[css3-ui] nav-index <number> value

in [1], it says:
nav-index: auto | <number> | inherit
Then
<<
<number>
     The number (which is non-zero and positive) indicates the sequential
     navigation order for the element. '1' means first. Elements with the
     same nav-index value are navigated in document order when that
     nav-index value is being navigated.
>>
If the first number non-zero and positive is '1', then the value is 
probably <integer> and not a <number>.
Cheers,

[1] http://www.w3.org/TR/2012/WD-css3-ui-20120117/#nav-index0

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         ~~Yves