| Explicit Resource Management |
Ron Buckton |
Ron Buckton |
-2026‑05
-2026‑03
-2025‑05
-2025‑04
-2025‑02
-2024‑06
-2024‑06
-2024‑04
-2023‑07
-2023‑07
-2023‑03
-2023‑03
-2023‑03
-2023‑01
-2023‑01
-2023‑01
-2022‑12
-2022‑09
-2021‑10
-2020‑02
-2019‑07
-2019‑07
-2018‑07 |
2027 |
Atomics.pause |
Shu-yu Guo |
Shu-yu Guo |
-2026‑05
-2026‑01
-2024‑10
-2024‑07
-2024‑06 |
2027 |
| Joint Iteration |
Michael Ficarra |
Michael Ficarra |
-2026‑05
-2025‑11
-2024‑07
-2024‑06
-2024‑04
-2024‑02
-2023‑11
-2023‑09 |
2027 |
| Temporal |
Philipp Dunkel
Maggie Johnson-Pint
Matt Johnson-Pint
Brian Terlson
Shane Carr
Ujjwal Sharma
Philip Chimento
Jason Williams
Justin Grant |
Philipp Dunkel
Maggie Johnson-Pint
Matt Johnson-Pint
Brian Terlson
Shane Carr
Ujjwal Sharma
Philip Chimento
Jason Williams
Justin Grant |
-2026‑05
-2026‑03
-2026‑01
-2025‑11
-2025‑09
-2025‑07
-2025‑05
-2025‑04
-2024‑10
-2024‑07
-2024‑06
-2024‑04
-2024‑02
-2023‑11
-2023‑07
-2023‑05
-2023‑03
-2023‑03
-2023‑01
-2023‑01
-2023‑01
-2022‑11
-2022‑09
-2022‑09
-2022‑07
-2022‑06
-2022‑03
-2021‑12
-2021‑10
-2021‑10
-2021‑08
-2021‑05
-2021‑04
-2021‑03
-2021‑03
-2021‑01
-2020‑11
-2020‑09
-2020‑07
-2020‑06
-2020‑03
-2020‑02
-2019‑10
-2019‑03
-2018‑09
-2018‑07
-2017‑07 |
2027 |
Upsert |
Daniel Minor
Lauritz Thoresen Angeltveit
Jonas Haukenes
Sune Lianes
Vetle Larsen
Mathias Hop Ness |
Daniel Minor |
-2026‑01
-2025‑07
-2025‑04
-2024‑12
-2024‑10
-2020‑07
-2019‑10 |
2026 |
| JSON.parse source text access |
Richard Gibson |
Richard Gibson |
-2025‑11
-2024‑06
-2023‑09
-2023‑01
-2022‑06
-2021‑10
-2020‑07
-2020‑02
-2018‑09 |
2026 |
| Iterator Sequencing |
Michael Ficarra |
Michael Ficarra |
-2025‑11
-2025‑07
-2025‑05
-2024‑12
-2024‑10
-2024‑06
-2024‑02
-2023‑11
-2023‑09 |
2026 |
| Uint8Array to/from Base64 |
Kevin Gibbons |
Kevin Gibbons |
-2025‑07
-2024‑06
-2024‑02
-2023‑11
-2023‑09
-2023‑07
-2023‑05
-2021‑07 |
2026 |
Math.sumPrecise |
Kevin Gibbons |
Kevin Gibbons |
-2025‑07
-2024‑10
-2024‑04
-2024‑02
-2023‑11 |
2026 |
Error.isError |
Jordan Harband |
Jordan Harband |
-2025‑05
-2024‑12
-2024‑10
-2024‑07
-2024‑06
-2024‑04
-2016‑03
-2015‑11 |
2026 |
Array.fromAsync |
J.S. Choi |
J.S. Choi |
-2025‑05
-2025‑04
-2023‑05
-2022‑09
-2022‑01
-2021‑12
-2021‑10
-2021‑08 |
2026 |
RegExp.escape |
Domenic Denicola
Benjamin Gruenbaum
Jordan Harband |
Jordan Harband
Kevin Gibbons |
-2025‑02
-2024‑07
-2024‑06
-2024‑04
-2024‑02
-2023‑09
