Accept matching alternate spelling when only one option left on loosing focus

[drasive]

If I enter an alternative spelling into a textbox and use the mouse to focus on a different element afterwards, the input is rejected, even when the input exactly matched an alternative spelling and only one element was left to be selected.
I would expect the input to be accepted in this case.

Example (month input from 1 to 12)

1. I enter "5", a single option (05) is presented
   
2. I use the mouse to focus on a different element. The input is rejected, even though there was only a single available element and my input exactly matched an alternative spelling
   

HTML

<option disabled selected>Month</option>
<option value="1" data-alternative-spellings="1 January Jan.">01</option>
<option value="2" data-alternative-spellings="2 February Feb.">02</option>
..

[brandoncarl]

This is the intended behavior. If no selection is actually made then results are ignored. The same thing happens with Facebook, Twitter, etc.