For a given set of browsers, what APIs are not yet in all of them.
| Not in Safari on iOS | Not in Firefox | |
|---|---|---|
| In Safari on iOS | 63 | |
| In Firefox | 68 |
Below is a list of features that are not in all of Safari on iOS and Firefox
| API | First Browser | Date | Days in Limbo | Notes |
|---|---|---|---|---|
| html.elements.a.attributionsourceid 📋 | Safari on iOS | 4/26/2021 | 1996 | |
| html.elements.a.coords 📋 | Safari on iOS | 6/29/2007 | 7046 | 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 | 5285 | |
| html.elements.a.shape 📋 | Safari on iOS | 6/29/2007 | 7046 | 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.audio.disableremoteplayback 📋 | Safari on iOS | 9/19/2019 | 2581 | |
| html.elements.canvas.moz-opaque | Firefox | 6/30/2009 | 6314 | |
| html.elements.col.char 📋 | Safari on iOS | 7/11/2008 | 6668 | |
| html.elements.col.charoff 📋 | Safari on iOS | 7/11/2008 | 6668 | |
| html.elements.colgroup.char 📋 | Safari on iOS | 7/11/2008 | 6668 | |
| html.elements.colgroup.charoff 📋 | Safari on iOS | 7/11/2008 | 6668 | |
| html.elements.form.autocomplete.new-password | Firefox | 5/21/2019 | 2702 | |
| html.elements.iframe.allow.autoplay 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.display-capture 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.document-domain 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.encrypted-media 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.fullscreen 📋 | Firefox | 8/25/2020 | 2240 | |
| html.elements.iframe.allow.gamepad 📋 | Firefox | 8/10/2021 | 1890 | 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.geolocation 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.midi 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.payment 📋 | Firefox | 3/10/2020 | 2408 | |
| html.elements.iframe.allow.publickey-credentials-create 📋 | Firefox | 2/20/2024 | 966 | |
| html.elements.iframe.allow.publickey-credentials-get 📋 | Firefox | 9/26/2023 | 1113 | |
| html.elements.iframe.allow.speaker-selection 📋 | Firefox | 8/1/2023 | 1169 | Firefox for Android: Not available due to a limitation in Android (see bug 1473346). |
| html.elements.iframe.allow.web-share 📋 | Firefox | 9/22/2020 | 2212 | Firefox: Firefox recognizes the web-share permissions policy, but this has no effect in versions of Firefox that do not support the share() method.Firefox for Android: Firefox for Android recognizes the web-share permissions policy, but this has no effect in versions of Firefox for Android that do not support the share() method. |
| html.elements.iframe.sandbox.allow-orientation-lock 📋 | Firefox | 9/20/2016 | 3675 | |
| html.elements.iframe.sandbox.allow-pointer-lock 📋 | Firefox | 9/20/2016 | 3675 | |
| html.elements.iframe.sandbox.allow-presentation 📋 | Firefox | 11/15/2016 | 3619 | |
| html.elements.input.capture 📋 | Safari on iOS | 9/13/2016 | 3682 | |
| html.elements.input.type_month 📋 | Safari on iOS | 3/29/2018 | 3120 | 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 | 3507 | |
| html.elements.input.type_week 📋 | Safari on iOS | 12/11/2024 | 671 | |
| html.elements.input.webkitdirectory | Firefox | 11/15/2016 | 3619 | Chrome Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).Chrome Android: Before version 131, users cannot choose a directory, only individual files (see bug 40248532.Opera Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).Opera Android: Before version 87, users cannot choose a directory, only individual files (see bug 40248532.Safari on iOS: The attribute can be set but users cannot choose a directory, only individual files (see bug 271705).WebView Android: In Chrome for Android 131, choosing a directory crashes the browser (see bug 376834374).WebView Android: Before version 131, users cannot choose a directory, only individual files (see bug 40248532.WebView on iOS: The attribute can be set but users cannot choose a directory, only individual files (see bug 271705). |
| html.elements.link.blocking 📋 | Safari on iOS | 12/11/2024 | 671 | |
| html.elements.link.rel.alternate_stylesheet 📋 | Firefox | 6/17/2008 | 6692 | |
| html.elements.link.rel.icon | Firefox | 10/24/2006 | 7294 | Chrome: If both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.).Edge: In version 79 and later (Blink-based Edge), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Firefox: Before Firefox 83, the crossorigin attribute is not supported for rel="icon".Firefox: The media attribute is not supported for rel="icon", see bug 1603885.Opera: In version 15 and later (Blink-based Opera), if both ICO and PNG are available, will use ICO over PNG if ICO has better matching sizes set. (Per caniuse.com.)Safari: If both ICO and PNG are available, will ALWAYS use ICO file, regardless of sizes set. (Per caniuse.com.)Safari on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.)WebView on iOS: Does not use favicons at all (but may have alternative for bookmarks, etc.). (Per caniuse.com.) |
