DISPATCH M. Borins
Internet-Draft M. Bynens
Updates: 4329 (if approved) Google
Intended status: Informational M. Miller
Expires: December 21, 2019 Mozilla
B. Farias
June 19, 2019
ECMAScript Media Types Updates
draft-ietf-dispatch-javascript-mjs-04
Abstract
This document proposes updates to the ECMAScript media types,
superseding the existing registrations for "application/javascript"
and "text/javascript" by adding an additional extension and removing
usage warnings. This document updates RFC4329, "Scripting Media
Types".
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 21, 2019.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
3.1. Common Javascript Media Types . . . . . . . . . . . . . . 3
3.1.1. text/javascript . . . . . . . . . . . . . . . . . . . 3
3.2. Historic Javascript Media Types . . . . . . . . . . . . . 4
3.2.1. application/ecmascript . . . . . . . . . . . . . . . 4
3.2.2. application/javascript . . . . . . . . . . . . . . . 5
3.2.3. application/x-ecmascript . . . . . . . . . . . . . . 6
3.2.4. application/x-javascript . . . . . . . . . . . . . . 7
3.2.5. text/ecmascript . . . . . . . . . . . . . . . . . . . 8
3.2.6. text/javascript1.0 . . . . . . . . . . . . . . . . . 9
3.2.7. text/javascript1.1 . . . . . . . . . . . . . . . . . 10
3.2.8. text/javascript1.2 . . . . . . . . . . . . . . . . . 11
3.2.9. text/javascript1.3 . . . . . . . . . . . . . . . . . 12
3.2.10. text/javascript1.4 . . . . . . . . . . . . . . . . . 13
3.2.11. text/javascript1.5 . . . . . . . . . . . . . . . . . 14
3.2.12. text/jscript . . . . . . . . . . . . . . . . . . . . 15
3.2.13. text/livescript . . . . . . . . . . . . . . . . . . . 16
3.2.14. text/x-ecmascript . . . . . . . . . . . . . . . . . . 17
3.2.15. text/x-javascript . . . . . . . . . . . . . . . . . . 18
4. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1. Normative References . . . . . . . . . . . . . . . . . . 19
4.2. Informative References . . . . . . . . . . . . . . . . . 19
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
1. Introduction
This document updates the existing media types for the ECMAScript
programming language. It supersedes the media types registrations in
[RFC4329] for "application/javascript" and "text/javascript".
2. Background
In order to formalize support for modular programs [ECMA-262] now
defines two top-level goal symbols for the ECMAScript grammar. This
means that (in the absence of additional information) there are two
possible interpretations for any given ECMAScript Source Text. The
TC39 standards body for ECMAScript has determined that media types
are outside of their scope of work [TC39-MIME-ISSUE].
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It is not possible to fully determine if a Source Text of ECMAScript
is meant to be parsed in the Module or Script grammar goals based
upon content alone. Therefore, scripting environments must use out
of band information in order to determine what goal a Source Text
should be treated as. To this end some scripting environments have
chosen to adopt a new file extension of .mjs for determining the goal
of a given Source Text.
3. IANA Considerations
The media type registrations herein are divided into two major
categories: the sole media type "text/javascript" which is now in
common usage, and all of the media types that are obsolete.
For both categories, The ECMAScript media types are to be updated to
point to a non-vendor specific standard undated specification of
ECMAScript. In addition, a new file extension of .mjs is to be added
to the list of file extensions with the restriction that it must
correspond to the Module grammar of [ECMA-262]. Finally, the [HTML]
specification is using "text/javascript" as the default media type of
ECMAScript when preparing script tags; therefore, "text/javascript"
has been moved intended usage from OBSOLETE to COMMON.
3.1. Common Javascript Media Types
3.1.1. text/javascript
Type name: text
Subtype name: javascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
Applications which use this media type: Script interpreters as
discussed in [RFC4329].
