no-referrer-when-downgrade | Chrome | 5/25/2016 | 3721 | |
| html.elements.img.referrerpolicy.origin-when-cross-origin | Chrome | 5/25/2016 | 3721 | |
| html.elements.img.referrerpolicy.unsafe-url | Chrome | 5/25/2016 | 3721 | |
| html.elements.img.sizes.auto 📋 | Chrome | 6/11/2024 | 782 | |
| html.elements.input.type_month 📋 | Chrome | 6/26/2012 | 5150 | Safari: The input type is recognized, but there is no month-specific control. See bug 200416. |
| html.elements.input.type_password.insecure_login_handling | Firefox | 3/7/2017 | 3435 | |
| html.elements.input.type_week 📋 | Chrome | 6/26/2012 | 5150 | |
| html.elements.link.blocking 📋 | Chrome | 9/2/2022 | 1430 | |
| html.elements.link.referrerpolicy.no-referrer-when-downgrade | Chrome | 5/25/2016 | 3721 | |
| html.elements.link.referrerpolicy.origin-when-cross-origin | Chrome | 5/25/2016 | 3721 | |
| html.elements.link.referrerpolicy.unsafe-url | Chrome | 5/25/2016 | 3721 | |
| html.elements.link.rel.alternate_stylesheet 📋 | Firefox | 6/17/2008 | 6620 | |
| html.elements.link.rel.expect 📋 | Chrome | 4/16/2024 | 838 | |
| html.elements.link.rel.manifest 📋 | Chrome | 11/18/2014 | 4275 | |
| html.elements.link.rel.preload.as-track | Chrome | 4/13/2016 | 3763 | |
| html.elements.link.rel.prerender | Chrome | 8/2/2011 | 5479 | |
| html.elements.meta.name.application-title | Chrome | 3/4/2025 | 516 | |
| html.elements.meta.name.theme-color 📋 | Chrome | 3/12/2019 | 2700 | Chrome: Chrome uses the color only on installed progressive web apps.Chrome: Chrome reports support, but does not actually use the color anywhere.Chrome Android: Chrome for Android does not use the color on devices with native dark mode enabled unless it's an installed progressive web app or a trusted web activity.Edge: Edge uses the color only on installed progressive web apps.Quest Browser: Chrome for Android does not use the color on devices with native dark mode enabled unless it's an installed progressive web app or a trusted web activity. |
| html.elements.script.attributionsrc 📋 | Chrome | 5/14/2024 | 810 | |
| html.elements.script.blocking 📋 | Chrome | 9/2/2022 | 1430 | |
| html.elements.script.referrerpolicy.no-referrer-when-downgrade | Chrome | 10/16/2018 | 2847 | |
| html.elements.script.referrerpolicy.origin-when-cross-origin | Chrome | 10/16/2018 | 2847 | |
| html.elements.script.referrerpolicy.unsafe-url | Chrome | 10/16/2018 | 2847 | |
| html.elements.script.type.importmap.integrity 📋 | Chrome | 7/23/2024 | 740 | |
| html.elements.script.type.importmap.multiple_import_maps 📋 | Chrome | 2/4/2025 | 544 | |
| html.elements.script.type.speculationrules 📋 | Chrome | 1/10/2023 | 1300 | Chrome: Initial support included same-origin prerendering only.Chrome Android: Initial support included same-origin prerendering only.Edge: Initial support included same-origin prerendering only.Quest Browser: Initial support included same-origin prerendering only.Opera: Initial support included same-origin prerendering only.Opera Android: Initial support included same-origin prerendering only.Samsung Internet: Initial support included same-origin prerendering only. |
| html.elements.script.type.speculationrules.eagerness | Chrome | 1/23/2024 | 922 | |
| html.elements.script.type.speculationrules.expects_no_vary_search | Chrome | 7/23/2024 | 740 | Chrome: Supported for prefetch only.Chrome Android: Supported for prefetch only.Edge: Supported for prefetch only.Opera: Supported for prefetch only.Opera Android: Supported for prefetch only.Samsung Internet: Supported for prefetch only. |
| html.elements.script.type.speculationrules.prefetch | Chrome | 2/7/2023 | 1272 | |
| html.elements.script.type.speculationrules.prerender | Chrome | 9/2/2022 | 1430 | |
| html.elements.script.type.speculationrules.referrer_policy | Chrome | 3/7/2023 | 1244 | |
| html.elements.script.type.speculationrules.relative_to | Chrome | 1/23/2024 | 922 | |
| html.elements.script.type.speculationrules.requires | Chrome | 2/7/2023 | 1272 | |