| html.elements.link.rel.manifest 📋 | Safari on iOS | 3/29/2018 | 3120 | |
| html.elements.link.rel.preload.as-track | Safari on iOS | 3/29/2018 | 3120 | |
| html.elements.meta.name.theme-color 📋 | Safari on iOS | 9/20/2021 | 1849 | 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.blocking 📋 | Safari on iOS | 12/11/2024 | 671 | |
| html.elements.script.type.importmap.integrity 📋 | Safari on iOS | 9/16/2024 | 757 | |
| html.elements.select.size 📋 | Firefox | 11/9/2004 | 8008 | |
| html.elements.style.blocking 📋 | Safari on iOS | 12/11/2024 | 671 | |
| html.elements.summary.display_list_item | Firefox | 9/20/2016 | 3675 | |
| html.elements.tbody.char | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.td.char | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.td.rowspan.rowspan_zero | Firefox | 8/8/2017 | 3353 | |
| html.elements.template.shadowrootclonable 📋 | Firefox | 4/16/2024 | 910 | |
| html.elements.template.shadowrootdelegatesfocus 📋 | Firefox | 2/20/2024 | 966 | |
| html.elements.textarea.autocomplete.new-password | Firefox | 5/21/2019 | 2702 | |
| html.elements.tfoot.char | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.th.char | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.th.rowspan.rowspan_zero | Firefox | 8/8/2017 | 3353 | |
| html.elements.thead.char | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.tr.char | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.tr.charoff | Safari on iOS | 4/3/2010 | 6037 | |
| html.elements.video.disableremoteplayback 📋 | Safari on iOS | 9/19/2019 | 2581 | |
| html.elements.video.playsinline 📋 | Safari on iOS | 9/13/2016 | 3682 | |
| html.global_attributes.autocorrect 📋 | Safari on iOS | 4/26/2021 | 1996 | Safari: Takes values of true/false (instead of on/off).Safari: Allowed on <input type='password'> elements.Safari on iOS: Takes values of true/false (instead of on/off).Safari on iOS: Allowed on <input type='password'> elements. |
| html.global_attributes.contenteditable.plaintext-only | Safari on iOS | 3/24/2020 | 2394 | |
| html.global_attributes.is 📋 | Firefox | 10/23/2018 | 2912 | |
| html.global_attributes.writingsuggestions 📋 | Safari on iOS | 9/16/2024 | 757 | |
| html.manifest.display 📋 | Safari on iOS | 3/29/2018 | 3120 | 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 📋 | Safari on iOS | 3/29/2018 | 3120 | |
| html.manifest.display.standalone 📋 | Safari on iOS | 3/29/2018 | 3120 | |
| html.manifest.icons 📋 | Safari on iOS | 3/14/2022 | 1674 | 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 📋 | Safari on iOS | 3/27/2023 | 1296 | Firefox: The property parses, but has no effect. |
| html.manifest.name 📋 | Safari on iOS | 3/29/2018 | 3120 | 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.scope 📋 | Safari on iOS | 3/29/2018 | 3120 | |
| html.manifest.short_name 📋 | Safari on iOS | 3/29/2018 | 3120 | 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.start_url 📋 | Safari on iOS | 3/29/2018 | 3120 | 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 📋 | Safari on iOS | 9/20/2021 | 1849 |
| API | First Browser | Date | Days in Limbo | Notes |
|---|---|---|---|---|
| javascript.builtins.Atomics.Atomic_operations_on_non_shared_buffers | Firefox | 7/28/2020 | 2268 | |
| javascript.builtins.Atomics.waitAsync 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Error.Error.fileName_parameter | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.Error.Error.lineNumber_parameter | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.Error.cause.displayed_in_console | Firefox | 8/10/2021 | 1890 | |
| javascript.builtins.Error.columnNumber | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.Error.fileName | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.Error.lineNumber | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.Error.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serialized properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 adds serialization of stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 adds serialization of stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serialized properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 adds serialization of stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 adds serialization of stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.EvalError.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.FinalizationRegistry.symbol_as_target | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Function.displayName | Firefox | 6/5/2012 | 5243 | |
| javascript.builtins.InternalError | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.InternalError.InternalError | Firefox | 11/9/2004 | 8008 | |
