[whatwg] additional key attribute in form field

[Alexander]

  The simple name/value pairs that form submission is organized in are  
  sufficient for expressing data structures of any complexity.  
  Multidimensional keys like (name, key) in your example can be expressed  
  through combined names:

  <input type="text" name="quantity:{id_value_here}" value="">

Of course, it's how I usually do this :) But I would not be against some common specified approach - especially taking into consideration some restriction on 'name' symbolset (there are much less restrictions on 'value' symbolset)
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