Re: [dispatch] WGLC: draft-ietf-dispatch-javascript-mjs-02.txt

["L. David Baron" <[e-mail]>]

Hi -

I have a few comments on the document:


There are two things that might be read to imply that processors
(e.g., browsers) should change their behavior as a result of file
extensions.  In particular, in section 4 (Registration):

                                                           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].

and then repeatedly in the subsections of that section:

   Restrictions on usage:  The file extension .mjs must be parsed using
      the Module grammar of [ECMA-262] 

This seems like a reasonable thing to suggest as the intended use of
the .mjs extension, but I think it could be read to imply that
implementations should change their behavior as a result of file
extensions, which would be a rather unusual requirement on the Web.

If that requirement were the intent, it would seem to contradict the
processing rules for script elements in the HTML specification at:
https://html.spec.whatwg.org/multipage/scripting.html#attr-script-type
which specify that the type attribute on the script element
determines whether a script is interpreted as a classic script or as
a module script.


Additionally, I wonder whether it would be useful to have a section
that documents the changes from RFC4329.  The introduction to
section 4 (Registration) seems to document some of them, but I
noticed that it doesn't mention that application/ecmascript and
application/javascript have been changed to Obsolete, and a number
of types not previously listed in RFC4329 (but listed in
https://mimesniff.spec.whatwg.org/#javascript-mime-type) have been
added as Obsolete.  (I didn't check for other differences.)


I'm happy to see the obsolete/common distinction in this draft
reflecting current practice.

-David


On Tuesday 2018-07-10 13:15 -0500, Mary Barnes wrote:
> Hi all,
> 
> 
> We would like to start a 2 week WGLC for this document.    If you think the
> document is ready, please respond to this email.  If you have comments that
> you would like considered and/or any editorial suggestions, please post
> those as well.
> 
> 
> The WGLC ends on July 25, 2018.
> 
> 
> Regards,
> 
> Mary
> 
> DISPATCH WG tri-chair
> 
> ---------- Forwarded message ----------
> From: <[e-mail]>;
> Date: Tue, May 8, 2018 at 5:41 PM
> Subject: [dispatch] I-D Action: draft-ietf-dispatch-javascript-mjs-02.txt
> To: [e-mail]
> Cc: [e-mail]
> 
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Dispatch WG of the IETF.
> 
>         Title           : ECMAScript Media Types Updates
>         Authors         : Bradley Farias
>                           Matthew A. Miller
>         Filename        : draft-ietf-dispatch-javascript-mjs-02.txt
>         Pages           : 21
>         Date            : 2018-05-08
> 
> 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".
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-dispatch-javascript-mjs/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-dispatch-javascript-mjs-02
> https://datatracker.ietf.org/doc/html/draft-ietf-dispatch-javascript-mjs-02
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-dispatch-javascript-mjs-02
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
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-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)