W3C home > Mailing lists > Public > public-html@w3.org > June 2009

Re: Case-sensitivity of attribute values wrt Selectors

From: Ian Hickson <ian@hixie.ch>
Date: Thu, 25 Jun 2009 07:45:44 +0000 (UTC)
To: Simon Pieters <simonp@opera.com>
Cc: public-html <public-html@w3.org>, Niels Leenheer <niels.leenheer@gmail.com>
Message-ID: <Pine.LNX.4.62.0906250731590.1648@hixie.dreamhostps.com>
On Sat, 5 Jan 2008, Simon Pieters wrote:
> HTML 5 should define which attribute values should be treated 
> case-insensitively with regards to Selectors, and whether that's ASCII 
> case-insensitively or Unicode case-insensitively.
> I tested what browsers do:
>    http://simon.html5.org/test/selectors/case-sensitivity/
> IE7 treats all attribute values case-sensitively.
> When the document is served as XML, all attribute values are case-sensitive in
> Opera, Firefox and Safari.
> When the document is served as text/html:
> In Opera, for any HTML element, a given set of attributes (see below) are
> treated Unicode case-insensitively.
> In Firefox, for any element (including non-HTML elements), a given set of
> attributes (see below) are treated Unicode case-insensitively.
> In Safari, for any element (including non-HTML elements), all attributes are
> treated ASCII case-insensitively.
> The set of attributes is (assuming I haven't missed some attribute to test):
> accept, charset, disabled, align, alink, axis, bgcolor, charset, clear,
> codetype, color, compact, declare, defer, dir, disabled, enctype, face, frame,
> hreflang, http-equiv, ismap (missing in Firefox), language, link, media,
> method, multiple, noresize, noshade, nowrap, readonly, rel, rev, rules, scope,
> scrolling, selected, shape, target, text, type, valign (missing in Opera),
> valuetype, vlink.
> Also see: http://rakaz.nl/item/css_selector_bugs_case_sensitivity
> Personally, I think that whether the document was served as XML or 
> text/html shouldn't matter here, and that the same set of attributes 
> should be treated case-insensitively for both HTML and XHTML. Moreover, 
> I think the set of attributes should only apply for elements in the HTML 
> namespace (like in Opera). I don't mind that the set of attributes 
> applies to all elements in the HTML namespace.

I've updated the spec to match Mozilla and Safari (which has changed from 
above; see below) in terms of the list of attributes, and to require ASCII 

On Tue, 8 Jan 2008, Simon Pieters wrote:
> It seems that WebKit now has the same set of attributes as Mozilla, 
> treats them ASCII case-insensitively for HTML elements and only in 
> text/html. Now add ismap='' to that list and make it behave the same in 
> application/xhtml+xml... :-)

I've left XML be case-sensitive.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Thursday, 25 June 2009 07:46:19 UTC

This archive was generated by hypermail 2.4.0 : Saturday, 9 October 2021 18:44:49 UTC