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Re: Legacy Doctype and Doctype Versioning

From: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Date: Wed, 17 Feb 2010 15:35:36 +0100
To: Maciej Stachowiak <mjs@apple.com>
Cc: Philip Taylor <pjt47@cam.ac.uk>, Julian Reschke <julian.reschke@gmx.de>, Lachlan Hunt <lachlan.hunt@lachy.id.au>, "public-html@w3.org" <public-html@w3.org>
Message-ID: <20100217153536614327.323d51f3@xn--mlform-iua.no>
Leif Halvard Silli, Wed, 17 Feb 2010 14:30:33 +0100:
> Maciej Stachowiak, Wed, 17 Feb 2010 05:26:40 -0800:
>> On Feb 17, 2010, at 5:17 AM, Leif Halvard Silli wrote:
>> 
>>> Philip Taylor, Wed, 17 Feb 2010 09:29:43 +0000:
>>>> Julian Reschke wrote:
>>>>> On 17.02.2010 10:08, Lachlan Hunt wrote:
>>>>>> Leif Halvard Silli wrote:
>>>>>>> Not in Safari 4. In the current version of Safari, this variant of the
>>>>>>> strict Doctype triggers QuirksMode:
>>>>>>> 
>>>>>>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
>>>>>>> [<!ATTLIST P myattr CDATA #implied>]>
>>>>>> 
>>>>>> This is a bogus DOCTYPE in HTML5 because there is no support for 
>>>>>> parsing
>>>>>> the SGML syntax for the internal subset in the HTML 
>>>>>> serialisation. [...]
>>>>> 
>>>>> ...just trying to understand... a DOCTYPE that previously triggered
>>>>> standards mode will now (as in FF trunk + HTML5 parser) get you to
>>>>> Quirks mode?
>>>> 
>>>> Yes, but in pre-HTML5 browsers (IE, Firefox 3.6 without html5.enable,
>>>> etc) doctypes will still only be parsed up to the *first* ">", so you
>>>> will get the characters "]>" inserted as text into the body of the
>>>> document, so today you can't use internal subsets in text/html anyway.
>>> 
>>> Firefox and IE do indeed show the "]>". Opera and Konqueror do not.
>>> Safari 4 does show it, but since Konqueror does not, then I don't trust
>>> that this is a "honest" display. As this test page shows:
>>> http://www.målform.no/html4-or-html5/

>> 
>> What do you mean by "honest"? WebKit forked from KHTML years ago. One 
>> of the earliest things rewritten was the doctype parsing code, where 
>> we did our best to copy Gecko. It's not at all surprising that the 
>> behavior is different.
> 
> If that is so, then it of course sounds likely that it is an old issue. 
> However, if you have copied Firefox so well, then it has to be a new 
> that it triggers QuirksMode. Because it does not in released Firefox.

This issue now has a bug

http://www.w3.org/Bugs/Public/show_bug.cgi?id=9052

-- 
leif halvard silli
Received on Wednesday, 17 February 2010 14:36:12 GMT

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