Re: [PATCH] gitweb: switch to a modern DOCTYPE

>> While that DOCTYPE is still valid [2], it has several disadvantages:
>> 
>> 1. It’s misleading. The DTD that browsers are supposed to use with that
>>    DOCTYPE has nothing to do with XHTML 1.0 and isn’t available at the URL
>>    that is given [2].
>
> While the WHATWG may claim that, an XML parser is absolutely within its
> rights to refer to and use that DTD, and in fact should do so unless its
> catalog directs it elsewhere.  It may be that some browsers use an
> internal catalog that refers to a different DTD, however.
>
>> diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
>> index 606b50104c..1835487ab2 100755
>> --- a/gitweb/gitweb.perl
>> +++ b/gitweb/gitweb.perl
>> @@ -4219,7 +4219,10 @@ sub git_header_html {
>>  	my $mod_perl_version = $ENV{'MOD_PERL'} ? " $ENV{'MOD_PERL'}" : '';
>>  	print <<EOF;
>>  <?xml version="1.0" encoding="utf-8"?>
>> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
>> +<!DOCTYPE html [
>> +	<!ENTITY nbsp "&#xA0;">
>> +	<!ENTITY sdot "&#x22C5;">
>> +]>
>
> I think this should be fine.  It defines the entities we need and
> appears to be valid XML.  I don't think there should be any problem
> upgrading to XHTML 5 here.