[whatwg] Modal dialogs in HTML5

[Martin Atkins]

Philipp Serafin wrote:
> timeless schrieb:
>> On Thu, Dec 25, 2008 at 8:29 PM, Philipp Serafin <phil127 at gmail.com> 
>> wrote:
>>  
>>> Well, you could still phrase it something along the lines of "The 
>>> size of a
>>> popup document's viewport SHOULD be calculated using the CSS shrink wrap
>>> algorithm... etc etc".
>>>     
>>
>> as an embedder of a browser for a small device, i do *not* want such a
>> requirement
>>   
> Hence why it would be a SHOULD and not a MUST.
> 
> RFC 2119:  "This word [...] mean[s] that there may exist valid reasons 
> in particular circumstances to ignore a particular item [...]"
> 

If the spec author knows the "valid reasons", though, I would argue that 
it's better for interop to just spell out the situations where the 
requirement doesn't apply, rather than assume that implementors will 
ignore a particular requirement.