| html.elements.script.type.speculationrules.requires.anonymous-client-ip-when-cross-origin | Chrome | 2/7/2023 | 1272 | |
| html.elements.script.type.speculationrules.source_optional | Chrome | 2/20/2024 | 894 | |
| html.elements.script.type.speculationrules.urls | Chrome | 1/10/2023 | 1300 | |
| html.elements.script.type.speculationrules.where | Chrome | 1/23/2024 | 922 | |
| html.elements.style.blocking 📋 | Chrome | 9/2/2022 | 1430 | |
| html.elements.tbody.char | Chrome | 12/11/2008 | 6443 | |
| html.elements.td.char | Chrome | 12/11/2008 | 6443 | |
| html.elements.template.shadowrootserializable 📋 | Chrome | 5/14/2024 | 810 | |
| html.elements.textarea.autocomplete.new-password | Firefox | 5/21/2019 | 2630 | |
| html.elements.textarea.autocomplete.webauthn 📋 | Chrome | 11/29/2022 | 1342 | |
| html.elements.textarea.wrap.hard | Chrome | 12/13/2011 | 5346 | |
| html.elements.tfoot.char | Chrome | 12/11/2008 | 6443 | |
| html.elements.th.char | Chrome | 12/11/2008 | 6443 | |
| html.elements.th.rowspan.rowspan_zero | Firefox | 8/8/2017 | 3281 | |
| html.elements.thead.char | Chrome | 12/11/2008 | 6443 | |
| html.elements.tr.char | Chrome | 12/11/2008 | 6443 | |
| html.elements.tr.charoff | Chrome | 12/11/2008 | 6443 | |
| html.elements.video.controlslist 📋 | Chrome | 4/19/2017 | 3392 | |
| html.elements.video.disableremoteplayback 📋 | Chrome | 1/23/2024 | 922 | |
| html.elements.video.playsinline 📋 | Chrome | 6/4/2019 | 2616 | |
| html.global_attributes.contenteditable.plaintext-only | Chrome | 5/25/2016 | 3721 | |
| html.global_attributes.hidden.until-found 📋 | Chrome | 5/24/2022 | 1531 | |
| html.global_attributes.virtualkeyboardpolicy 📋 | Chrome | 9/21/2021 | 1776 | |
| html.global_attributes.writingsuggestions 📋 | Chrome | 4/16/2024 | 838 | |
| html.manifest.background_color 📋 | Chrome | 10/13/2015 | 3946 | |
| html.manifest.description 📋 | Chrome | 1/19/2021 | 2021 | Firefox for Android: The property parses, but has no effect. |
| html.manifest.display 📋 | Chrome | 11/18/2014 | 4275 | Chrome: display and/or display_override are required for a web app to be installable.Chrome Android: display and/or display_override are required for a web app to be installable.Edge: display and/or display_override are required for a web app to be installable.Quest Browser: display and/or display_override are required for a web app to be installable.Opera: display and/or display_override are required for a web app to be installable.Opera Android: display and/or display_override are required for a web app to be installable.Samsung Internet: display and/or display_override are required for a web app to be installable.WebView Android: display and/or display_override are required for a web app to be installable. |
| html.manifest.display.browser 📋 | Chrome | 11/18/2014 | 4275 | |
| html.manifest.display.fullscreen 📋 | Chrome | 11/18/2014 | 4275 | |
| html.manifest.display.minimal-ui 📋 | Chrome | 11/18/2014 | 4275 | |
| html.manifest.display.standalone 📋 | Chrome | 11/18/2014 | 4275 | |
| html.manifest.display_override 📋 | Chrome | 3/2/2021 | 1979 | Chrome: display_override and/or display are required for a web app to be installable.Chrome Android: display_override and/or display are required for a web app to be installable.Edge: display_override and/or display are required for a web app to be installable.Quest Browser: display_override and/or display are required for a web app to be installable.Opera: display_override and/or display are required for a web app to be installable.Opera Android: display_override and/or display are required for a web app to be installable.Samsung Internet: display_override and/or display are required for a web app to be installable. |
| html.manifest.display_override.tabbed 📋 | Chrome | 6/11/2024 | 782 | |
| html.manifest.display_override.window-controls-overlay 📋 | Chrome | 9/2/2022 | 1430 | |
| html.manifest.file_handlers 📋 | Chrome | 5/24/2022 | 1531 | |