| javascript.builtins.Intl.DurationFormat 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Intl.DurationFormat.DurationFormat 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Intl.DurationFormat.format 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Intl.DurationFormat.formatToParts 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Intl.DurationFormat.resolvedOptions 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Intl.DurationFormat.supportedLocalesOf 📋 | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.Intl.Locale.getCalendars 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.Locale.getCollations 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.Locale.getHourCycles 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.Locale.getNumberingSystems 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.Locale.getTextInfo 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Deno: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.Locale.getTimeZones 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.Locale.getWeekInfo 📋 | Safari on iOS | 9/18/2023 | 1121 | Chrome: Implemented as an accessor property.Chrome Android: Implemented as an accessor property.Edge: Implemented as an accessor property.Node.js: Implemented as an accessor property.Quest Browser: Implemented as an accessor property.Opera: Implemented as an accessor property.Opera Android: Implemented as an accessor property.Safari: Implemented as an accessor property.Safari on iOS: Implemented as an accessor property.Samsung Internet: Implemented as an accessor property.WebView Android: Implemented as an accessor property.WebView on iOS: Implemented as an accessor property. |
| javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_trailingZeroDisplay_parameter | Firefox | 8/1/2023 | 1169 | |
| javascript.builtins.Iterator.Iterator 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.drop 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.every 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.filter 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.find 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.flatMap 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.forEach 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.from 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.map 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.reduce 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.some 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.take 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.Iterator.toArray 📋 | Firefox | 10/1/2024 | 742 | |
| javascript.builtins.JSON.isRawJSON 📋 | Firefox | 2/4/2025 | 616 | |
| javascript.builtins.JSON.parse.reviver_parameter_context_argument 📋 | Firefox | 2/4/2025 | 616 | |
| javascript.builtins.JSON.rawJSON 📋 | Firefox | 2/4/2025 | 616 | |
| javascript.builtins.Promise.incumbent_settings_object_tracking 📋 | Firefox | 11/15/2016 | 3619 | |
| javascript.builtins.RangeError.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.ReferenceError.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.SyntaxError.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.TypeError.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.URIError.serializable_object 📋 | Firefox | 7/26/2022 | 1540 | Firefox: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()).Firefox for Android: Version 103 serializable properties: name, message, cause, fileName, lineNumber and columnNumber.Firefox for Android: Version 104 also serializes stack in the main thread (window.postMessage() and structuredClone()).Firefox for Android: Version 110 also serializes stack in workers (worker.postMessage() and structuredClone()). |
| javascript.builtins.WeakMap.symbol_as_keys | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.WeakRef.symbol_as_target | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.builtins.WeakSet.symbol_as_keys | Safari on iOS | 3/27/2023 | 1296 | |
| javascript.grammar.trailing_commas.trailing_commas_in_dynamic_import | Safari on iOS | 9/20/2021 | 1849 | Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules. |
| javascript.operators.import.options_parameter | Safari on iOS | 9/20/2021 | 1849 | Node.js: The second parameter no longer throws a parser error, but the --experimental-json-modules flag is still needed to load JSON modules. |
| javascript.regular_expressions.modifier 📋 | Firefox | 10/29/2024 | 714 | |
| javascript.statements.import.import_attributes 📋 | Safari on iOS | 12/11/2023 | 1037 | |
| javascript.statements.import.import_attributes.type_json | Safari on iOS | 12/11/2023 | 1037 | |
| javascript.statements.import.service_worker_support | Safari on iOS | 9/20/2021 | 1849 | |
| javascript.statements.import.worklet_support | Firefox | 6/6/2023 | 1225 |