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Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: COMMON
Restrictions on usage: The .mjs file extension signals that the file
represents a JavaScript module. Execution environments that rely
on file extensions to determine how to process inputs parse .mjs
files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2. Historic Javascript Media Types
The following media types are added or updated for historical
purposes. All herein have an intended usage of OBSOLETE, and are not
expected to be in use with modern implementations.
3.2.1. application/ecmascript
Type name: application
Subtype name: ecmascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .es, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.2. application/javascript
Type name: application
Subtype name: javascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>.
3.2.3. application/x-ecmascript
Type name: application
Subtype name: x-ecmascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .es, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.4. application/x-javascript
Type name: application
Subtype name: x-javascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.5. text/ecmascript
Type name: text
Subtype name: ecmascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .es, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.6. text/javascript1.0
Type name: text
Subtype name: javascript1.0
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.7. text/javascript1.1
Type name: text
Subtype name: javascript1.1
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.8. text/javascript1.2
Type name: text
Subtype name: javascript1.2
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.9. text/javascript1.3
Type name: text
Subtype name: javascript1.3
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.10. text/javascript1.4
Type name: text
Subtype name: javascript1.4
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.11. text/javascript1.5
Type name: text
Subtype name: javascript1.5
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: This media type is obsolete; current
implementations should use text/javascript as the only JavaScript/
ECMAScript media type. The .mjs file extension signals that the
file represents a JavaScript module. Execution environments that
rely on file extensions to determine how to process inputs parse
.mjs files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.12. text/jscript
Type name: text
Subtype name: jscript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
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Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: The .mjs file extension signals that the file
represents a JavaScript module. Execution environments that rely
on file extensions to determine how to process inputs parse .mjs
files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.13. text/livescript
Type name: text
Subtype name: livescript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
Applications which use this media type: Script interpreters as
discussed in [RFC4329].
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Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: The .mjs file extension signals that the file
represents a JavaScript module. Execution environments that rely
on file extensions to determine how to process inputs parse .mjs
files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.14. text/x-ecmascript
Type name: text
Subtype name: x-ecmascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
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Magic number(s): n/a
File extension(s): .es, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: The .mjs file extension signals that the file
represents a JavaScript module. Execution environments that rely
on file extensions to determine how to process inputs parse .mjs
files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
3.2.15. text/x-javascript
Type name: text
Subtype name: x-javascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: Encoding is host dependent with differences
in byte order marks, the charset parameter, and text
preprocessing.
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329].
Published specification: [[RFCXXXX]]
Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
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File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: OBSOLETE
Restrictions on usage: The .mjs file extension signals that the file
represents a JavaScript module. Execution environments that rely
on file extensions to determine how to process inputs parse .mjs
files using the Module grammar of [ECMA-262].
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
4. References
4.1. Normative References
[ECMA-262]
Ecma International, "Standard ECMA-262: ECMAScript
Language Specification", August 2017, <https://ecma-
international.org/publications/standards/Ecma-262.htm>.
[RFC4329] Hoehrmann, B., "Scripting Media Types", RFC 4329,
DOI 10.17487/RFC4329, April 2006,
<https://www.rfc-editor.org/info/rfc4329>.
4.2. Informative References
[HTML] WHATWG, "HTML Living Standard", August 2017,
<https://html.spec.whatwg.org/multipage/
scripting.html#prepare-a-script>.
[TC39-MIME-ISSUE]
TC39, "Add `application/javascript+module` mime to remove
ambiguity", August 2017, <https://web.archive.org/web/2017
0814193912/https://github.com/tc39/ecma262/issues/322>.
Appendix A. Acknowledgements
The authors would like to thank Suresh Krishnan, Alexey Melnikov,
Mark Nottingham, James Snell, Adam Roach, and Allen Wirfs-Brock for
their guidance throughout this process.
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Authors' Addresses
Myles Borins
Google
Email: mylesborins@google.com
Mathias Bynens
Google
Email: mths@google.com
Matthew A. Miller
Mozilla
Email: linuxwolf+ietf@outer-planes.net
Bradley Farias
Email: bradley.meck@gmail.com
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