| html.manifest.icons 📋 | Chrome | 11/18/2014 | 4275 | Chrome: icons is required for a web app to be installable.Chrome Android: icons is required for a web app to be installable.Edge: icons is required for a web app to be installable.Quest Browser: icons is required for a web app to be installable.Opera: icons is required for a web app to be installable.Opera Android: icons is required for a web app to be installable.Safari: Only used when no apple-touch-icon is present and either "purpose" is set to "any" or "purpose" is not specified.Safari on iOS: Only used when no apple-touch-icon is present and either "purpose" is set to "any" or "purpose" is not specified.Samsung Internet: icons is required for a web app to be installable.WebView Android: icons is required for a web app to be installable.WebView on iOS: Only used when no apple-touch-icon is present and either "purpose" is set to "any" or "purpose" is not specified. |
| html.manifest.id 📋 | Chrome | 11/15/2021 | 1721 | Firefox: The property parses, but has no effect. |
| html.manifest.launch_handler 📋 | Chrome | 2/7/2023 | 1272 | |
| html.manifest.launch_handler.client_mode 📋 | Chrome | 2/7/2023 | 1272 | |
| html.manifest.name 📋 | Chrome | 11/18/2014 | 4275 | Chrome: name or short_name is required for a web app to be installable.Chrome Android: name or short_name is required for a web app to be installable.Edge: name or short_name is required for a web app to be installable.Quest Browser: name or short_name is required for a web app to be installable.Opera: name or short_name is required for a web app to be installable.Opera Android: name or short_name is required for a web app to be installable.Samsung Internet: name or short_name is required for a web app to be installable.WebView Android: name or short_name is required for a web app to be installable. |
| html.manifest.note_taking 📋 | Chrome | 10/19/2021 | 1748 | |
| html.manifest.note_taking.new_note_url 📋 | Chrome | 10/19/2021 | 1748 | |
| html.manifest.orientation 📋 | Chrome | 11/18/2014 | 4275 | |
| html.manifest.protocol_handlers 📋 | Chrome | 11/15/2021 | 1721 | |
| html.manifest.protocol_handlers.protocol 📋 | Chrome | 11/15/2021 | 1721 | |
| html.manifest.protocol_handlers.url 📋 | Chrome | 11/15/2021 | 1721 | |
| html.manifest.scope 📋 | Chrome | 8/31/2016 | 3623 | |
| html.manifest.serviceworker | Chrome | 10/16/2018 | 2847 | |
| html.manifest.serviceworker.scope | Chrome | 10/16/2018 | 2847 | |
| html.manifest.serviceworker.src | Chrome | 10/16/2018 | 2847 | |
| html.manifest.serviceworker.use_cache | Chrome | 10/16/2018 | 2847 | |
| html.manifest.share_target 📋 | Chrome | 3/2/2021 | 1979 | Firefox for Android: The property parses, but has no effect. |
| html.manifest.short_name 📋 | Chrome | 11/18/2014 | 4275 | Chrome: short_name or name is required for a web app to be installable.Chrome Android: short_name or name is required for a web app to be installable.Edge: short_name or name is required for a web app to be installable.Quest Browser: short_name or name is required for a web app to be installable.Opera: short_name or name is required for a web app to be installable.Opera Android: short_name or name is required for a web app to be installable.Samsung Internet: short_name or name is required for a web app to be installable.WebView Android: short_name or name is required for a web app to be installable. |
| html.manifest.shortcuts 📋 | Chrome | 11/15/2021 | 1721 | Chrome: Supported on Windows only.Edge: Supported on Windows only.Opera: Supported on Windows only. |
| html.manifest.start_url 📋 | Chrome | 11/18/2014 | 4275 | Chrome: start_url is required for a web app to be installable.Chrome Android: start_url is required for a web app to be installable.Edge: start_url is required for a web app to be installable.Quest Browser: start_url is required for a web app to be installable.Opera: start_url is required for a web app to be installable.Opera Android: start_url is required for a web app to be installable.Samsung Internet: start_url is required for a web app to be installable.WebView Android: start_url is required for a web app to be installable. |
| html.manifest.theme_color 📋 | Chrome | 10/13/2015 | 3946 |