How to use <select selected="default"> as default for items?

[unhammer]

docs say

 	array 	[]
items 	An array of the initial selected values. By default this is populated from the original input element.

items: ["opt1"]

Does that mean it should be possible to initialize this from html, e.g. <select selected="foo"> where we have <option value="foo">Fooworthiness</option>

(I can't get that to work, it just seems to pick the stay with the first <option> in the list.)