[whatwg] HTML syntax: comments before doctype and doctype sniffing
Ian Hickson
ian at hixie.ch
Mon Jun 18 14:40:30 PDT 2007
On Mon, 18 Jun 2007, Philip Taylor wrote:
>
> In Firefox 2:
>
> javascript:s='<?>';for(i=0;i<1006;++i)s+='
> ';window.location='data:text/html,'+s+'<!doctype
> html><script>document.write(document.compatMode)</script>'
>
> javascript:s='<?>';for(i=0;i<1007;++i)s+='
> ';window.location='data:text/html,'+s+'<!doctype
> html><script>document.write(document.compatMode)</script>'
>
> The first produces CSS1Compat, the second BackCompat. As far as I can
> tell, Firefox requires the doctype to be found when parsing [using
> standards-mode rules] the first 1024 characters (not bytes) from the
> first non-whitespace character, and then it reparses the whole document
> in quirks mode if necessary.
Hm, indeed, how odd. (It doesn't happen if you have purely spaces there,
you need some sort of content there first.) Still, I don't think we should
try to duplicate this unless we have evidence that it really is needed, as
I described in my previous e-mail.
--
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
More information about the whatwg
mailing list