srcset Attribute

I am mulling over the srcset attribute, which for many developers in 
responsive design is the answer to a prayer.

However, there is one part of the specification which has me befuddled:

 An image candidate string consists of the following components, in order, with the further restrictions described below this list:

 …

 Zero or one of the following:

          A width descriptor, …

  A pixel density descriptor, …

As far as I can tell, this means that you can specify the width or the 
density, but not both. I cannot see the benefit of this restriction, and 
I can suggest that it renders the specification less than complete.

For example, four candidate devices: an old iPhone, a newer (retina 
screen) iPhone, and older MacBook, a newer (retina screen) MacBook. It 
seems that it is not possible to distinguish between all four devices 
individually, and so one or more of them will need to render a 
non-optimal image.

I would like to propose an amendment to  the specification to read:

 Zero*, one or two*  of the following:

This would allow the specification of both the width and the density, 
and allow the developer more flexibility in responding to various screen 
properties.

Best Regards,

Mark

-- 


  Mark Simon

Manngo Net Pty Ltd

mobile:0411 246 672

email:mark@manngo.net <mailto:mark@comparity.net> web:http://www.manngo.net

Resume:http://mark.manngo.net