-2023‑03
-2021‑01
-2015‑07 |
2025 |
Redeclarable global eval-introduced vars |
Shu-yu Guo |
Shu-yu Guo |
-2025‑02
-2024‑04
-2024‑04 |
2025 |
Float16 on TypedArrays, DataView, Math.f16round |
Leo Balter |
Leo Balter
Kevin Gibbons |
-2025‑02
-2023‑05
-2023‑03
-2017‑05 |
2025 |
Promise.try |
Jordan Harband |
Jordan Harband |
-2024‑10
-2024‑06
-2024‑04
-2024‑02
-2024‑02
-2016‑11 |
2025 |
| Sync Iterator helpers |
Gus Caplan |
Michael Ficarra
Jonathan Keslin
Kevin Gibbons |
-2024‑10
-2024‑12
-2024‑06
-2023‑11
-2023‑11
-2023‑09
-2023‑07
-2023‑05 [2]
-2023‑03
-2023‑01
-2022‑11
-2022‑09
-2022‑07
-2021‑08
-2020‑07
-2020‑06
-2020‑06
-2019‑07
-2019‑01 |
2025 |
| JSON Modules |
Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg |
Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg |
-2024‑10
-2024‑06
-2023‑07
-2021‑01 [2]
-2021‑01
-2020‑11 [2]
-2020‑11
-2020‑09
-2020‑07 |
2025 |
| Import Attributes |
Myles Borins
Sven Sauleau
Dan Clark
Daniel Ehrenberg |
Sven Sauleau
Dan Clark
Daniel Ehrenberg
Nicolò Ribaudo |
-2024‑10
-2024‑07
-2023‑09
-2023‑07
-2023‑03
-2023‑01
-2023‑01
-2021‑07
-2021‑04
-2020‑11
-2020‑09
-2020‑07
-2020‑06 [2]
-2020‑02
-2019‑12 [2] |
2025 |
| RegExp Modifiers |
Ron Buckton |
Ron Buckton |
-2024‑10
-2024‑06
-2023‑11
-2023‑07
-2022‑06
-2021‑12
-2021‑10 |
2025 |
| New Set methods |
Michał Wadas
Sathya Gunasekaran
Kevin Gibbons |
Kevin Gibbons |
-2024‑04
-2024‑02
-2023‑07
-2023‑03
-2022‑11
-2022‑09
-2022‑07
-2019‑01
-2018‑05 |
2025 |
| Duplicate named capture groups |
Kevin Gibbons |
Kevin Gibbons |
-2024‑04
-2023‑07
-2022‑07
-2022‑06 [2]
-2022‑06 |
2025 |
| ArrayBuffer transfer |
Shu-yu Guo
Jordan Harband
Yagiz Nizipli |
Shu-yu Guo
Jordan Harband
Yagiz Nizipli |
-2024‑02
-2023‑01
-2018‑07 |
2024 |
Promise.withResolvers |
Peter Klecha |
Peter Klecha |
-2023‑11
-2023‑07
-2023‑05
-2023‑05
-2023‑03 |
2024 |
| Array Grouping |
Justin Ridgewell |
Justin Ridgewell
Jordan Harband |
-2023‑11
-2023‑09
-2023‑07
-2023‑05
-2022‑11
-2022‑06
-2021‑12
-2021‑10
-2021‑07 |
2024 |
| Resizable and growable ArrayBuffers |
Shu-yu Guo |
Shu-yu Guo |
-2023‑09
-2023‑07
-2022‑03
-2021‑10
-2021‑08
-2021‑05
-2021‑04
-2021‑04
-2021‑03
-2021‑01
-2020‑09
-2020‑07 |
2024 |
| RegExp v flag with set notation + properties of strings |
Markus Scherer
Mathias Bynens |
Mathias Bynens |
-2023‑05
-2022‑03
-2021‑12
-2021‑08
-2021‑05
-2021‑04 |
2024 |
Atomics.waitAsync |
Lars Hansen |
