For a given set of browsers, what APIs are not yet in all of them.
| Not in Chrome | Not in Firefox | |
|---|---|---|
| In Chrome | 9 | |
| In Firefox | 25 |
Below is a list of features that are not in all of Chrome and Firefox
| API | First Browser | Date | Days in Limbo | Notes |
|---|---|---|---|---|
| javascript.builtins.Atomics.Atomic_operations_on_non_shared_buffers | Firefox | 7/28/2020 | 2060 | |
| javascript.builtins.Error.Error.fileName_parameter | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.Error.Error.lineNumber_parameter | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.Error.columnNumber | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.Error.fileName | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.Error.lineNumber | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.Error.stackTraceLimit | Chrome | 9/15/2009 | 6029 | |
| javascript.builtins.FinalizationRegistry.unregister.symbol_as_target | Chrome | 1/10/2023 | 1164 | |
| javascript.builtins.Function.displayName | Firefox | 6/5/2012 | 5035 | |
| javascript.builtins.InternalError | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.InternalError.InternalError | Firefox | 11/9/2004 | 7800 | |
| javascript.builtins.Intl.Locale.getCalendars 📋 | Chrome | 10/15/2024 | 520 | 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 📋 | Chrome | 10/15/2024 | 520 | 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 📋 | Chrome | 10/15/2024 | 520 | 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 📋 | Chrome | 10/15/2024 | 520 | 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 📋 | Chrome | 10/15/2024 | 520 | 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 📋 | Chrome | 10/15/2024 | 520 | 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 📋 | Chrome | 10/15/2024 | 520 | 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.variants 📋 | Firefox | 7/22/2025 | 240 | |
| javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_roundingIncrement_parameter | Firefox | 8/1/2023 | 961 | |
| javascript.builtins.Intl.PluralRules.PluralRules.options_parameter.options_trailingZeroDisplay_parameter | Firefox | 8/1/2023 | 961 | |
| javascript.builtins.Intl.supportedValuesOf.key_parameter_timeZone.includes_UTC | Firefox | 10/5/2021 | 1626 | |
| javascript.builtins.Iterator.zip 📋 | Firefox | 2/24/2026 | 23 | |
| javascript.builtins.Iterator.zipKeyed 📋 | Firefox | 2/24/2026 | 23 | |
| javascript.builtins.Math.sumPrecise 📋 | Firefox | 4/1/2025 | 352 | |
| javascript.builtins.Promise.incumbent_settings_object_tracking 📋 | Firefox | 11/15/2016 | 3411 | |
| javascript.builtins.RegExp.compile.rexexp_legacy_features | Firefox | 2/24/2026 | 23 | |
| javascript.builtins.Temporal.Instant.Instant 📋 | Firefox | 5/27/2025 | 296 | |
| javascript.builtins.Temporal.PlainDate.PlainDate 📋 | Firefox | 5/27/2025 | 296 | |
| javascript.builtins.Temporal.PlainDateTime.PlainDateTime 📋 | Firefox | 5/27/2025 | 296 | |
| javascript.builtins.Temporal.PlainMonthDay.PlainMonthDay 📋 | Firefox | 5/27/2025 | 296 | |
| javascript.builtins.Temporal.PlainYearMonth.PlainYearMonth 📋 | Firefox | 5/27/2025 | 296 | |
| javascript.builtins.Temporal.ZonedDateTime.ZonedDateTime 📋 | Firefox | 5/27/2025 | 296 | |
| javascript.statements.import.worklet_support | Firefox | 6/6/2023 | 1017 |