Stas Bekman wrote:

>Geoffrey Young wrote:
>  
>
>>>Since when unescaped & in the QUERY_STRING part of the URL are not allowed?
>>>      
>>>
>>I dunno the specifics, but if you try using the w3c validator you end up
>>with something like this
>>
>>  reference not terminated by REFC delimiter
>>
>>  <a href="http://example.com/foo.pl?foo=bar&reg=foobar";>is this valid?</a>
>>
>>  If you meant to include an entity that starts with "&", then you should
>>  terminate it with ";". Another reason for this error message is that you
>>  inadvertently created an entity by failing to escape an "&" character just
>>  before this text.
>>
>>I swear last time I checked my own html there was a pointer to the
>>appropriate rfc, but I guess not.
>>    
>>
>
>OK, in which case it must be some relatively recent change, since an 
>unescaped & in the QUERY_STRING was a valid separator. A pointer to the 
>relevant RFC would be nice so we can add that to the URL that started this 
>thread.
>
Here?

http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.2.2



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