Shu-yu Guo
Lars Hansen |
-2023‑05
-2020‑03
-2019‑12
-2019‑06
-2017‑09 |
2024 |
| Well-Formed Unicode Strings |
Guy Bedford
Bradley Farias |
Guy Bedford
Bradley Farias
Michael Ficarra |
-2023‑05
-2022‑11
-2022‑09 |
2024 |
| Change Array by Copy |
Ashley Claymore
Robin Ricard |
Ashley Claymore
Robin Ricard |
-2023‑01
-2022‑06
-2022‑03
-2022‑07
-2021‑10
-2021‑08
-2021‑04 |
2023 |
| Symbols as WeakMap keys |
Daniel Ehrenberg
Richard Button
Robin Ricard
Leo Balter
Rick Waldron
Caridy Patiño |
Daniel Ehrenberg
Richard Button
Robin Ricard
Leo Balter
Rick Waldron
Caridy Patiño |
-2023‑01
-2022‑06
-2022‑01
-2022‑01
-2021‑05
-2021‑04
-2020‑07
-2020‑06 |
2023 |
| Hashbang Grammar |
Bradley Farias |
Bradley Farias |
-2022‑07
-2020‑03
-2018‑03 |
2023 |
| Array find from last |
Wenlu Wang |
Wenlu Wang
Daniel Rosenwasser |
-2022‑06
-2021‑07
-2021‑03
-2021‑01 |
2023 |
| Error Cause |
Chengzhong Wu |
Chengzhong Wu
Hemanth HM |
-2021‑10
-2021‑03
-2020‑11
-2020‑09 |
2022 |
| Class Static Block |
Ron Buckton |
Ron Buckton |
-2021‑08
-2021‑03
-2021‑01
-2020‑09
-2020‑07
-2018‑05 |
2022 |
Accessible Object.prototype.hasOwnProperty |
Jamie Kyle |
Tierney Cyren
Jamie Kyle |
-2021‑08
-2021‑07
-2021‑05 |
2022 |
.at() |
Shu-yu Guo
Tab Atkins |
Shu-yu Guo
Tab Atkins |
-2021‑08
-2021‑01
-2020‑11
-2020‑09 |
2022 |
| Ergonomic brand checks for Private Fields |
Jordan Harband |
Jordan Harband |
-2021‑07
-2021‑01
-2020‑09
-2020‑09
-2020‑07
-2020‑06
-2020‑03 |
2022 |
Top-level await |
Myles Borins
Yulia Startsev
Daniel Ehrenberg
Guy Bedford
Ms2ger |
Myles Borins
Yulia Startsev |
-2021‑05
-2021‑03
-2019‑10
-2019‑06
-2019‑03
-2018‑05 |
2022 |
| RegExp Match Indices |
Ron Buckton |
Ron Buckton |
-2021‑05
-2021‑01
-2020‑11
-2019‑12
-2019‑10
-2019‑07
-2018‑07
-2018‑05 |
2022 |
| Class Fields (Private instance methods and accessors, Class Public Instance Fields & Private Instance Fields, Static class fields and private static methods) |
Daniel Ehrenberg |
Daniel Ehrenberg
Kevin Gibbons |
-2021‑04
-2020‑09
-2018‑09
-2018‑05
-2018‑05
-2018‑01
-2017‑11
-2017‑11
-2017‑11
-2017‑09
-2017‑09
-2017‑07
-2017‑07
-2017‑01
-2016‑07
-2016‑03 |
2022 |
| Numeric separators |
Sam Goto
Rick Waldron |
Sam Goto
Rick Waldron
Leo Balter |
-2020‑07
-2020‑07
-2019‑03
-2019‑01
-2018‑05
-2017‑11
-2017‑09
-2017‑07 |
2021 |
| Logical Assignment Operators |
Justin Ridgewell |
Justin Ridgewell
Hemanth HM |
-2020‑07
