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RE: Browsers and ECMAscript editions

From: Leonard Rosenthol <lrosenth@adobe.com>
Date: Mon, 12 Jul 2010 10:47:56 -0700
To: "'Oliver Hunt'" <oliver@apple.com>, Chris Lilley <chris@w3.org>
CC: SVG Working Group WG <public-svg-wg@w3.org>
Message-ID: <D23D6B9E57D654429A9AB6918CACEAA97D22B40E05@NAMBX02.corp.adobe.com>
The other related issue is where E4X (ECMA-357) comes in...

Leonard

From: public-svg-wg-request@w3.org [mailto:public-svg-wg-request@w3.org] On Behalf Of Oliver Hunt
Sent: Monday, July 12, 2010 1:08 PM
To: Chris Lilley
Cc: SVG Working Group WG
Subject: Re: Browsers and ECMAscript editions

Broadly speaking all of the major browsers are moving towards support for ES5, however much like HTML5 support comes in gradually over time -- a number of engines supported features that became part of ES5 years ago, some features have are supported only in the most recent releases, and some features are still some way off.

That said from the PoV of a spec there isn't a substantial change in language semantics between ES3 and ES5, the only real difference is the change in property attribute terminology:
ES3           ES5
DontEnum      enumerable
ReadOnly      writable
DontDelete    configurable

The basic difference is that the meanings are reversed, eg. DontEnum == !enumerable

But even these terms i think only really matter to the WebIDL spec -- the WebIDL spec provides the wrapper that most DOM related specs seem to use in defining behaviour.

--Oliver

On Jul 12, 2010, at 9:50 AM, Chris Lilley wrote:


On Monday, July 12, 2010, 4:19:06 PM, Chris wrote:

CL> Hello,

CL> Mohamed has asked us to link to ECMAScript 5th Edition of
CL> December 2009. We aren't sure what edition is actually implemented
CL> in browsers, and other SVG implementors.

CL> Comments by implementors would help here.

Mozilla  seems to be proceeding with ECMAScript 5th edition (1.5)
https://developer.mozilla.org/En/JavaScript/ECMAScript_5_support_in_Mozilla

Webkit also
http://labs.trolltech.com/blogs/2010/01/15/ecmascript-5-and-webkitjavascriptcore/

Opera has partial support and 'will support it once finalized'
http://www.opera.com/docs/specs/presto25/#ecmascript

Its not clear whether Mozilla Rhino
http://www.mozilla.org/rhino/
and thus other engines which use Rhino, such as Batik
http://xmlgraphics.apache.org/batik/using/scripting/ecmascript.html
are on ECMAScript 5.

A bugzilla bug indicates that it is requested, and may be underway
https://bugzilla.mozilla.org/show_bug.cgi?id=489326
https://developer.mozilla.org/en/Rhino_Wish_List#Implement_ECMAScript_edition_5


CL> ISSUE-2344
CL> ACTION-2821





--
Chris Lilley                    mailto:chris@w3.org
Technical Director, Interaction Domain
W3C Graphics Activity Lead
Co-Chair, W3C Hypertext CG
Received on Monday, 12 July 2010 17:48:42 UTC

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