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Re: [CSS21] Please make the BOM take highest precedence for character encoding information for text/css (higher than HTTP)

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Fri, 19 Oct 2012 11:04:22 -0700
Message-ID: <CAAWBYDBhq4A6dz_-nLHoA07cd6KkvR2ZHOCsM+QrAVHOY8XQ5g@mail.gmail.com>
To: Henri Sivonen <hsivonen@iki.fi>
Cc: www-style@w3.org
On Fri, Oct 19, 2012 at 5:38 AM, Henri Sivonen <hsivonen@iki.fi> wrote:
> Regarding: http://www.w3.org/TR/CSS21/syndata.html#charset
>
> Letting HTTP-level character encoding information take precedence over
> a BOM never leads to sensible results, because the bytes that a BOM
> consists of never occurred for non-BOM purposes at the start of a
> file. So far, it seems that making the BOM override HTTP for HTML and
> JavaScript makes a Web engine more Web-compatible. The BOM overrides
> HTTP for HTML in IE up to and including 9 (but not 10), in Chrome and
> in Opera. The BOM overrides HTTP for JS in IE7 (but not in 8, 9 or
> 10), in Chrome and in Opera.
>
> While I am unaware of Web compat evidence for CSS, it would make CSS
> more consistent with the rest of the platform to make the BOM take the
> highest precedence for CSS as well. Opera and Chrome already give the
> BOM the highest precedence for CSS.
>
> I did not test Safari.
>
> Please change CSS to give the highest precedence to the BOM (UTF-8,
> UTF-16 little endian or UTF-16 big endian).
>
> Gecko bug for the CSS case:
> https://bugzilla.mozilla.org/show_bug.cgi?id=796882
>
> Gecko bug for the JavaScript case:
> https://bugzilla.mozilla.org/show_bug.cgi?id=687859
>
> Gecko bug for the HTML and XML case:
> https://bugzilla.mozilla.org/show_bug.cgi?id=716579
>
> Spec bug for the JavaScript case:
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=19623
>
> Spec bug for the HTML case:
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=17810
>
> Test case for HTML:
> http://hsivonen.iki.fi/test/moz/bom/html.html1251
>
> Test case for CSS and JS:
> http://hsivonen.iki.fi/test/moz/bom/no-charset-attribute.html1251
> (Check baseline for :after support:
> http://hsivonen.iki.fi/test/moz/bom/baseline.html )

I'm okay with this.  I'd really appreciate it if someone could do some
comprehensive testing (I could do it, but others know the problem
space better, and can do the tests faster and more thoroughly than I
can), but in the absence of that, I'm fine with making this change to
the Syntax ED.

~TJ
Received on Friday, 19 October 2012 18:05:16 GMT

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