-2020‑03
-2020‑02
-2020‑02
-2018‑03
-2018‑03 |
2021 |
| WeakRefs |
Dean Tribble
Sathya Gunasekaran |
Dean Tribble
Mark Miller
Till Schneidereit
Sathya Gunasekaran
Daniel Ehrenberg |
-2020‑07
-2020‑03
-2020‑03
-2020‑02
-2020‑02
-2019‑06
-2019‑03
-2018‑11
-2018‑03
-2016‑03 |
2021 |
Promise.any |
Mathias Bynens
Kevin Gibbons
Sergey Rubanov |
Mathias Bynens |
-2020‑07
-2020‑06
-2019‑10
-2019‑07
-2019‑06
-2019‑03 |
2021 |
String.prototype.replaceAll |
Peter Marshall
Jakob Gruber
Mathias Bynens |
Mathias Bynens |
-2020‑06
-2019‑10
-2019‑07
-2019‑03
-2017‑11 |
2021 |
import.meta |
Domenic Denicola |
Gus Caplan |
-2020‑03
-2020‑03
-2017‑09
-2017‑09
-2017‑05 |
2020 |
| Nullish coalescing Operator |
Gabriel Isenberg |
Gabriel Isenberg
Justin Ridgewell
Daniel Rosenwasser |
-2019‑12
-2019‑07
-2019‑06
-2018‑03
-2017‑09 |
2020 |
| Optional Chaining |
Gabriel Isenberg
Claude Pache
Dustin Savery |
Gabriel Isenberg
Dustin Savery
Justin Ridgewell
Daniel Rosenwasser |
-2019‑12
-2019‑07
-2019‑06
-2018‑11
-2018‑11
-2018‑03
-2018‑01
-2017‑09 |
2020 |
for-in mechanics |
Kevin Gibbons |
Kevin Gibbons |
-2019‑12
-2019‑06
-2018‑09 |
2020 |
globalThis |
Jordan Harband |
Jordan Harband |
-2019‑10
-2019‑01
-2018‑07
-2018‑07
-2016‑07 |
2020 |
Promise.allSettled |
Jason Williams
Robert Pamely
Mathias Bynens |
Mathias Bynens |
-2019‑07
-2019‑03
-2019‑01
-2018‑09 |
2020 |
BigInt |
Daniel Ehrenberg |
Daniel Ehrenberg |
-2019‑07
-2019‑06
-2019‑03
-2019‑03
-2019‑01
-2018‑05
-2018‑03
-2018‑01
-2017‑11
-2017‑09
-2017‑09
-2017‑07
-2017‑05
-2017‑05 |
2020 |
import() |
Domenic Denicola |
Domenic Denicola |
-2019‑07
-2019‑06
-2019‑03
-2016‑11
-2016‑11
-2016‑09 |
2020 |
String.prototype.matchAll |
Jordan Harband |
Jordan Harband |
-2019‑03
-2018‑09
-2018‑05
-2018‑01
-2017‑09
-2017‑09 |
2020 |
Array.prototype.{flat,flatMap} |
Brian Terlson
Michael Ficarra
Mathias Bynens |
Brian Terlson
Michael Ficarra |
-2019‑01
-2018‑09
-2018‑05
-2018‑03
-2018‑03
-2017‑11
-2017‑09
-2017‑07 |
2019 |
String.prototype.{trimStart,trimEnd} |
Sebastian Markbåge |
Sebastian Markbåge
Mathias Bynens |
-2019‑01
-2018‑01 |
2019 |
Well-formed JSON.stringify |
Richard Gibson |
Mathias Bynens |
-2019‑01
-2018‑09
-2018‑05 |
2019 |
Object.fromEntries |
Darien Maillet Valentine |
Jordan Harband
Kevin Gibbons |
-2019‑01
-2018‑07
-2018‑05
-2018‑03 |
2019 |
Function.prototype.toString revision |
Michael Ficarra |
Michael Ficarra |
