On Jun 6, 2013, at 4:51 AM, François REMY wrote:

>> The sentence
>> 
>>     If a key is duplicated, a parser SHOULD reject.
>> 
>> is not a change. It is implied by the first statement.
> 
> I do not agree. A 'should' authoring requirement is not meant to trigger an 
> abortion from the execution engine.
> 
> For example, the CSS flexbox spec says that an author should not use the CSS 
> 'order' property to convey any semantic meaning, but that doesn't mean the 
> browser will reject the 'order' declaration if it detects the way it's used 
> is not semantically valid. A 'should' is nothing more than an advice to the 
> author, not a requirement per se. 

+1

Allen
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