W3C home > Mailing lists > Public > www-html@w3.org > January 2001

Re: Add Version Information to Script Element

From: Robin Lionheart <lionheart@robinlionheart.com>
Date: Wed, 3 Jan 2001 20:26:11 -0500 (EST)
Message-ID: <04bf01c075ed$406abd90$9379add1@RobinsNest>
To: "Axel Dahmen" <a.dahmen@infozoom.de>, <www-html@w3.org>

----- Original Message -----
From: "Axel Dahmen" <a.dahmen@infozoom.de>
To: <www-html@w3.org>
Sent: Tuesday, 19 December, 2000 4:01 PM
Subject: RFC: Add Version Information to Script Element

> Hi,
> IMHO, using the "type" attribute to set both the language and the required
> version number is not a clean
> solution. Browser applications need to hard-code which language and
> they support from a one-dimensional
> list of supported scripting languages.
> Thus, I'd like to suggest to add a "version" attribute to the script
> element...
>     <!ATTLIST script version CDATA -- absolute decimal number -->

Don't confuse version numbers with decimal numbers. User agents might well
want to ignore subversion numbers below a certain level, so a user agent
supporting WidgetScript 4.1 might execute WidgetScript scripts.

> ...and to other elements dealing with scripting, like the meta tag:
>     <meta http-equiv="Content-Script-Version" content="1.3">
> This would yield much cleaner implementations of version checking.
> What's your oppinion?

If it is important to express the version number of a scripting language, it
seems to me the appropriate way to do it would be by using attributes on the
MIME media type, such as:

<script type="application/x-javascript;version=1.3">

Web servers could also set this on the HTTP Content-Type: header, allowing
alternate files with different versions to be selected in content
Received on Wednesday, 3 January 2001 20:39:06 UTC

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