-2018‑11
-2018‑09
-2018‑05
-2018‑01
-2017‑07
-2016‑11
-2016‑03
-2016‑03
-2015‑05 |
2019 |
Symbol.prototype.description |
Michael Ficarra |
Michael Ficarra |
-2018‑11
-2018‑05
-2018‑01
-2017‑07 |
2019 |
| JSON superset |
Richard Gibson |
Mark Miller
Mathias Bynens |
-2018‑05
-2018‑01
-2017‑11
-2017‑09 |
2019 |
Optional catch binding |
Michael Ficarra |
Michael Ficarra |
-2018‑05
-2017‑07 |
2019 |
| Asynchronous Iteration |
Domenic Denicola |
Domenic Denicola |
-2018‑01
-2017‑05
-2016‑09 |
2018 |
Promise.prototype.finally |
Jordan Harband |
Jordan Harband |
-2021‑12
-2018‑01
-2018‑01
-2017‑09
-2017‑07
-2017‑01
-2016‑11
-2016‑07 |
2018 |
| RegExp Unicode Property Escapes |
Mathias Bynens |
Brian Terlson
Daniel Ehrenberg
Mathias Bynens |
-2018‑01
-2017‑05
-2017‑03
-2016‑07 |
2018 |
| RegExp Lookbehind Assertions |
Gorkem Yakin
Nozomu Katō
Daniel Ehrenberg |
Daniel Ehrenberg
Mathias Bynens |
-2018‑03
-2018‑01
-2018‑01
-2017‑03
-2016‑11 |
2018 |
| Rest/Spread Properties |
Sebastian Markbåge |
Sebastian Markbåge |
-2018‑01
-2016‑09
-2015‑09
-2015‑07
-2014‑09
-2014‑06 |
2018 |
| RegExp named capture groups |
Gorkem Yakin
Daniel Ehrenberg |
Daniel Ehrenberg
Brian Terlson
Mathias Bynens |
-2017‑11
-2017‑05 |
2018 |
s (dotAll) flag for regular expressions |
Mathias Bynens |
Brian Terlson
Mathias Bynens |
-2017‑11
-2017‑05 |
2018 |
| Lifting template literal restriction |
Tim Disney |
Tim Disney |
-2017‑03 |
2018 |
| Shared memory and atomics |
Lars T Hansen |
Lars T Hansen |
-2017‑01
-2016‑07
-2016‑03
-2016‑01
-2015‑09 |
2017 |
| Async functions |
Brian Terlson |
Brian Terlson |
-2016‑07
-2016‑07
-2015‑09
-2015‑07 |
2017 |
| Trailing commas in function parameter lists and calls |
Jeff Morrison |
Jeff Morrison |
-2016‑07
-2015‑11
-2015‑09
-2014‑09
-2014‑09 |
2017 |
Object.getOwnPropertyDescriptors |
Jordan Harband
Andrea Giammarchi |
Jordan Harband |
-2016‑07
-2016‑05
-2016‑03
-2016‑01
-2016‑01
-2014‑04 |
2017 |
| String padding |
Jordan Harband |
Jordan Harband
Rick Waldron |
-2016‑05 |
2017 |
Object.values/Object.entries |
Jordan Harband |
Jordan Harband |
-2016‑03
-2016‑01
-2015‑11
-2015‑09
-2014‑04 |
2017 |
| Exponentiation operator |
Rick Waldron |
Rick Waldron |
-2016‑01
-2015‑09
-2015‑09
-2015‑07
-2014‑09
-2014‑07 |
2016 |
Array.prototype.includes |
Domenic Denicola |
Domenic Denicola
Rick Waldron |
-2015‑11
-2015‑07
-2014‑11
-2014‑07
-2014‑04 |
2016 |
